Larson Davis SoundAdvisor Reference Manual

i-1 Larson Davis SoundAdvisor Model 831C Sound Level Meter Reference Manual

i-2 Copyright Copyright 2019, by PCB Piezotronics, Inc. This manual is copyrighted, with all rights reserved. The manual may not be copied in whole or in part for any use without prior written consent of PCB Piezotronics, Inc. Disclaimer The following paragraph does not apply in any state or country where such statements are not agreeable with local law: Even though PCB Piezotronics, Inc. has reviewed its documentation, PCB Piezotronics Inc. makes no warranty or representa- tion, either expressed or implied, with respect to this instrument and documentation, its quality, performance, merchantabil- ity, or fitness for a particular purpose. This documentation is subject to change without notice, and should not be construed as a commitment or representation by PCB Piezotronics, Inc. This publication may contain inaccuracies or typographical errors. PCB Piezotronics, Inc. will periodically update the material for inclusion in new editions. Changes and improvements to the information described in this manual may be made at any time. Safety If the equipment is used in a manner not specified by Larson Davis, the protection provided by the equipment may be impaired. Recycling PCB Piezotronics, Inc. is an environmentally friendly organization and encourages our customers to be environmentally con- scious. When this product reaches its end of life, please recycle the product through a local recycling center or return the prod- uct to: PCB Piezotronics, Inc. Attn: Recycling Coordinator 1681 West 820 North Provo, Utah, USA 84601-1341 where it will be accepted for disposal Warranty For warranty information, refer to our Terms and Conditions of Sale on our website, www.larsondavis.com/TermsConditions.aspx. i.1 Contact Larson Davis Website www.larsondavis.com Worldwide Corporate Headquarters Larson Davis - a PCB Piezotronics division 3425 Walden Avenue Depew, NY 14043-2495 USA Toll-free (in the US): 888-258-3222 Phone: 716-926-8243 USA fax: 716-926-8215 E-mail: [email protected]

Table of Contents Module 1 Model 831C Features 1-1 1.1 Basic Operations 1.2 Applications 1.3 Hardware Features 1.4 Performance Features 1.5 Standard 831C Package Contents 1.6 Options and Accessories Module 2 Instrument Overview 2-1 2.1 Instrument Hardware Overview 2.2 Using the Keypad 2.3 Display Elements Overview Module 3 Getting Started 3-1 3.1 Unpacking & Inspecting 3.2 Connecting the Microphone & Preamplifier 3.3 Connecting the Preamplifier to Meter 3.4 Disconnecting the Preamplifier 3.5 Powering the 831C SLM 3.6 Powering On or Off 3.7 Operating the 831C Remotely 3.8 Long Term Storage of 831C Module 4 Using the Data Display 4-1 4.1 Understanding the Live Tab 4.2 Understanding the Overall Tab 4.3 Understanding the Session Log Tab 4.4 Adjusting the Graph Scale 4.5 Enabling or Disabling Display Tabs Module 5 Calibrating Your SoundAdvisor 831C 5-1 5.1 Understanding the Calibration Process 5.2 Reviewing the Calibration Settings 5.3 Choosing a Calibrator 5.4 Calibrating Your SoundAdvisor 831C Module 6 Creating a Measurement Setup 6-1 6.1 831C Setup Manager Overview 6.2 Creating a Custom Setup File 6.3 Troubleshooting a Measurement Setup File Module 7 Making a Measurement 7-1 7.1 Before You Start 7.2 Performing the Measurement 7.3 Storing the Measurement Module 8 Managing Measurement Data Files 8-1 8.1 Setting Data File Storage Preferences 8.2 Using the Data File Manager 8.3 Saving, Moving, or Copying Data Files Module 9 System Properties 9-1 9.1 Setting Instrument Identification 9.2 Updating the Meter Time

ii-2 9.3 Using NTP to Sync the Meter Clock 9.4 Editing Power Settings 9.5 Setting Meter Preferences 9.6 Setting Localization Options 9.7 Setting Options On the Displays Tab 9.8 Enabling or Disabling Options 9.9 Setting Network Preferences 9.10 Setting Up Alert Notifications 9.11 Setting System Alert Notification Details 9.12 Setting Up Cloud Storage for Data Files 9.13 Utilizing the Logic In, Logic Out Feature 9.14 Setting Reference Spectra 9.15 Generating an App Password Module 10 System Information 10-1 Module 11 Using the Meter Lock 11-1 11.1 Locking the Meter 11.2 Choosing a Lock Mode 11.3 Allowing Calibration When Locked 11.4 Constraints 11.5 Unlocking the Meter Module 12 System Utilities 12-1 12.1 Troubleshooting Bad Flash Block Error Module 13 831C Network and Connections 13-1 13.1 Connecting to an Ethernet Port 13.2 Setting Up the Meter’s Network ID 13.3 Setting a Static IP Address 13.4 Using WiFi On Your 831C SoundAdvisor Module 14 Upgrading Firmware & Options 14-1 14.1 Updating the G4 LD Utility 14.2 Upgrading 831C Firmware by Using G4 LD Utility 14.3 Upgrading Options 14.4 Enabling or Disabling Optional Firmware Module 15 Using Measurement History 15-1 15.1 Setting Up a Measurement With Measurement History 15.2 Viewing Measurement History Data Files Module 16 Using Time History 16-1 16.1 Setting up a Measurement With Time History 16.2 Making a Time History Measurement With Sound Markers 16.3 Viewing Time History Data Module 17 Using Event History 17-1 17.1 Setting Up the Event History Measurement 17.2 Storing Event Data 17.3 Viewing Event History Data on the Event History Tab 17.4 Understanding Triggering Methods Module 18 Using 831C Sound Recording 18-1 18.1 Setting Up Markers for Sound Recording 18.2 Making a Manual Sound Recording Using Mark Sound Type 18.3 Making an Automated Event Sound Recording

ii-3 18.4 Enabling Measurement History Sound Recording 18.5 Understanding Recording Settings and Sound Quality 18.6 Sound Recording Playback Appendix A Technical Specifications A-1 A.1 Instrument Platform A.2 Base Software A.3 Octave Band Analysis Software – Option 831C-OB3 A.4 Event Logging Software – Option 831C-ELA A.5 Time History Software – Option 831C-LOG A.6 PTB Approved Firmware A.7 Frequency Response A.8 Declaration of Conformity Appendix B Measuring Sound Using IEC 61672-1 B-1 B.1 Overview B.2 Section 9.3 Appendix C Glossary C-1 C.1 Overview C.2 Glossary of Terms

Basic Operations 1-1 Module 1 Model 831C Features The SoundAdvisor Model 831C SLM is a Class 1 acoustic monitoring instrument with a full-color touchscreen that measures noise frequency, sound pressure level, and community and environmental sound. The “C” in 831C refers to the full-color screen. G4 LD Utility software (G4) connects your meter to your PC via USB, Bluetooth, WiFi, or TCP/IP. With G4 you can calibrate the meter, create setup files, download measurements, and analyze the results. 1.1 Basic Operations .................................................................................................................1-1 1.2 Applications .........................................................................................................................1-2 1.3 Hardware Features ..............................................................................................................1-2 1.4 Performance Features .........................................................................................................1-2 1.5 Standard 831C Package Contents ......................................................................................1-3 1.6 Options and Accessories .....................................................................................................1-3 1.6.1 Firmware Options .................................................................................................1-4 1.6.2 Hardware Options .................................................................................................1-4 1.1 Basic Operations The 831C performs the following operations: TRY THIS Explore the interface, press buttons, change settings, and test the operations. • Measures sound: stop, pause, and resume measurement • Display broadband and spectral sound values on a full-color display screen • View live and stored data while a measurement is in process • Log simultaneously to time, statistical measurement and event histories • Use markers to annotate portions of time histories, including voice annotation • Automatically back up data to prevent data loss on power failure • Calibrate using a Precision Acoustic Calibrator, and store calibration history • Time stamping for Lmax, Lmin, Lpeak-(max) single event metrics. • Sync clock with PC, attached GPS, or Network Time Protocol (NTP) • Create multiple Setup configurations using the Setup Manager

Applications 1-2 1.2 Applications The 831C monitors: • City noise • Construction noise • Airport noise • Nuisance noise • Noise ordinance compliance • Wind farm noise 1.3 Hardware Features The 831C is a precision-integrating sound level meter with the following hardware features: TAKE NOTE Up to 32GB USB memory can be purchased from Larson Davis as an option. • 2 GB internal industrial grade data memory • 240 x 320 full-color graphic LCD display with touchscreen user interface • Quiet Touch elastomeric keypad • Meter uses NiMH, photo-lithium, lithium-Ion, and alkaline cells; 4-AA batteries provide upwards of 8 hours operating time • AC/DC output jack with full dynamic range option • Compatible with 61 m (200 ft.) microphone extension cable (full scale to 20 kHz) • Dust-resistant, durable plastic case with lanyard (tripod mount is also available) • USB 2.0 high-speed host connector for mass storage, weather sensors, USB headset, and WiFi communication devices • USB 2.0 high-speed peripheral connector for control and data download by a PC • I/O connector for power, weather transducers, logic input/ output, and preamplifier communications 1.4 Performance Features • Large dynamic range > 120 dBA • RMS Detectors: Slow, Fast & Impulse • RMS Frequency Weighting: A, C & Z • Peak Frequency Weighting: A, C & Z • Any LevelTM Simultaneous measurement and display of Max and Min sound pressure levels (Slow, Fast and Impulse detectors), plus Leq and Peak levels, all with A, C and Z frequency weighting

Standard 831C Package Contents 1-3 • Weather Measurements (Wind Speed and Direction, Temperature, and Humidity with SEN03x) • Multiple language support: English, French, Italian, German, Spanish, and Chinese • Field-upgradeable firmware 1.5 Standard 831C Package Contents The 831C is available as part of a specialized system, or in a standard configuration. The following accessories come with the standard configuration: 1.6 Options and Accessories In this section: • 1.6.1 Firmware Options • 1.6.2 Hardware Options Accessory Type Available Items Microphones (377B02) ½-inch free-field prepolarized microphone, 50 mV/Pa, providing performance conforming to Class 1 sound level meter standards (377C20) ½-inch random incidence prepolarized microphone, 50 mV/Pa, providing performance conforming to Class 1 sound level meter standards Note: You can use other microphones with the 831C. For more information, see 1.6.2 Hardware Options for more information. Microphone Preamplifiers PRM831 PRM2103 Accessory Kit (831-ACC) includes these items: (831-CCS) Hard Shell Case (PSA029) Universal AC USB Power Adapter (CBL138) USB to mini-B cable, 1.8 m (WS001) 3 ½-inch windscreen 4 Rechargeable AA NiMH batteries Desktop Software The G4 LD Utility software (G4) comes on the included LD USB drive. The latest version of G4 is always available for download from www.LarsonDavis.com/G4. Lanyard

Options and Accessories 1-4 1.6.1 Firmware Options LEARN MORE To purchase these options, see “Contact Larson Davis” on page ii-2. The following upgrades/options are available to purchase from Larson Davis. 831C-LOG Time History data logging with periods from 2.5 ms to 24 hours. 831C-OB3 Real-time 1/1 & 1/3 Octave Frequency Analysis. 831C-ELA Measurement History for the manual or timed storage of statistical data, and exceedance-based Logging Analysis with Events. 831C-SR Make event based and manual sound recordings in WAV or OGG format that can be sent via email or SMS and stored in the measurement data. 831C-MSR Measurement History for the manual or timed storage of statistical data with all sound recording capabilities. 831C-SW Make direct USB communication with Sierra Wireless RV50X cellular gateway. 831C-AUD Using the AudCal software from Larson Davis in conjunction with your SoundAdvisor 831C enables you to test the calibration of audiometers and sound booths. 1.6.2 Hardware Options The following table contains only a few examples of the hardware accessories available for your 831C. Additional components include, but are not limited to, microphones, preamplifiers, software, power supplies, tripods, calibrators, sensors, protective cases, adapters, and cables. For a complete listing of standard and system accessories, see http://www.larsondavis.com/products/soundlevelmeters/ soundadvisor/soundadvisorordering.

Options and Accessories 1-5 Accessory Type Available Options Microphone Options Note: These mics are available directly from Larson Davis. You can also use other microphones with the 831C. (377A15) 1-inch, prepolarized pressure condenser microphone, 50 mV/Pa, providing performance conforming to Class 1 sound level meter standards (377B01) ¼-inch free-field prepolarized microphone, 50 mV/Pa, providing performance conforming to Class 1 sound level meter standards (377B10) ¼-inch free-field prepolarized microphone, 50 mV/Pa, providing performance conforming to Class 1 sound level meter standards (377C01) ¼-inch free-field prepolarized microphone, 50 mV/Pa, providing performance conforming to Class 1 sound level meter standards (377C13)½-inch, prepolarized, pressure condenser microphone, 50 mV/Pa, providing performance conforming to Class 1 sound level meter standards (377C10) ¼-inch free-field prepolarized microphone, 50 mV/Pa, providing performance conforming to Class 1 sound level meter standards Microphone Preamplifier Options (426E01) 1/2-inch ICP Low Noise microphone preamplifier (requires adapter (ADP074) (PRM2103) Outdoor microphone preamplifier Environmental Protection EPS Environmental Shell Protects microphone and preamplifier from rain and wind with mounting options for pipes, poles, and most tripods EPS030-831 Weather-proof enclosure for remote noise monitoring; includes battery NMS/EPS044 Solar-powered noise monitoring system for outdoor, long-term, and unattended sound monitoring NMS/EPS045 Permanently-installed, solar-powered noise monitoring system for outdoor, long-term, and unattended sound monitoring Weather Data Acquisition SEN031: combined weather sensor, wind speed and direction (with no moving parts), temperature, humidity, pressure, and rainfall (requires CBL170 and DVX008A) SEN032: Ultrasonic Anemometer: wind speed and direction only sensor (requires CBL170 and DVX008A). Communication DVX012, 013, 014, 015, 008A 831-INT-ET with integrated Ethernet capability GPS GPS001 GPS Receiver, USB Magnetic Mount

Options and Accessories 1-6 Equivalent Electrical Impedance Adapter Options Choose one of the following adapters in place of the microphone when making very high impedance measurements. The adapter acts as a series capacitor with the same capacitance as the microphone it replaces. If you’re making a square wave pulse measurement, include a 100 kHz, low pass, T filter with the adapter. (ADP002) 6.8pF BNC Input Adapter for ¼-inch, 7pF microphone equivalent (ADP090) 12pF, BNC Input Adapter for ½-inch, 12pF microphone equivalent (ADP092) BNC In-Line, Low Pass Filter, 75kHz Cables: Extension and Interface Cables Microphone Extension Cable: EXCXXX (shielded), where XXX is the length in feet (XXX = 010, 020, 050, 100 and 200 available) CBL138 USB Cable CBL139 AC/DC Output Cable Accessory Type Available Options

2-1 Module 2 Instrument Overview The SoundAdvisor Model 831C accomplishes all tasks related to sound monitoring. The 831C is a reliable and diversely competent meter. With the 831C, you can: • Measure all area sound • Stream and record audio continuously or for events using sample rates up to 51.2 ksps in compressed or uncompressed format • Communicate with via USB, Ethernet, cellular, or WiFi • Operate completely from the device itself, or remotely using G4 LD Utility software • Easily expand memory using USB memory • Automatically synchronize the clock with Network Time Protocol (NTP) or GPS for optimal accuracy • Select desired color theme on the full-color graphic LCD display with touchscreen user interface This module describes the hardware and visual components that make up the 831C. In this module: 2.1 Instrument Hardware Overview .........................................................................................2-2 2.2 Using the Keypad ................................................................................................................2-3 2.2.1 Navigating and Selecting ......................................................................................2-4 2.2.2 Basic Run Functions ..............................................................................................2-4 2.2.3 Entering Text .........................................................................................................2-4 2.3 Display Elements Overview .................................................................................................2-5 2.3.1 Changing Display Color Themes ..........................................................................2-5 2.3.2 Using Tabs and Pages ...........................................................................................2-5 2.3.3 About Status Bar Icons and Indicators ................................................................2-6 2.3.4 Main Menu Overview .............................................................................................2-9 2.3.5 Tools Menu Overview ..........................................................................................2-10 2.3.6 Power Control Menu Overview ...........................................................................2-11

Instrument Hardware Overview 2-2 2.1 Instrument Hardware O�er�iew FIGURE 2-1 831C Instrument Overview (front) Standard 1/2” free field or random incidence microphone Release button to disconnect the preamp from the meter 240 x 320 full-color graphic LCD display with touchscreen user interface (shown with Dark color theme) Display navigation softkeys Multicolor back-lit keypad Tools button leads to system set-up information On/Off button is also a one-touch power control access Reset/Clear Measurement USB Auxiliary port, AC/ DC output jack, and I/O connectors PRM831 Preamplifier

Using the �eypad 2-3 FIGURE 2-2 Instrument Hardware 2.2 Using the Keypad In this section: • 2.2.1 Navigating and Selecting • 2.2.2 Basic Run Functions • 2.2.3 Entering Text The 831C has 13 buttons that are used to start, stop, or pause a measurement� navigate within the display, and power the meter off. CAUTION DO NOT use the hardware power switch to turn the 831C ON or OFF. The purpose of this switch is to disconnect the batteries for long-term storage (1 to 2 weeks). See 3.8 Long Term Storage of 831C. CAUTION DO NOT use the AC/DC port as a headphone jack. 1. AU� connector intended for use with USB mass storage, cellular modem, GPS, headphones, speakers, and future devices. 2. Hardware Power Switch when set to “ 0 ” com- pletely powers down the 831C for storage. Set to “ � ” for instrument operation. 3. USB Interface 2.0 peripheral full-speed port used for communication, full control, and download- ing of data to PC. The PSA029 external power supply may be connected here. The maximum USB cable length is 1m and the cable is part number CBL138. 4. AC/DC 2.5 mm Output jack for analog AC/DC out- put signals. 5. The I/O Connector for peripherals and external power is typically used for external devices. Navigation buttons Up, Down, Right, Left Reset a measurement Power Access the menus. Stop or Store a measurement Run or Pause a measurement Select or Enter Softkeys: LEFT, RIGHT Navigate display tabs� CENTER Close or exit a menu.

Using the Keypad 2-4 2.2.1 Navigating and Selecting To navigate the display on the meter, you can press directly on the touchscreen using the tip of your finger, or use the navigation buttons as shown in Table 2.1. 2.2.2 Basic Run Functions The basic run measurement functions can be executed using the buttons as shown in Table 2.2: 2.2.3 Entering Text Table 2.1 Buttons for Navigation Action Button(s) Description Navigate to tabs */* Top left & right softkeys Navigate to pages 8 2 Up & down navigation button Navigate within display (e.g., move highlighted octave band) 4 6 Left & right navigation button Access content specific menu *** There are times when a content specific menu appears. Press the associated top soft key to access that menu. Exit a menu /*/ Press the top-middle soft key to close or save. To exit without saving, press it, and then select No or Cancel. Navigate up & down in a display 5 Press the ENTER button to move up and down on certain pages. Make a selection 5 Press the ENTER button to make a selection. Table 2.2 Buttons for Basic Run Action Button(s) Description Initiate a run 9 Start a measurement Pause a run 9 While the 831C is running, press this button to pause Stop measurement 7 End a measurement during a run or pause Store data file 7 Pressing the stop/store button while the meter is stopped will store the measurement data Reset measurement 1 Press once to clear unsaved measurement data. Press a second time to reset filters (this may take a few seconds).

Display Elements Overview 2-5 The 831C allows for complete operation from the meter itself. When you select a field to enter text, a virtual keypad appears. Use the UP, DOWN � �, and LEFT and RIGHT � � navigation buttons to navigate. Press e to make a selection. 2.3 Display Elements O�er�iew In this section: • 2.3.1 Changing Display Color Themes • 2.3.2 Using Tabs and Pages • 2.3.3 About Status Bar Icons and Indicators • 2.3.4 Main Menu Overview • 2.3.5 Tools Menu Overview • 2.3.6 Power Control Menu Overview 2.3.1 Changing Display Color Themes The 831C has a full-color, back-lit LCD touchscreen and allows you to select your preferred color theme. The Dark theme is featured in this manual. For more information, see 9.5.6 Customizing the Display Color Theme. 2.3.2 Using Tabs and Pages The 831C interface is organized into tabs. The Live and Overall tabs are further organized into pages that can be accessed using the UP � and DOWN � navigation buttons. If needed, additional pages of measurement data are available to purchase from Larson Davis. When the 831C is first powered on, the Live tab (Page 1) is the first screen you’ll see. Figure �-� reviews display elements that are common to most tabs. FIGURE 2-3 Live Tab (Page 1) Status bar icons. See 2.3.3 About Status Bar Icons and Indicators. Access the Tools menu View additional data on pages using the UP and DOWN navigation buttons. Measurement name of current running measurement Data display Session Log tab to the left� Overall tab to the right.

Display Elements Overview 2-6 There are 5 tabs in addition to the Live tab. Press the top-left or top- right softkeys (*/*)to navigate between tabs. Figure �-4 shows the next 2 tabs to the right of the Live tab. FIGURE 2-4 Navigating Tabs to the Right Live Tab: Since the Live tab shows active, real-time values that the meter is currently sensing, this page is not controlled by the (RUN/ PAUSE) button �. This allows you to view the current SPL without disrupting your measured data. You can enable and view up to 13 pages of Live data. Overall Tab: Values on the Overall tab are averaged from the start of the measurement up to the current time (Elapsed Time). If the measurement is stopped, the elapsed time stops. You can enable and view up to 20 pages of Overall data. Session Log Tab: The Session Log tab displays a record of meter actions during a measurement. The Session Log tab in Figure �-4 shows a time-stamped line item for every run, pause, resume, stop, and sound recording action. The source responsible for each action is also recorded. Resetting and storing data begins a new, blank session log. LEARN MORE For details on each tab, see Module 4 Using the Data Display. 2.3.3 About Status Bar �cons and �ndicators The status bar at the top of the screen displays the meter, measurement, connection, alert status, and battery status as shown in Figure �-�. FIGURE 2-5 Status Bar Power Indicator USB Memory Status WiFi Status OBA Indicator SLM Indicator Measurement Runtime Run Status File Name

Display Elements Overview 2-7 Power Indicators Battery Power Indicator The battery icon indicates the state of the battery charge by color and volume. When using battery power, the battery icon indicates the state of the battery from fully charged to depleted, left to right. The bolt symbol appears over the battery icon if the battery is currently charging. External Power Icon The external power connection icon appears when the 831C is powered from an external power supply or from the USB port. �iFi Status Icon See 13.4 Using �iFi On Your 831C SoundAdvisor. USB Memory Status Icons When you insert a USB drive into the 831Cs USB port, the USB drive icon appears in the Status bar of the meter’s display as shown in Figure �-�. If the Data Storage setting is set to USB, but no USB drive is inserted, the USB not available icon appears. Files save to the meter until you insert a USB drive. If the USB drive is removed during a measurement, the same icon appears, the measurement ends, and data with that measurement is not visible on the meter. When the USB drive is reinserted, the USB caution icon appears. The meter notifies you that there is unsaved data and prompts you to Save or Delete the measurement data. You cannot continue with the same measurement. Input Overload Icon When a signal from the preamplifier exceeds the calibrated input range of the 831C, the Input Overload icon appears. While the overload is present, the icon flashes. When the overload condition resolves, the icon is still present (not flashing) to indicate that an overload has occurred during the measurement. Press the RESET button to clear the icon from the display. Under Range Icon The Under Range icon displays in the status bar while an under range condition applies. For details about the under range level, see 5.1.2 Determining Noise Floor, Overload, and Under Range Levels.

Display Elements Overview 2-8 FIGURE 2-6 Under Range vs� Normal Range Data Display OBA Overload Icon The OBA Overload icon displays while the input to the Octave Band Analyzer is overloaded. TAKE NOTE When the OBA Range property is set to Normal, the OBA Overload Icon displays at a level 33 dB lower than if the OBA Range had been set to High. OBA Under Range Icon When the signal from the preamplifier drops so that the noise level of the instrument and the preamplifier influence the measurement, an Under Range condition exists. When all filters of the OBA are “under range” the OBA Under Range Icon flashes. Measurement Status Icons FIGURE 2-7 Measurement Status Icons Under Range Display Normal Range Display Values in an “under range” condition display darkly on the Live tab. Run A measurement is currently running. Stop A measurement is stopped. Reset A measurement reset has occurred. Run Pending The meter is waiting for filters and detector initialization to complete and will automatically start the run when the system is stable (typically less than 10 seconds). Pause The present run is paused.

Display Elements Overview 2-9 If the touchscreen is enabled, or if you’re operating the meter remotely, tapping the icon produces the following result: Sleep Icon When the 831C is not connected to a PC, it can be put in a battery power saving “sleep” mode that shuts down the analog circuitry, including the preamplifier. In this case, the Sleep icon displays in place of the measurement status icon. To learn more about power saving options, see 9.4 Editing Power Settings. File Operation Icon The file operation icon appears in the status bar while a file is saved to the USB, moved from the USB to meter, or copied. All these operations are done in the Data File Manager. For more information, see 8.2 Using the Data File Manager. 2.3.4 Main Menu Overview The 831C main menu contains the following 5 features: Setup Manager The Setup Manager is a menu on the 831C —divided into tabs just like the 831C main display— that enables you to customize measurement settings in a setup file or “Setup.” To access the Setup Manager, press the Menu soft key, and select Setup Manager. TAKE NOTE You can also create a setup file using G4 LD Utility, then transfer the file to the meter. For more information, see the G4 LD Utility Manual. Mark Sound Type When you’ve purchased and installed firmware option 831C-SR or 831C-MSR, this feature allows you to assign a Sound Type marker to the current sound. When you examine the data file after the Table 2.3 Using the Measurement Status Icon Measurement State Action Resulting Measurement State Run Tap Once Stop Run Double Tap Pause Pause Tap Once Run Stop/Reset Tap Once Run Stop/Reset Double Tap Store Run Pending N/A N/A Power Save Tap Once Run

Display Elements Overview 2-10 measurement, the marker indicates where that sound type occurred during the measurement. See 18.1 Setting Up Markers for Sound Recording. Adjust Graph Menu Allows you to adjust the X and Y on the visual graph when needed. See 4.4 Adjusting the Graph Scale. Reset This feature operates the same as the Reset button on the meter. Press once to clear any unsaved data for that measurement. Press a second time to reset filters. Wait a few seconds until filters reset completely before making a new measurement. Locate Print Screens Only available with printer inserted. 2.3.5 Tools Menu Overview Press the TOOLS 3 button gives you access to the following menus and settings on the 831C. Data File Manager Access all data files on the meter or inserted USB drive. Module 8 Managing Measurement Data Files. Calibrate Calibrate the microphone for accurate measurement. See Module 5 Calibrating Your SoundAdvisor 831C. Setup Manager Setup measurement parameters and metrics. Module 6 Creating a Measurement Setup. System Properties Access properties for the meter, set time, language, and other preferences. See Module 9 System Properties. About Tab: System Information Access system information. See Module 10 System Information. Lock Lock the meter’s screen to prevent tampering. See Module 11 Using the Meter Lock.

Display Elements Overview 2-11 System Utilities Format or restore file system. See Module 12 System Utilities. Communication Quick access to communication properties. See Module 13 831C Network and Connections. 2.3.6 Power Control Menu Overview To access the following actions on the Power Control menu, press the POWER button 0 once. • Battery Information • Display Brightness • Power Off • Reboot

Unpacking & Inspecting 3-1 Module 3 �etting Started In this module: 3.1 Unpacking & Inspecting ......................................................................................................3-1 3.1.1 Serial Numbers ......................................................................................................3-2 3.2 Connecting the Microphone & Preamplifier ......................................................................3-2 3.3 Connecting the Preamplifier to Meter ................................................................................3-3 3.4 Disconnecting the Preamplifier ..........................................................................................3-3 3.5 Powering the 831C SLM .......................................................................................................3-4 3.5.1 Using Battery Power .............................................................................................3-4 3.5.2 Using External Power ............................................................................................3-6 3.5.3 Understanding 831C Power Usage ......................................................................3-7 3.6 Powering On or Off ..............................................................................................................3-8 3.6.1 Viewing the Power Control Page Settings ...........................................................3-8 3.7 Operating the 831C Remotely .............................................................................................3-8 3.7.1 Operating the 831C from G4 LD Utility .................................................................3-9 3.7.2 Operating the 831C from the LD Atlas App ..........................................................3-9 3.7.3 Operating the 831C from a Web Browser ..........................................................3-10 3.8 Long Term Storage of 831C ...............................................................................................3-10 3.1 Unpacking � Inspecting TAKE NOTE Report any damage or shortage immediately to PCB Piezotronics, Inc. See “Contact Larson Davis” on page i-2. The 831C is shipped in protective packaging. First, verify the shipment contains all parts and accessories for the configuration you selected. Retain the packaging for safe shipment for calibration service. �a�le ��1 shows the basic contents, and �a�le ��� shows the 831C-FF configuration. Your 831C contents may differ. Table 3.1 831C �asic Contents SoundAdvisor Model 831C PRM831 Microphone Preamplifier 377B02 1/2-inch Microphone CAUTION� Sensitive to static electricity

Connecting the Microphone & Preamplifier 3-2 The 831C-FF and 831C-RI packages should include items in Table 3.1 and Table 3.2: 3.1.1 Serial Numbers The 831C serial number is printed on the back panel label. The microphone model and serial numbers are engraved on the outside of the microphone. The preamplifier model and serial numbers are engraved on the outside surface of the preamplifier. We recommend that you record the purchase date, model and serial numbers for your instrument, preamplifier, and microphone. 3.2 Connecting the Microphone � Preamplifier CAUTION DO NOT handle the microphone and preamplifier without observing the following items: • Ground yourself so the pogo pin is not exposed to static shock. • Never use excessive force. • Gripping tightly or screwing tightly is unnecessary. • Do not remove the microphone grid cap and expose the dia- phragm. Table 3.2 831C�FF Package 831C-CCS Hard Shell Case PSA029 Universal AC Power Adapter WS001 3 �-inch Windscreen Lanyard 4 AA NiMH Batteries LD USB Drive with • G4 LD Utility software • 831C Reference Manual • Digital Calibration Certificates

Connecting the Preamplifier to Meter 3-3 FIGURE 3-1 Microphone and Preamplifier Step 1 Carefully place the bottom of the microphone over the top of the preamplifier and gently screw the assembly together. The microphone body should seat smoothly against the preamplifier body. To disconnect the microphone: • Lightly grip the 2 engraved lines on the microphone body and gently turn. 3.3 Connecting the Preamplifier to Meter CAUTION Do not attempt to screw the preamplifier onto the 831C. Step 1 Both the preamplifier and the preamplifier housing on the meter are marked for correct alignment� look for a vertical, engraved line on the preamplifier, which aligns with the arrow about the button on the 831C. For reference, see Figure �-�. Step 2 With the alignment marks on both pieces lined up vertically, insert the 5- pin connector at the bottom of the preamplifier snugly into the top of the 831C until you hear a small click. 3.4 Disconnecting the Preamplifier FIGURE 3-2 831C Preamplifier Housing The bottom of the microphone attaches to the top of the preamplifier. The preamplifier body houses a single gold pin with threads on the top edge, which are designed to fit the 1/2-inch microphone. CAUTION� Do not allow dust or debris to collect in an unassembled preamplifier. To disconnect the preamplifier, press and hold this button while gently pulling the microphone/preamplifier assembly from the meter.

Powering the 831C SLM 3-4 3.5 Powering the 831C SLM In this section: • 3.5.1 Using Battery Power • 3.5.2 Using External Power • 3.5.3 Understanding 831C Power Usage 3.5.1 Using Battery Power CAUTION Do not mix Alkaline and NiMH batteries. Only charge NiMH bat- teries. CAUTION Do not mix batteries from different manufacturers, replace all 4 batteries at the same time. CAUTION When changing batteries, select the correct Battery Type in System Properties. See 9.4.1 Changing Batteries and Editing the Bat- tery Type. CAUTION Resolve a Session Log entry “Charging Stopped” by checking the batteries, and ensuring the correct battery type is selected in System Properties. Additionally, the battery may be too old to charge. Battery may also be read as an incorrect battery type, which may occur with fully discharged NiMH batter- ies. Use an external battery charger to restore charge, then install in meter. Addi- tionally, the batteries may be too hot or too cold. CAUTION The 831C is compatible with Energizer, Duracell, and other commercially-recognized brands of these battery types: • AA nickel metal hydride (NiMH) • AA Alkaline • AA 1.5 Volt Lithium CAUTION Optimal battery temperature is 0° C–45° C. Current Battery Voltage is displayed on the Power Control page. To access the Power Control page, press the Power button 0. In the Status Bar section of the meter display, the battery icon indicates the state of the battery charge by the color and fill. Understanding the Low Battery Indicator As the battery nears the end of expected life, the empty battery symbol begins to flash. When the battery is no longer functioning, the 831C stops running, saves all data and instrument status, then turns off. When you power the 831C is again with fresh batteries or an external power supply, the unit returns to the state it was in prior to shutting down. Full Charge Low Charge

Powering the 831C SLM 3-5 Installing Batteries The battery compartment of the 831C is on the back of the instrument. When installing batteries, always insert 4 fresh AA batteries, and observe polarity markings as shown here. Charging Batteries in the 831C Before you begin: • Install batteries as shown in Installing Batteries. You can charge batteries (NiMH only) in the meter in about 7 hours when the meter is turned OFF. Step 1 On the 831C, press Tools 3  System Properties. Step 2 Select NiMH as the Battery Type. Step 3 The Charge drop-down menu is automatically set to On. If you do not want your power source to charge the batteries, select Off.

Powering the 831C SLM 3-6 Step 4 Select Save, then click Yes to confirm your choice. TAKE NOTE Batteries charge more efficiently when the meter is powered off. For details about 831C button LED indicators, see “Understanding Charging Status LED Indicators”. Step 5 Power the meter OFF. Step 6 Connect the meter (with the USB cable) to the included power cable (PSA029), and plug this in to a wall outlet or other external power source. TAKE NOTE If you’re using a power cable other than the one supplied with the meter, use a 28 AWG or larger wire for proper charging. Understanding Charging Status LED Indicators The charge status indicated by the green LED behind the Power button is as follows: • Solid green: Charging • No green light: Not charging • Green light wink: Maintaining charge • Green light fast blink (two times per second): Charger fault • Green light fastest blink (three times per second): Meter is powering up or shutting down Resolving a “Charging Stopped” Session Log Entry To resolve a “Charging Stopped” Session Log entry, check the battery placement, and make sure the correct Battery Type is selected (Tools  System Properties). Resolving an “Incorrect Battery Type” Session Log Entry Infrequently, when the battery becomes too old to charge, the meter may register the battery as the incorrect battery type. This can also occur when newer NiMH batteries are fully discharged. In this case, charge the batteries using an external battery charger, then install them in the meter. You may also see this error when the batteries become too hot or too cold. Optimal battery temperature is 0° C–45° C. 3.5.2 Using External Power We recommend maintaining the internal battery The 831C utilizes the following external power sources: • USB port from a computer • USB port from PSA029 power supply • I/O connector from an external +10.8 to +25 Volt DC mains power source.

Powering the 831C SLM 3-7 Using USB Port Power The 831C can be powered via the mini-USB Type B port with the PSA029 external power supply and the included power cable (CBL138). The mini-USB Type B connector is located on the bottom of the meter. CAUTION If you operate the 831C without batteries and power is interrupted, you may loose your data. With the PSA029 power supply connected and operating at rated conditions, the 831C operates properly with or without batteries installed. Use the included cable to prevent excessive power loss. 3.5.3 Understanding �31C Power Usage Understanding a Low �oltage Shutdown Event The 831C preserves the service life of an external battery by preventing it from being discharged excessively. When the battery voltage drops below the External Shutoff Voltage (default value +10.8 volts) and remains above +10.2 volts for one minute, the instrument stops, saves data, and turns off. Understanding a Power On After Power Loss Event When the 831C is powered from an external supply and the input voltage falls below the indicated External Shutoff Voltage threshold, it powers off. When the 831C shuts down due to a low battery, it automatically attempts to power up after a short reprieve. If there’s adequate power, it remains on. However, if the battery is still discharged, it powers off. This attempted “power on” cycle continues until the meter has sufficient power to remain on. This feature is designed to allow the 831C to automatically restart when power is lost due to low solar situation or after an extended power outage. LEARN MORE To learn more about reboot time after a power loss, see “Low Power At Boot-Up” on page A-5. Understanding a Sudden Loss of External �oltage Event When the external voltage is suddenly lost—if the external supply is disconnected or the main power fails and there is no external battery— the 831C continues to run on internal batteries if they are present and in good condition. If battery power is not present, the 831C immediately switches to an internal recovery battery and powers down safely. Understanding the External Power Indicator When connected to an external power source using the included USB cable, the External Power icon replaces the Battery icon. If your meter has fully-charged NiMH batteries and is plugged into a power source, this icon indicates that it’s using power from the external source, and is not charging or using any power from the batteries.

Powering On or Off 3-8 Understanding a Low Power At Boot�Up Event At start up, the 831C performs a power check. If the supplied power is too low, the low power icon displays over top of the first display. For more information see Table A.3, “Low Power At Boot-Up”. 3.6 Powering On or Off Powering On Press and hold the ON/OFF button 0 on the meter until the screen flashes and the green LED under the button turns on. Powering Off There are 3 ways to power off the 831C: 1. Press the ON/OFF button 0 once to access the Power Control page, then press the top-left softkey to select Off. 2. From any screen, press and hold the ON/OFF button 0 for 3 seconds to begin the shut down sequence. 3. Press and hold the ON/OFF button 0 for 10 seconds to force an immediate shutdown. CAUTION� Using this method may result in lost data. 3.6.1 Viewing the Power Control Page Settings From the Live tab, press the UP button � to view your meter’s current power settings (Live 8/8). 3.7 Operating the 831C Remotely Other than direct control on the meter interface, there are 3 ways you can remotely operate the 831C: Battery settings display here. You can edit these settings from the Power Control page. For more information, see 9.4 Editing Power Settings.

Operating the 831C Remotely 3-9 • From a mobile device. See 3.7.2 Operating the 831C from the LD Atlas App. • From your PC via G4 LD Utility software (G4). See 3.7.1 Operating the 831C from G4 LD Utility. • From the Chrome browser on your PC or mobile device. See 3.7.3 Operating the 831C from a �eb Browser. 3.�.1 Operating the �31C from G4 LD Utility To operate and manage the 831C from your PC using G4, complete the following process: Step 1 Provide your meter with any of the following connections to your PC: USB cable, WiFi adapter, TCP/IP, or Bluetooth adapter. LEARN MORE For more information, see the G4 LD Utility Manual Module 1 Introduction. The manual is available at LarsonDavis.com/G4. Step 2 Install G4 on your PC. Installing �� a. Locate the most recent version by navigating to LarsonDavis.com/G4 and choosing the version you need from the Software section. b. The G4 installer downloads as a ZIP file to your PC. c. Extract and install the E�E file. G4 creates a shortcut on the Desktop and an item in your Start Menu. Step 3 Launch G4. Meters using WiFi, USB, or Bluetooth connections may automatically display in the Meters Panel on the left. LEARN MORE For more help connecting your SoundAdvisor, see Module 13 831C Network and Connections. Step 4 Click the name of your connected meter. This opens the Meter tab. Recommended Next Steps: • 5.4 Calibrating Your SoundAdvisor 831C 3.�.2 Operating the �31C from the LD Atlas App Step 1 Install the LD Atlas app. Connected Not Connected

Long Term Storage of 831C 3-10 Installing LD Atlas for Mobile Devices The LD Atlas app is available for Android from the Google Play Store�1, or for iOS from the Apple App Store�.2 a. Open the app store on your mobile device. b. Search for “LD Atlas” and follow the prompts. Step 2 Make a Bluetooth, WiFi, or other connection to your mobile device. For more information, see Module 13 831C Network and Connections. Step 3 Launch LD Atlas on your mobile device, then select your active meter in the meters panel. 3.�.3 Operating the �31C from a �eb Browser We recommend using LD Atlas, but if needed you can operate your meter remotely by using a web browser. Step 1 With the 831C, make a secure connection to the Internet. For more information, see Module 13 831C Network and Connections. Step 2 Open a web browser on a mobile device or PC. We recommend using Chrome. Step 3 In the address field, type the IP address of your 831C Sound Advisor. Ex: 198.999.103.25/SoundAdvisor TRY THIS To find your meter’s IP address go to Tools Setup �iFi. Step 4 Navigate the interface in the browser just as you would from the meter. 3.8 Long Term Storage of 831C CAUTION DO NOT use the hard- ware power switch to turn the 831C OFF. Permanent damage and data loss may occur. Press the Power button once, then select Off. The Hardware Power Switch on the bottom of the 831C disconnects the batteries from the 831C hardware (For reference, see Figure �-�. The real-time clock maintains its value while the switch is off. The power switch prevents battery drain when the meter is not in use for an extended period of time. If you plan to store the meter for more than 2 weeks, remove the batteries. 1. Android is a trademark of Google LLC. 2. Apple and iPhone are trademarks of Apple Inc., registered in the U.S. and other countries. Multi-Touch is a trademark of Apple Inc. Connected Not Connected

Long Term Storage of 831C 3-11 If the switch is in the “ 0 ” position, the batteries are disconnected. After installing batteries be sure to move the switch to the “ | ” position.

Understanding the Live Tab 4-1 Module 4 Using the Data Display The 831C takes a measurement, and simultaneously displays that same information in a variety of ways. Using the 831C tabs (select left or right) and their associated pages (scroll down and up), you can take a measurement and view the following metrics at the same time: • Real time sound metrics • Frequency of sound at each octave • Leq, LS, LPEAK of the overall or live sound • Fast and Impulse detectors • Temperature, GPS, and elevation of the measured sound • The current sound, weighted for specific values 4.1 Understanding the Live Tab ...............................................................................................4-1 4.1.1 About the SLM Page (Live Tab Page 1) .................................................................4-2 4.1.2 About the Big Digit Sound Page (Live Tab Page 2) ..............................................4-3 4.1.3 About the Octave Band Analyzer Page (Live Page 3) ..........................................4-3 4.1.4 About the Normalized Octave Band Page (Live Page 4) .....................................4-3 4.1.5 About the Triggering Page (Live Page 5) ..............................................................4-4 4.1.6 About the Preamplifier Interface Page (Live Page 6) ..........................................4-4 4.1.7 About the Power Page (Live Page 7) ....................................................................4-5 4.2 Understanding the Overall Tab ..........................................................................................4-6 4.2.1 About the Overall SLM Page (Overall Page 1) ......................................................4-6 4.2.2 About the Overall Big Digit Page (Overall Page 2) ...............................................4-7 4.2.3 About the Overall Leq Page (Overall Page 3) .......................................................4-7 4.2.4 About the Octave Band Analyzer Page (Overall Page 4) .....................................4-8 4.2.5 About the Normalized Octave Band Page (Overall Page 5) ................................4-9 4.2.6 About the Ln Percentiles Page (Overall Page 6) ................................................4-10 4.2.7 About the Exceedances Page (Overall Page 7) ..................................................4-11 4.2.8 About the Overloads Page (Overall Page 8) .......................................................4-12 4.2.9 About the Community Noise Page (Overall Page 9) ..........................................4-12 4.2.10 About the C Minus A Impulsivity Page (Overall Page 10) ..................................4-13 4.2.11 About the TA-Lärm Page (Overall Page 11) .......................................................4-14 4.2.12 About the Sound Exposure Level Page (Overall Pages 12) ...............................4-14 4.2.13 About the Metrics Matrix Page (Overall Page 13) ..............................................4-14 4.2.14 Viewing the Power Page (Overall Page 14) ........................................................4-15 4.3 Understanding the Session Log Tab ................................................................................4-16 4.4 Adjusting the Graph Scale .................................................................................................4-17 4.5 Enabling or Disabling Display Tabs ..................................................................................4-17 4.1 Understanding the Live Tab When the 831C is powered on, the Live tab is the first display you’ll see. Since the values on the Live tab show active, real-time values that the meter is currently sensing, this page is not controlled by the 9 (RUN/ PAUSE) button. This allows you to view the current SPL without disrupting your measured data.

Understanding the Live Tab 4-2 Press the UP � or DOWN � navigation buttons to scroll up or down through the pages on the Live tab. LEARN MORE For more information, look for specific terms or labels in the Appendix C Glossary. The labels for sound metrics on the 831C are designated by international standards. For many displayed values, the frequency and time weighting are indicated in the name of the metric. For example, LAS is the A-weighted sound pressure level measured using the Slow detector. Sound pressure level is often referred to as SPL. TAKE NOTE Depending on which features and options you’ve enabled, your 831C Live tabs may differ from those shown in this section. 4.1.1 About the SLM Page �Live Tab Page 1� Page 1 on the Live tab presents a recent history of metrics. You can customize the displayed metrics as shown below in this section. TRY THIS While on the Live (1 of 8) page, press the ENTER 5 button, and select a new “e�uivalent” parameter from the pop-up menu. FIGURE 4-1 Details of the Live Tab� Page 1 1. The duration of the current measurement. This time resets when with an auto-store or a measurement reset. 2. 3. The graph presents the last 120 seconds of the measurement. 1. LAe�(1s) is the most recently graphed 1 second value. The frequency weighting for this value, and possibly the detector, corresponds to the metric you select from the Live tab pop-up menu. 2. LAe� corresponds to the metric you choose in the pop-up menu on this tab. The default value is LAS. 3. L�peak (as shown above) is the current value from the 1s peak detector. The fre- quency weighting (Z in this case) corre- sponds to your Peak selection in the pop- up menu on this tab.

Understanding the Live Tab 4-3 4.1.2 About the Big Digit Sound Page �Live Tab Page 2� The big digit display is the easiest to observe both the instantaneous sound level and if the sound exceeds a trigger level that the user defines. FIGURE 4-2 Live Tab: Big Digit Display Page 4.1.3 About the Octave Band Analyzer Page �Live Page 3� TAKE NOTE This feature requires the 831C-OB3 firmware option. Four pages on the Live tab relate to the octave band setting you choose in the measurement setup (1/1, 1/3, or both). The height of each band in the graph is the amplitude of sound for that frequency. FIGURE 4-3 Live Tab: 1/1 Octave Band Page 4.1.4 About the Normalized Octave Band Page �Live Page 4� TAKE NOTE The normalized octave band page only displays when you enable the Spectral Ln feature in the measurement setup file. Current value: Frequency weighting and detector defined from the measurement setup, and updated once per second. Peak exceedance will gray out if it is under range Current time on the meter Each band is one full octave that increases from left to right. Use the LEFT and RIGHT (��) navigation buttons to highlight the desired band and the numerical values below will reflect the information at that octave. Frequency weighting and detector Frequency band level The purple band on the far right represents an average sum of all the bands

Understanding the Live Tab 4-4 Similar to the regular octave band pages in display, the normalized band pages show octave bands (for 1/1 or 1/3) and the numerical values of the highlighted band. However, the data is normalized using the reference spectra you define at ToolsSystem Properties Reference Spectra. FIGURE 4-4 Live Tab: Normalized Octave Band Page 4.1.5 About the Triggering Page �Live Page 5� The Triggering page shows when any of the Trigger levels you define in the measurement setup have been exceeded. FIGURE 4-5 Live Tab: Triggering Page 4.1.6 About the Preamplifier �nterface Page �Live Page 6� Use the information on the preamplifier interface page to validate the proper operation of the meter. Figure 4-� shows how this page’s display may differ, depending on the preamp installed. Use the RIGHT and LEFT arrow buttons to highlight the bands and change the numerical values. On this page, pressing ENTER 5 moves this arrow selector between the following options: Ref, Set Reference, and back to the Octave. View References 1, 2, 3, 4, A, - A, C, and -C Save the current selected values to use as a reference by selecting Set Reference. Current live sound When the SPL1 & SPL2 triggers are exceeded they change from white to orange and red respectively. If sound levels in the measurement exceed the Peak triggers, the values displayed here turn from white to orange and red respectively.

Understanding the Live Tab 4-5 FIGURE 4-6 Live Tab: Preamplifier Interface Page 4.1.� About the Power Page �Live Page �� The Power page shows the meter status items as shown in Figure 4-7. FIGURE 4-7 Live Tab: Power Page Reviewing Battery States The battery will be in one of the following states: • Estimated battery runtime • If the meter is being powered by batteries, then an esti- mated runtime will be listed in hours. • Charger Off • The batteries are not being charged. • Charging Preamplifier currently connected The voltage of the preamplifier connected is shown in VDC When a 426A12 is installed this page provides information like temperature and humidity as well as desiccant maintenance information. The current date and time can easily be seen on this page. Voltage of the battery and the USB external power source can be tracked here. Checking the internal temperature of the meter periodically is always good safety practice. Amount of internal memory available

Understanding the Overall Tab 4-6 • Batteries are being charged • Maintain Charge • Batteries are at capacity • Low Power Input • The USB cannot supply power sufficient to charge the internal batteries. • Too Hot/Cold • Batteries are not charging because there is invalid tem- perature range detected for safe charging. • Over Voltage • Tried to charge non-rechargeable cells or batteries are failing 4.2 Understanding the O�erall Tab The Overall tab is similar to the Live tab, with an SLM page and subsequent pages showing sound data. However, the Overall tab shows the data collected from the current measurement. The overall data resets when the measurement is stopped and saved, or when you press the Reset button 1. TAKE NOTE There are other pages of data on Overall tab, which are available to purchase form Larson Davis. Depending on the options and features you’ve enabled, your 831C Overall tabs may differ from those shown in this section. 4.2.1 About the Overall SLM Page �Overall Page 1� FIGURE 4-8 Overall Tab: SLM Page Run time of current measurement. This time continues during a pause. Leq value uses the frequency weighting and detector from the measurement setup file. It is the equivalent sound based on the run time of the measurement. The data graph presents info from start to finish, left to right respectively. This SLM metric is customizable. Press ENTER 5 to select a new metric from the pop-up menu.

Understanding the Overall Tab 4-7 4.2.2 About the Overall Big Digit Page �Overall Page 2� FIGURE 4-9 Overall Tab: Big Digit Page 4.2.3 About the Overall Le� Page �Overall Page 3� FIGURE 4-10 Overall Tab: Le� Page L�peak(max) The highest level the peak detector has measured during the run time of the measurement. A date and time of occurrence is recorded with this event. It’s considered the peak hold. LASmax The highest level the SPL detector measured during the run time of the measurement. It’s considered the max hold. LASmin The lowest level the SPL detector measured during the run time of the measurement. A date and time of occurrence is recorded with this event. Leq using frequency weighing and detector indicated User defined SPL1 Trigger Level and the percentage of time the overall measurement was over the trigger level Maximum sound level during measurement Peak level reached during measurement Time since pause was initiated. The time will accrue each time you pause a measurement. LAeq and the LAS of the overall measurement The LZpeak (Z frequency weighting) is the overall reading of the peak detector during the measurement. These 3 SPL detectors give the date and time when these metrics were met during the measurement. This run time stops during a pause or stop.

Understanding the Overall Tab 4-8 4.2.4 About the Octave Band Analyzer Page �Overall Page 4� TAKE NOTE This feature requires the 831C-OB3 firmware option, and OBA enabled in the measurement setup file. Two pages on the Overall tab relate to the octave band setting you choose in the measurement setup (1/1, 1/3, or both). The height of each band in the graph is the amplitude of sound for that frequency. The 1/3 Octave band pages are similar, but each band represents a bandwidth of 1/3 octave. LEARN MORE �ust like the Live tab, you can customize the metrics on this octave band page as shown in 4.1.3 About the Octave Band Analyzer Page (Live Page 3). The Overall tab’s octave band pages show measurement data from the first run to the present time. Overall data clears when the measurement is stored, or after you reset 1 the meter. Figure 4-11 shows that the numerical values on the Octave Band page are color coded to indicate a relationship to the graphed octave band. For example, the blue box next to the LAeq data corresponds to the blue bands in the graph. FIGURE 4-11 Overall Tab: 1/1 Octave Band Page Table 4.1 O�erall Octa�e �and Colors Le� “Leq” is the average sound level of the highlighted frequency band for the duration of the measurement.

Understanding the Overall Tab 4-9 4.2.5 About the Normalized Octave Band Page �Overall Page 5� TAKE NOTE This feature requires the 831C-OB3 firmware option, and OBA enabled in the measurement setup file. FIGURE 4-12 Overall Tab: Normalized Octave Bands Similar to the OBA Overall Page 4, the normalized octave band page displays numerical values of the highlighted band. The data is then Lmax Lmax is the maximum sound level of the highlighted frequency band. The maximum spectrum is determined by the Max Spec setting. Bin Max When set to Bin Max, it is the maximum value which occurred during the entire measurement for that frequency band. Since individual frequency bands may reach their maximum levels at different times, this spectrum might be one which never occurred at any instant during the measurement period. At Max When set to At Lmax, it is the instantaneous spectrum at the moment when the broadband maximum occurred (such as LSmax). Lmin Lmin is the minimum sound level of the highlighted frequency band for the duration of the measurement. Since individual frequency bands may reach their minimum levels at different times, this spectrum might be one which never occurred at any instant during the measurement period. Table 4.1 �Continued�O�erall Octa�e �and Colors Highlight the bands to change the selected frequency by using the left and right arrow keys Press 5 to jump to Ref, Set Reference, and back to Octaves Set Spectra by selecting Set Reference after making changes to the weighting and reference. The user defined references are determined by navigating Tools Menu���System Properties� ��Reference Spectra

Understanding the Overall Tab 4-10 normalized using the Spectral Ln value you select in the measurement setup file. If the frequency components are too small or too large, use the Adjust Graph function described in 4.4 Ad�usting the Graph Scale. FIGURE 4-13 Overall Tab: 1/3 Octave Spectral Ln 4.2.6 About the Ln Percentiles Page �Overall Page 6� FIGURE 4-14 Overall Tab: Ln Percentiles Page Table 4.2 Reference Spectra Options User Defined 1 2 3 4 Positive Frequency Weighting A C Negative Frequency Weighting -A -C Ln as a function of frequency for the six user-selected values of n Frequency at highlighted band Ln values at highlighted band LNF50 � 60.8 dB means that the Fast (F) time-weighted level exceeded 60.8 dB 50% of the time during the measurement.

Understanding the Overall Tab 4-11 LEARN MORE For a more in- depth discussion of Ln values, see Ln Value in the ���en�i� � Gl���ary. An Ln percentile is a statistical measurement of the level that exceeds “n” percent of the time. The statistics are based on the level defined by the current weighting and detector. The Ln Percentiles page displays the 6 Ln statistics for the measurement based on the run time, and the maximum and minimum sound levels measured. You can customize the threshold level in the measurement setup prior to or during a measurement. For details on this, see 6.2.2 Customizing Setup Values On the Setup Manager Tabs. The values of Ln are calculated from an amplitude distribution table, ranging from 0 to 200 dB, in 0.1 dB increments. As a result, it is possible to calculate Ln values from values of n ranging from 00.01% to 99.99%. 4.2.� About the Exceedances Page �Overall Page �� The Exceedances page has 2 LAS and 3 Lpeak exceedance values. Figure 4-1� shows that each time a trigger level is exceeded during a run, the counter for that level advances, and it displays in orange or red instead of white. An exceedance occurs when the level defined by the current weighting and detector exceeds the Trigger Level you set in the measurement setup. For details on this, see 6.2.2 Customizing Setup Values On the Setup Manager Tabs. FIGURE 4-15 Overall Tab: Exceedances Page During the exceedance After the exceedance # of exceedances Time of last exceedance

Understanding the Overall Tab 4-12 4.2.� About the Overloads Page �Overall Page �� FIGURE 4-16 Overall Tab: Overloads Page The Overloads page shows the number of times, the percent of time, and the amount of time that the Sound Level Meter and the OBA have been overloaded. LEARN MORE You can find more overload information in 5.1.2 Determining Noise Floor, Overload, and Under Range Levels. 4.2.9 About the Community Noise Page �Overall Page 9� The Community Noise page displays the values LDN and LDEN which are commonly used to evaluate community noise. Since community noise metrics are based upon full day measurements, they do not present valid data for measurements less than 24 hours duration. TAKE NOTE The metric CNEL is equivalent to LDEN. FIGURE 4-17 Overall Tab: Community Noise Page

Understanding the Overall Tab 4-13 Metrics shown here are dependent on the number of Day, Evening, and Night hours, which you set in the measurement setup file. Understanding LDEN Although the standard ISO 1996-2:2007 specifies default values used in the calculation of LDEN, in practice the time values defining the day, evening and night periods may be changed, as permitted by Directive 2002/49/EC of the European Parliament and of the Council of 25 �une 2002 relating to the assessment and management of environmental noise. It is important to verify prior to measurement that the values have been properly defined for your purposes. For help setting these values, see 6.2.2 Customizing Setup Values On the Setup Manager Tabs. 4.2.10 About the C Minus A �mpulsivity Page �Overall Page 10� FIGURE 4-18 C Minus A Impulsivity The “C minus A” metric provides an indication of the low frequency content of noise measured. This is done by subtracting the A-weighted equivalent level from the C-weighted equivalent level. The integrated levels for LAeq are always calculated using the linear detector, regardless of the value selected in the SLM Setup. The LAIeq value is from the impulse detector.

Understanding the Overall Tab 4-14 4.2.11 About the TA-L�rm Page �Overall Page 11� FIGURE 4-19 TA�Larm 4.2.12 About the Sound Exposure Level Page �Overall Pages 12� FIGURE 4-20 Sound Exposure Level Page 4.2.13 About the Metrics Matrix Page �Overall Page 13� The metrics matrix page shows all the data the meter is always measuring in one page. You can use the ENTER 5 button to move the cursor and enable more information� for example, if you want to see when a peak was measured as shown in Figure 4-�1. This metric is primarily used in Germany. To turn off this display, or any other display that is not related to your measurement, see 4.5 Enabling or Disabling Display Tabs. This page is primarily used for the practice of industrial hygiene.

Understanding the Overall Tab 4-15 FIGURE 4-21 Metrics Matrix page 4.2.14 Viewing the Power Page �Overall Page 14� The power page on the Overall tab shows all records for that measurement, and the status of the meter’s internal memory. This is the final page on the Overall tab. FIGURE 4-22 Overall Power Page Clock icon indicates the time is currently synced with NTP servers.

Understanding the Session Log Tab 4-16 4.3 Understanding the Session Log Tab FIGURE 4-23 Session Log Tab On the Session Log tab, the 831C creates a time-stamped record for every meter action, including Calibrate, Run, Pause, Resume, Stop, Voice Message, and Sound Recording, and others. When you store a data file or press the RESET button 1, the session log clears and begins a new log. The source responsible for each logged action is also recorded. Session Log meter actions include the following: A calibration occurred The measurement was paused A run was initiated There was a time sync Highlight the log entry to see the meter source near the bottom of the screen. Back-erase occurred Table 4.3 831C Meter Actions that Create Log Items �ey press Measurement stop Measurement run Measurement pause Resume from pause Measurement reset Calibration record and change Back-erase Marker set Run timer complete GPS Time Sync Low battery Charging stopped Out of memory Preamplifier connect/ disconnect Create new average 831 INT-ET (Comm Failure) USB Connection detected NTP Time Sync System time change

Adjusting the Graph Scale 4-17 4.4 Ad�usting the Graph Scale The default amplitude (dB) setting for the graphic display of sound pressure level versus time and frequency spectra are as indicated in this table: To change the scaling of any one of these graphs, do the following: Step 1 On the 831C, go to Menu ��Ad�ust Graph. Step 2 Use the UP, DO�N (��), and RIGHT, LEFT (� �)navigation buttons to select a new Y Max and Y Min. Step 3 Press the Close softkey (/*/), then select Yes to save your changes. 4.5 Enabling or Disabling Display Tabs Step 1 On the 831C, go to Tools System Properties. Step 2 Use the top-right softkey (*//)to navigate to Displays. Step 3 From the Tabs drop-down, select the tab your option is associated with. Step 4 Select the checkbox in-line with the options you want visible on the meter. Step 5 Press Close (*/*), then select Yes to save your changes. Select No to exit without saving. Table 4.4 Default Settings for the Graphical Display Level vs. Time Graphs 20 dB to 140 dB Frequency Spectra, Normal Range 20 dB to 140 dB Frequency Spectra, Low Range -10 dB to 110 dB

Understanding the Calibration Process 5-1 Module 5 Calibrating Your SoundAdvisor 831C In this module: 5.1 Understanding the Calibration Process .............................................................................5-1 5.1.1 Determining Microphone Sensitivity ...................................................................5-1 5.1.2 Determining Noise Floor, Overload, and Under Range Levels ...........................5-1 5.1.3 Understanding Calibration Stability ....................................................................5-2 5.2 Reviewing the Calibration Settings ....................................................................................5-2 5.2.1 Calibrate Tab .........................................................................................................5-3 5.2.2 Calibration Settings Tab .......................................................................................5-3 5.2.3 Calibration History Tab ........................................................................................5-3 5.2.4 Calibration Certification Tab ................................................................................5-4 5.3 Choosing a Calibrator .........................................................................................................5-5 5.4 Calibrating Your SoundAdvisor 831C .................................................................................5-5 5.1 Understanding the Calibration Process 5.1.1 Determining Microphone Sensitivity The primary role of sound level meter calibration is to establish a numerical relationship between the sound level at the diaphragm of the microphone and the voltage measured by the meter so that the sound pressure level can be read directly from the display of the meter in dB. The result of a calibration is the determination of the sensitivity of the meter, including microphone and preamplifier, typically in dB re 1V/Pa or mV/Pa. 5.1.2 Determining Noise Floor, Overload, and Under Range Levels A secondary role of calibration is to determine the sound level which would overload the instrument (Input Overload level) and the minimum sound level (Under Range level) that can be accurately measured without being influenced by the operational noise from the meter (Noise Floor). Noise Floor Level The noise floor is calculated as the energy sum of the noise generated by the microphone, preamplifier, and instrument circuitry. The appropriate noise floor, and nominal sensitivity compute automatically in the 831C with the following preamplifiers and their commonly paired microphones: • PRM831 • PRM2103 • ICP with ADP074

Reviewing the Calibration Settings 5-2 Overload Level When using a microphone having a sensitivity of 50 mV/Pa, the input overload may occur approximately as shown in Table 5.1. Under Range Level The Under Range level is the higher of the following levels: 1. Noise Floor plus 9.14 dB (under range shown when self noise con- tributes ≥ 0.5 dB to the readings). 2. Actual point where the log-linearity exceeds maximum permitted value. Except for very low noise level microphones, the under range level is usually determined by the noise floor plus 9.14 dB. LEARN MORE For more information about measurement range, noise floor, linearity range, and max peak levels as they relate to different microphones and Gain settings, see Table A.2 SLM Performance (Nominal Values) on page A-2. 5.1.3 Understanding Calibration Stability The 831C maintains a stable value of sensitivity over long periods of time. Significant changes in sensitivity, or a pattern of small but regular sensitivity changes, are indicative of problems with the measurement system. To assist you in identifying these situations, the 831C provides 2 notifications: 1. Calibration History Table: Data and date/time of the 10 most recent calibrations 2. Large Change Notifications During calibration, the meter makes an automatic comparison between the sensitivity determined by the calibration and the previous value. A warning appears when the difference between these two values exceeds 3 dB. 5.2 Reviewing the Calibration Settings On your 831C, go to Tools  Calibrate. 831C calibration settings display on the following 4 tabs: • 5.2.1 Calibrate Tab Table 5.1 Input Overload Levels Input Gain, dB Overload Level, dB Peak 0 143 20 123

Reviewing the Calibration Settings 5-3 • 5.2.2 Calibration Settings Tab • 5.2.3 Calibration History Tab • 5.2.4 Calibration Certification Tab 5.2.1 Calibrate Tab When you perform a calibration using any of the known preamplifiers, the SoundAdvisor updates the saved calibration information for that preamplifier. If you install a different preamplifier, the SoundAdvisor applies the previously saved calibration information. As long as the same microphone is being used with that preamplifier, the calibration is accurate. 5.2.2 Calibration Settings Tab FIGURE 5-1 Calibration Settings 5.2.3 Calibration History Tab Select a log entry and a calibration spectra box appears. Select a calibrator. The microphone type, sensitivity, and peak overload values are available on this page The under range and noise floor capabilities. Select the microphone that is installed on your meter. Other: If the microphone type is not found, or in special cases, select Other and manually enter the sensitivity. If your calibrator has unique values, use these fields to manually enter and save them. Sensitivity data prepopulates based on your microphone. The actual value is calculated during calibration.

Reviewing the Calibration Settings 5-4 FIGURE 5-2 Calibration Spectrum 5.2.4 Calibration Certification Tab This page documents when the meter was last certified by the factory, and when it is due for recertification. FIGURE 5-3 Calibration Certification Every calibration is logged as an event in the Calibration History. Delta dB is the difference between the level measured during the current calibration and the level from the previous calibration. Sensitivity is shown in dB relative to 1 V/ Pa. Since space is limited on the meter display, you’ll find a more detailed version of the Calibration History in G4. For more information, see section 1���4 �ali�rati�n �i�t�rie� �a� in the G4 LD Utility Reference Manual. The date of the last certification and the due date for the next certification. The certification interval can be changed to reflect your own certification time line. A reminder will be displayed as a popup � number of days before the interval time has expired.

Choosing a Calibrator 5-5 5.3 Choosing a Calibrator TAKE NOTE If using a 1/4-inch microphone, the 1/4-inch adapter (ADP024, or ADP109) is required. Larson Davis recommends the following calibrator for the 831C: • Larson Davis Model CAL200: 94/114 dB @ 1 kHz. The following instances require a correction: • Using a free-field microphone: For details, see the calibration data shipped with calibrator. • The calibrator and instrument are at a temperature other than room temperature (23° C) or not near sea level. For details, see the calibration data shipped with calibrator. • Always recalibrate your meter when moving it to another location (e.g. meter moved to or from 85 kPa static pressure elevation). 5.4 Calibrating Your SoundAd�isor 831C Step 1 On your SoundAdvisor, go to Tools ��Calibrate. Step 2 Choose your calibrator from the Select Calibrator drop-down menu. LEARN MORE Refer to the calibrator’s user guide for more information. TAKE NOTE For more information on the Other option, see 5.2.2 Calibration Settings Tab. Step 3 Insert the 1/2” microphone into the 1/2” microphone opening at the bottom of the calibrator. Step 4 Turn calibrator on. The calibrator turns off after 1 minute. Use it within that time, or press the button again. Step 5 Select Do Calibration. The 831C calibrates and asks if you want to save the results. Step 6 Select Yes when complete. TAKE NOTE If you see an error message (such as Calibration Out of Range), verify that the calibrator frequency on the calibrator matches the calibration frequency on the meter, and perform the calibration again. Be sure to power the calibrator ON each time.

831C Setup Manager Overview 6-1 Module � Creating a Measurement Setup The 831C makes measurements based on values indicated in a setup file (Setup). Setups are created, edited, and deleted on the Setup Manager tab. This module describes using the Setup Manager on the 831C and in G4, and how to create a custom Setup. To make a variety of measurements for your specific task, define the properties of a Setup, including the following values: In this module: 6.1 831C Setup Manager Overview ............................................................................................... 6–1 6.2 Creating a Custom Setup File ................................................................................................. 6–2 6.2.1 Creating a New Setup File ...............................................................................2 6.2.2 Customizing Setup Values On the Setup Manager Tabs ............................... 3 6.2.3 Choosing a Run Mode .....................................................................................7 6.2.4 Setting Triggers for Exceedances or Events .................................................11 6.2.5 Saving the Setup File ....................................................................................11 6.3 Troubleshooting a Measurement Setup File ....................................................................... 6–12 6.1 831C Setup Manager O�er�iew FIGURE 6-1 Setup Manager Tab Leq, Lmax, Lmin corresponding to user-selected values of frequency weighting and detector Lpeak and Lpeak(max) corresponding to a user- selected value of frequency weighting 1/1 and/or 1/3 octave real-time spectra Six values of Ln based on 6 user-selected values of the percentage parameter n Count of the number of times the levels (SPL and Peak) exceed user-selected values Sound exposure and sound exposure level data The Active setup determines what the next measurement is based on. Highlight the Setup you want to view or edit on the Setup Manager tab, then use the top-left and top-right softkeys to access other the settings tabs. Navigate back to the Setup Manager tab to save your changes. The Default setup, when Set to Active, restores all active properties to factory default values. The Default is a read-only file and can’t be edited or deleted. Shows the current Setup.

Creating a Custom Setup File 6-2 The Setup Manager tab shows all saved Setups on the 831C. On this tab, you can activate or edit any setup file in this list. You can also delete any setup file except for the Active and Default Setups, which persist. 6.2 Creating a Custom Setup File In this section: • 6.2.1 Creating a New Setup File • 6.2.2 Customizing Setup Values On the Setup Manager Tabs • 6.2.3 Choosing a Run Mode • 6.2.4 Setting Triggers for Exceedances or Events • 6.2.5 Saving the Setup File While measurement parameters can be indicated directly in the Active setup, it’s a good practice to save a setup file for each specific measurement you perform. Complete all sections of 6.2 to accomplish this. 6.2.1 Creating a New Setup �ile Before you begin: • Clear the possibility of conflicting settings by setting the LD Default Setup to Active as shown in 6.3 Troubleshooting a Measurement Setup File. Step 1 On the 831C, go to Tools Setup Manager. TAKE NOTE If the 831C is connected to G4 when you load the Setup Manager, the “Setting in use...” dialog box may appear. If you create a setup or make changes on the meter, refresh the list in G4 to sync your changes and override this message. Step 2 Highlight the Default setup in the list and press e. This opens the Setup Manager pop-up menu. FIGURE 6-2 Setup Manager Menu To activate a Setup, highlight that file on the Setup Manager tab, press e, and select Set to Active. To create a new Setup, highlight Default, then click Save As to create the new setup file. You cannot delete or rename the Active or Default Setups. Click Refresh List to update the Setup Manager tab to reflect any changes you’ve made.

Creating a Custom Setup File 6-3 Step 3 Select Save As. This opens the virtual keypad on the 831C. Step 4 Enter a name for your Setup and select OK. Your setup file appears in the Setup Manager list. 6.2.2 Customizing Setup Values On the Setup Manager Tabs Before you begin: • Complete the processes described in all previous sections of 6.2 Creating a Custom Setup File. Step 1 On the 831C, go to Tools Setup Manager. Step 2 Highlight your setup file in the list, then use the top-left and top-right softkeys to navigate and set values on the tabs as shown in the following figures. TAKE NOTE Any changes you make with the Active setup selected won’t be saved in your custom setup. FIGURE 6-3 Setup Manager: �eneral Tab When you select a text field on the 831C, a virtual keyboard appears to enter text. This value will appear as a filename prefix for all measurement data files saved using this Setup. Enter up to 250 characters describing the specifics of this measurement setup. The description appears in the downloaded data files.

Creating a Custom Setup File 6-4 FIGURE 6-4 Setup Manager: SLM Tab About Integration Methods Although the 831C measures levels at all 3 detector and frequency weighting settings, some features require a single combination. The level defined by the detector and frequency weighting you select is used for the computation of Ln, Exceedances, Sound Exposure, and Sound Events (when option 831C-ELA, or 831C-MSR is enabled). The Integration Method setting has 2 options: Linear Integration and Exponential Integration. If you’re unsure which to choose, select Linear. Click on each term to learn more from the ���en�i� � Gl���ary. FIGURE 6-5 Setup Manager: OBA Tab Select a Fre�uency �eighting: (A is the default), Detector (Slow is the default), and Peak �eighting (Z is the default). Your choice for the Detector setting communicates to the meter hardware how quickly it needs to begin measuring the current sound. See also Detector in the ���en�i� � Gl���ary� Select the 20 dB Gain checkbox when measuring low level sounds, or when the sound level is near background noise level. The Running Le� Period is used when the Event History option (831C-ELA) is purchased and enabled on your meter. In this example, the period is the Leq of the last 1200 seconds of the measurement run time. For more information, see Module 17 Using Event History. Normal (107 dB full scale) and High (140 dB full scale) For measurement range specifications, see Table A.6, “Octave Band Analysis 1/1 Octave Linearity Range,” on page 10-A Select 1/1 Octave bandwidth, 1/3 Octave bandwidth, or both simultaneously. Choose a Fre�uency �eight for the 1/1 Octave and 1/3 Octave bandwidth frequency analysis. Spectral Ln values can be measured using 1/1 or 1/3 octave bandwidths. If both 1/1 and 1/3 are selected in the Bandwidth setting, Spectral Ln only measures for 1/3 octaves. For more information about Max Spec (Maximum Specification) values, see Bin Max and At Lmax in the ���en�i� � Gl���ary.

Creating a Custom Setup File 6-5 When using a microphone having a sensitivity of 50 mV/Pa, the input overload will occur approximately as shown in Table 6.1. FIGURE 6-6 Setup Manager: Control Tab FIGURE 6-7 Setup Manager: Ln Percentiles Tab Table 6.1 O�A O�erload Le�els Input �ain� dB OBA Range Overload Level� dB peak 0 High 143 20 High 123 0 Normal 110 20 Normal 90 The Sound Advisor 831C has 6 Run Modes to control the meter during a measurement. For more information on each run mode, see 6.2.3 Choosing a Run Mode. Enter any value from 00.01 to 99.99%. For more information, see ”Ln Value” in the ���en�i� � Gl���ary. You can edit the Ln values and view the calculated value without stopping or pausing the current measurement.

Creating a Custom Setup File 6-6 FIGURE 6-8 Setup Manager: Exceedance Triggers Tab FIGURE 6-9 Setup Manager: Day/Night Settings Tab Although the standard (ISO 1996-2:2007) specifies default values used in the calculation of LDEN, in practice the time values defining the day, evening, and night periods may be changed. This is permitted by Directive 2002/49/EC of the European Parliament and of the Council of 25 �une, 2002, relating to the assessment and management of environmental noise. Because of these recommendations and the versatility of the standard on this point, it’s important to verify these values prior to making the measurement. SPL Trigger Levels: When the measured SPL (Slow, Fast, or Impulse) is greater than the trigger level, the exceedance begins. The measured SPL is defined by the current weighting and detector. Peak Trigger Level: Set 3 peak levels independent of the SPL triggers. Because the peak is associated with Fast detection time, these triggers can identify impulsive noises (e.g., gun shots), which would not normally be measured. Trigger Levels signal exceedances (and events when Measurement and/or Event History is enabled.) LDN is the default day/night level. It’s defined by a specific formula as shown in Day-Night Average Sound Level (DNL, Ldn) in the LDEN is the default day-evening- night level. It’s defined by a formula as shown in Community Noise E�uivalent Level (CNEL, Lden) in the

Creating a Custom Setup File 6-7 FIGURE 6-10 Setup Manager: (Optional) �eather Tab When you install a weather sensor for the 831C (such as SEN031, or SEN032), the Weather Tab is active in the Setup Manager. LEARN MORE For more information about weather accessories, view the SoundAdvisor brochure at www.LarsonDavis.com. Choose your settings as shown in Figure �-10. Once you Close and save the Setup, you can observe the weather readings on the Overall Tab: Weather Page as shown in Figure �-11. FIGURE 6-11 Overall Tab: �eather Page 6.2.3 Choosing a Run Mode Before you begin: • Complete the processes described in the previous sections of 6.2 Creating a Custom Setup File. This section applies only when weather accessories are connected to the 831C. On the Setup Manager Weather tab, set the �eather station type and any other applicable values for the measurement of wind speed, wind direction, temperature and humidity. If the wind speed is above the Threshold, it is considered windy. If Excd. Pause is set to Yes, when the wind speed exceeds Excd. Level, sound exceedances are held off. During a wind exceedance (with sound exceedance paused), the wind speed must drop below the Hysteresis before sound exceedance pause is turned off. “�indy” indicates the wind speed is 36.8% faster than the Threshold level. Red line indicates the compass wind direction.

Creating a Custom Setup File 6-8 On the Control tab, there are 6 Run Modes available. Your choice determines which other settings and features are available. Click on a link below to learn about a run mode. In this section: • Using Manual Run/Stop Mode • Using Timed Stop Mode • Using Stop When Stable Mode • Using Continuous Mode • Using Single Block Timer Mode • Using Daily Timer Mode Using Manual Run/Stop Mode Using this mode, you plan to start and stop the measurement manually. In this mode, the 831C meter preference for Auto-Store determines what happens when you stop the measurement. Step 1 Select Manual Run/Stop from the Run Mode drop-down menu. Step 2 If desired, enable any additional settings on the Control tab, and move to section 6.2.4 Setting Triggers for Exceedances or Events. Using Timed Stop Mode The measurement is initiated manually, and stops automatically after the period you indicate. Step 1 Select Timed Stop from the Run Mode drop-down menu. When combined with the Measurement History feature, these 3 modes can be used to create multiple measurement intervals stored in a data file, with new data files created at regular time intervals. For more information, see 15.1 Setting Up a Measurement With Measurement History. { Recommended for: When you want to manually control when the meter runs and stops. Strength: Custom, live measurement Recommended for: Site surveys Strength: All measurements have the same duration.

Creating a Custom Setup File 6-9 a. Enter the measurement length in the Time (hh:mm:ss) field. Step 2 If desired, enable any additional settings on the Control tab, and move to section 6.2.4 Setting Triggers for Exceedances or Events. Using Stop When Stable Mode Step 1 Select Stop When Stable from the Run Mode drop-down menu. Step 2 Enter values for Delta (dB) and Time as stability parameters. If the parameter is detected, the measurement stops. Step 3 If desired, enable any additional settings on the Control tab, and move to section 6.2.4 Setting Triggers for Exceedances or Events. Using Continuous Mode In this mode, when the meter is powered on, a measurement runs continuously and stores data files according to the Daily Auto-Store value you set. If you set Daily Auto-Store to Never, the meter defaults to your meter preferences for Auto-Store. If a measurement is paused, Continuous mode automatically resumes the measurement after 5 minutes. Step 1 Select Continuous from the Run Mode drop-down menu. a. Select an option from the Daily Auto-Store drop-down, and enter the time of day the data file should be stored in the Time (hh:mm:ss) field. TAKE NOTE At the end of the Auto-Store period, the 831C saves measurement record to a new, incrementally-named, data file throughout the day based on the Time (hh:mm:ss). Time indicates the time of day of the first auto store. TRY THIS If you want to store a data file each hour of the day beginning at 10:05, choose the following settings: • Auto-Store: 1 h Recommended for: on-site or off-site control of a measurement Strength: Measures sound or noise until it changes. Recommended for: continuous noise measurement Strength: Totally autonomous; automatic restart in case of power failure.

Creating a Custom Setup File 6-10 • Time (hh:mm:ss): 00:10:05 If you press Run at 10:10, the measurement record will store at 11:05, 12:05, and so forth. In this case, the initial measurement record will contain only 50 minutes, while all others will contain the full hour. Step 2 If desired, enable any additional settings on the Control tab, and move to section 6.2.4 Setting Triggers for Exceedances or Events. Using Single Block Timer Mode Step 1 Select Single Block Timer from the Run Mode drop-down menu. a. Enter a Start (y-m-d) date and Time, and an End (y-m-d) date and Time, where Time is the time of day. Step 2 If desired, enable any additional settings on the Control tab, and move to 6.2.4 Setting Triggers for Exceedances or Events. Using Daily Timer Mode Use Daily Timer mode to schedule one or more measurements, which start and stop according to the time you set, every day until the End date. Step 1 Select Daily Timer Mode from the Run Mode drop-down menu. a. Enter a Start (y-m-d) date and Time, and an End (y-m-d) date and Time, where Time is the time of day. b. If desired, select the checkbox in-line with 2, and 3 to enter additional measurement periods. Recommended for: unmonitored measurements Strength: One measurement automatically starts and stops at the date and time you set. Recommended for: Work area surveys which follow a worker’s daily schedule and account for breaks. Strength: Totally autonomous, daily intermittent measurement for long or short number of days.

Creating a Custom Setup File 6-11 Step 2 Enable any additional settings on the Control tab, and move to 6.2.4 Setting Triggers for Exceedances or Events. 6.2.4 Setting Triggers for Exceedances or Events When the sound level (defined by the time weight and detector you choose on the SLM page in the Setup Manager) exceeds the preset level, the meter logs the number of times and the total time the level was exceeded. These exceedances are reported on the Live Tab Triggering Page and on the Overall Tab Exceedances Page. Before you begin: • Complete 6.2 Creating a Custom Setup File. Step 1 On the 831C, go to Tools Setup Manager, and press the right softkey (//*)until the Exceedance Triggers tab appears. Step 2 Set the applicable trigger levels. Step 3 If desired, enable any additional settings on the Setup Manager tabs and move to section 6.2.5 Saving the Setup File. 6.2.5 Saving the Setup File Before you begin: • Complete the previous processes beginning with 6.2.1. Step 1 To save your Setup and exit the Setup Manager, select Close (/*/). Step 2 In the Save dialog, choose Yes to save the changes you’ve made. Step 3 Press the Menu softkey (/*/) to return to the Setup Manager Page. Step 4 Highlight and press ENTER on the name of the custom Setup you created. Step 5 In the pop-up menu that appears, Set to Active is highlighted. press ENTER to select that option. The next measurements will run according to the Setup you just created. TAKE NOTE You can also complete the setup process in G4 LD Utility, which provides a simple, file transfer-style interface for configuring, saving, and transferring Setup files to your PC or to another meter. To use the Setup Manager in G4, select your meter in the Meters Panel, and click Setup Manager. For more information, refer to the G4 LD Utility Reference Manual at the following location: G4  Help Manuals.

Troubleshooting a Measurement Setup File 6-12 6.3 Troubleshooting a Measurement Setup File Setting the LD Default measurement setup as the Active setup can clear the meter when it’s doing something unexpected and you don’t know why. Step 1 On the meter, select Menu  Setup Manager. Step 2 Select Default by highlighting it, then pressing e. This opens a pop- up menu. Step 3 Highlight, select Set to Active, and confirm your choice if required. Step 4 Press the Close softkey to save the meter settings.

Before You Start 7-1 Module 7 Making a Measurement Making a measurement on the 831C can be as simple as viewing a live reading of the area using the Big Digit display, or as sophisticated as setting it up with environmental accessories, deploying it in the field, and logging measurements when the sound level is above 80 dB over the course of many months in all weather conditions. For both tasks, understanding the basics of measurement making is essential. Quick Measurement Steps: Step 1 Power On the 831C. Step 2 Navigate to Overall display. Step 3 Press Run 9. Step 4 When finished, press Stop 7. Step 5 Press Store 7 and save your data file. In this module: In this module: In this module: In this module: In this module: In this module: In this module: 7.1 Before You Start ...................................................................................................................7-1 7.1.1 Position the 831C ..................................................................................................7-2 7.1.2 Performing an Area Sound Field Check ...............................................................7-3 7.2 Performing the Measurement .............................................................................................7-4 7.2.1 Pausing the Measurement ....................................................................................7-5 7.2.2 Resetting a Measurement .....................................................................................7-7 7.2.3 Stopping the Measurement ..................................................................................7-7 7.3 Storing the Measurement ...................................................................................................7-7 7.1 Before You Start Before performing a measurement, follow these steps to ensure the measurement is performed properly: LEARN MORE Each step has a link to the first 6 Modules in the manual, and if read through, will lead to optimal performance of the 831C.

Before You Start 7-2 Step 1 Connect preamplifier and microphone to the 831C. For complete instructions, see 3.3 Connecting the Preamplifier to Meter. Step 2 Turn meter On 0. For complete instructions, see 3.6 Powering On or Off. Step 3 Navigate to Tools Setup Manager and indicate or check all values desired for your measurement. For complete instructions, see 6.2 Creating a Custom Setup File. Step 4 Calibrate the meter. For complete instructions, see 5.4 Calibrating Your SoundAdvisor 831C. 7.1.1 Position the 831C The best position for sound recording is to mount the 831C on a tripod. If held in hand, position your body away from and on an angle to the meter to minimize interference of the sound field at the microphone resulting from body reflections. The microphone should be angled away from the body. If using a free-field microphone like the 377B02, the meter should be “pointed” at the sound source being measured. FIGURE 7-1 Optimal Hand Held Position (Free-Field Mic) Microphone Extension Cable TAKE NOTE Always position the preamplifier/microphone in a way to minimize the effect of reflections on the sound field near the microphone. A shielded microphone extension cable may be placed between the meter and the preamplifier/microphone if needed for the measurement position. No correction is necessary when using Larson Sound Source

Before You Start 7-3 Davis Model EXCXXX microphone extension cables in combined lengths up to 200 feet. XXX is the length in feet (XXX = 010, 020, 025, 035, 050, 060, 100 and 200) available. Windscreen Wind blowing across the microphone generates pressure fluctuations on the microphone diaphragm which can produce errors in the measurement. As a result, when performing measurements in the presence of low level airflows, we recommended that you place a windscreen over the microphone and preamplifier. Larson Davis provides the WS001 windscreen, which is a 3 ½-inch diameter ball made of open cell foam. FIGURE 7-2 WS001 Windscreen 7.1.2 Performing an Area Sound Field Check Starting a measurement during a dramatic sound change can affect your data in an unwanted way. Before starting any measurement, it’s a good practice to briefly monitor the area sound. Step 1 On the meter, observe the current sound readings on the Live tab as shown in Figure 7-3. Because the windscreen can protect the microphone from accidental damage, we recommend using it even when measuring indoors.

Performing the Measurement 7-4 FIGURE 7-3 Standard Area Sound Before Measurement LEARN MORE For more detail about the information displayed here, see 4.1.1 About the SLM Page (Live Tab Page 1). 7.2 Performing the Measurement Before you begin: • Charge or provide uninterrupted power for your meter for the measurement duration. For details, see 3.5 Powering the 831C SLM. • Create a measurement setup file for this measurement as shown in Module 6 Creating a Measurement Setup. • Complete an Area Sound Field Check as shown in 7.1.2 Performing an Area Sound Field Check. Step 2 Navigate to Overall on the 831C and press RUN �. �eypad LED Indicators When performing a measurement, the state of the 831C is indicated in several ways: measurement state icon, Overall display animation, and the red and green illumination of the STOP/STORE and RUN/PAUSE keys. The time reads 00:00:00.0 on both the Live and Overall displays. (Otherwise the previous measurement was not stored or reset.) The measurement status icon is set to Stop. The live sound is steady and within range. Table 7.1 Measurement State LED Indicators Measurement State Red LED � �reen LED � Stopped Winking ��-�-� Off Paused Flashing �-�- Flashing -�-� Running Off Winking ��-�-�

Performing the Measurement 7-5 LEARN MORE To learn more about the displays and icons, see 2.3 Display Elements Overview. The Measurement Range The measurement ranges over which the 831C meets the standards depends upon the selected frequency weighting. Measurements which include levels outside this range should not be considered accurate. An overload indication will appear when levels are above the range. However, it isn’t recommended to rely on measurements where the levels are below the lower limit of the specified range. Overload As part of the calibration procedure, the overload level (dB Peak)for A, C, and Z weighting is determined for the current instrument setup and microphone/preamplifier. When the sound pressure level is higher than the calibrated overload level, the input overload icon flashes while the condition exists. Under Range When the sound pressure level is lower than the meter’s noise floor (the noise level of the instrument and the preamplifier), the Under Range icon flashes while the condition exists. �.2.1 Pausing the Measurement TAKE NOTE A measurement may be paused and resumed multiple times. At any time the measurement of overall data can be temporarily paused. During a pause, the run clock will not stop and instantaneous data will continue to be displayed on the Live display. After a pause, press the � RUN/PAUSE key to resume the measurement. The overall data will not be affected by any acoustic events occurring during the time period that the 831C was paused. Using the Back Erase Feature The 831C has a back-erase feature that allows for a quick erase of the last 5 to 10 seconds of measured data. This feature is used to erase sounds that are recorded, but not wanted in the overall measurement. Waiting for valid data to begin running Delayed wink ----� Off Table 7.1 �Continued�Measurement State LED Indicators Measurement State Red LED � �reen LED �

Performing the Measurement 7-6 Enable Back�Erase Feature The back erase is visible on the Overall page, when the measurement is paused, and only after the measurement has run more than 5 seconds since the last run or resume. The back erase feature is unavailable when any of the following have been enabled in the Active setup: TAKE NOTE Pressing any other key besides the back-erase option will end the back-erase state. • Measurement History • Event History • Spectral Ln • Event Sound Recording FIGURE 7-4 Using 831C Back Erase Session Log The session log will have an icon to indicate data had been erased. FIGURE 7-5 Back Erase in the Session Log The Back Erase feature is located where Menu typically is. After the first erase, you can erase an additional 5 seconds (not an additional 10). Undo appears as an option after a 10 second erase. To close Back Erase, start a run again or Stop the measurement. Back erase icon will appear when a part of the measurement was erased during a pause. The amount of time that was erased will be shown in the information box.

Storing the Measurement 7-7 Time History Records The time history starts from the time the data was restored. The erased data will be marked as Back Erase as the record type. FIGURE 7-6 Measurement Data for Back Erase �.2.2 Resetting a Measurement CAUTION The measurement data will be lost if not saved. Additionally, saved data will not be lost during a reset. A measurement often needs to be reset when a radical noise event takes place that is unnecessarily recorded in your data. For example, an aircraft passing overhead when attempting to measure the background noise in a normally quiet area. CAUTION If a reset happens while a measurement is run- ning or paused, the 831C will automatically stop the mea- surement for the reset, and data will be removed. To reset a measurement in progress, stop the measurement then press the 1 (RESET) key. This will erase all data previously measured and reset the run time clock to zero. A reset will not reset stored data files, only the current run. A reset can be initiated when the 831C is running, paused, or stopped. �.2.3 Stopping the Measurement The 831C can be stopped during a run or a pause, and will stop the run clock. Resuming a run will continue the overall measurement which has been stopped. The run clock will also begin again from the time indicated when the stop occurred. 7.3 Storing the Measurement Step 1 Press the Stop � button to stop the measurement. TAKE NOTE You cannot save a file with the same name as a currently saved data file. If you want the new data file to replace the old data file, you will need to rename or delete the old file first. See Module 8 Managing Measurement Data Files. Step 2 Press the Store � button (unless your preferences are set to Auto-store, then the first Stop will store or prompt to store). Step 3 You will be prompted to save the file. You can change the name of the data file by highlighting the name and pressing ENTER 5. This displays the virtual keypad. When finished entering the name, select Yes to save.

Setting Data File Storage Preferences 8-1 Module 8 Managing Measurement Data Files Each time you manually or automatically store measurement results, a new data file is created or appended and saved to the location you specify. While the 831C has 1.8 GB of available internal memory, USB, and cloud storage options are also available. In this module: 8.1 Setting Data File Storage Preferences ................................................................................8-1 8.2 Using the Data File Manager ...............................................................................................8-2 8.2.1 Viewing a Measurement Data File ........................................................................8-3 8.2.2 Using Load Settings ..............................................................................................8-4 8.2.3 Using Create Average ............................................................................................8-4 8.3 Saving, Moving, or Copying Data Files ...............................................................................8-5 8.3.1 Setting a Data File Storage Location ...................................................................8-5 8.3.2 About Data File Naming Conventions ..................................................................8-7 8.3.3 Moving or Copying Data Files to a USB Drive ......................................................8-7 8.1 Setting Data File Storage Preferences On the Meter Preferences page, the Auto-Store and Data Storage settings allow you to indicate where, when, and how you want the meter to react when a measurement stops and it’s time to store a measurement record. Step 1 On your 831C, navigate to Tools  System Properties  Preferences. Step 2 Choose an option from the Auto-Store drop-down menu: Choosing an Auto-Store Meter Preference The Auto-Store meter preference allows you to choose what happens when a measurement stops. • None: All storage must be done manually, unless in the continuous daily auto-store mode indicated in a setup. • Prompt: When you press the 7 Stop button, or a stop occurs, you are prompted to save the measurement data file. We recommend this setting for manual measurements only. • Store: A measurement is automatically stored when a measurement is stopped.

Using the Data File Manager 8-2 The following Table shows the result of each choice and its relation to the run mode you choose and a manual or timed stop. FIGURE 8-1 Preferences Page LEARN MORE For more information about saving a file to the USB drive see 8.3.3 Moving or Copying Data Files to a USB Drive. LEARN MORE For more information about enabling SFTP or cloud storage, see 9.12 Setting Up Cloud Storage for Data Files. 8.2 Using the Data File Manager The Data File Manager is a directory of all saved data files. Only one user at a time can perform actions on data files. If a user is in the Data File Manager and a another attempts to open it, the second is Table 8.1 Auto�Store Preference and Stop Method Run Mode Type of Stop Auto�Store Preference (Prompt/Store) Timed Stop Timer final stop Prompts at timer’s end Stores automatically Manual stop Prompts when stopped Stores automatically Stop When Stable Timer stop Prompts when stable Stores automatically Manual stop Prompts when stopped Stores automatically Single Block Timer Timer stop Prompts at timer’s end Stores automatically Manual stop Prompts when stopped Stores automatically Daily Timer Timer stop Prompts at timer’s end Stores automatically Manual stop Prompts when stopped Stores automatically Manual — Prompts when stopped Stores when stopped Continuous Interval stop Follows Daily Auto-Store settings Manual Prompts when stopped Stores when stopped Your data file can store to the internal memory, a USB drive, both, or to a cloud storage account. The Auto-Store meter preference options include: Prompt, Store, None.

Using the Data File Manager 8-3 prompted to end the first user’s session before they can begin their own. On the 831C, go to Tools �  Data File Manager. FIGURE 8-2 Data File Manager Overview FIGURE 8-3 Using the Data File Manager Menu �.2.1 Viewing a Measurement Data �ile Step 1 Navigate to Tools �  Data File Manager. Step 2 Highlight your desired data file, press Menu (//*), then choose View. This opens a read-only display of the Overall and Session Log tabs, which show that measurement record. To indicate that you are seeing a A USB drive is inserted, so the USB icon is displayed. The current measurement can be running, paused, or stopped while viewing data files. This number refers to the available internal storage unless a USB drive is connected and set for store- only. Then it refers to the USB storage space. The name includes the Filename prefix you defined in the measurement setup file. This data file is stored in 2 locations. The top file is saved on the USB drive, and the bottom file is saved on the meter’s internal memory. 1. Highlight a data file. 2. Select Menu (//*). 3. Choose an option from the pop-up Menu. Your choice affects the highlighted data file. Regarding data files stored on the 831Cs internal memory, you can Rename, Delete, and Delete All Internal Files. You can also use these Menu items to navigate the data file list: Refresh List, �ump to Beginning, �ump to End.

Using the Data File Manager 8-4 measurement data file and not the live data, the data file icon appears next to the data file name. �.2.2 Using Load Settings From your selected data file, you can load the measurement settings used to create the selected data file into the Active setup. Before you begin: • Save your current Active settings to a new Setup file, if needed. Settings in the Active setup will be lost. • Stop any measurement currently running or paused. Step 1 On the 831C, go to Tools � Data File Manager. Step 2 Highlight the desired data file. Step 3 Press Menu, and select Load Settings from the pop-up menu. (No confirmation appears.) Step 4 Close the Data Manager, go to Menu  Setup Manager� and confirm settings in the Active Setup. �.2.3 Using Create Average Create Average takes a saved data file and adds its average as an instance to the unsaved Overall measurement. • CAUTION: Any unsaved measurement will be overwritten with the new average instance. • You can add multiple files to the average. Each appears as a new instance in the overall measurement. However, each file can only be added once. • A measurement can run after the averages are loaded. But this isn’t recommended for averaging purposes. • After data files are averaged, you can save the new data as a single file. Follow these steps to create an average of your data file(s): Step 1 Navigate to Tools �  Data File Manager�

Saving, Moving, or Copying Data Files 8-5 Step 2 Highlight the desired data file. Step 3 Select Menu (//*). Step 4 Select Create Average from the pop-up menu. Step 5 Highlight a different data file, and select Menu. Step 6 Select Add to Average from the pop-up menu. Step 7 Repeat steps 5–6 until all data files you want to average have been added. Step 8 Close the Data File Manager and navigate to the Overall display to view the average data. Step 9 To save the averaged data file, press Stop/Store 7. 8.3 Saving, Moving, or Copying Data Files In this section: • 8.3.1 Setting a Data File Storage Location • 8.3.2 About Data File Naming Conventions • 8.3.3 Moving or Copying Data Files to a USB Drive 8.3.1 Setting a Data File Storage Location Use the meter preferences to indicate where your future measurement data files should stored. To provide a rough approximation of file size and required storage space, the size of a basic measurement data file is about 42.5 KB. In this section: • Saving Data to the Internal Memory • Saving Data to a USB Drive • Saving Data to USB Backup • Saving Data to SMTP or Cloud Storage Saving Data to the Internal Memory On your 831C, go to Tools System PropertiesPreferences. When you select Internal, data files saved manually and via auto-store save to the meter’s 1.8 GB internal memory. Depending on the content and frequency of your measurements, this internal memory may quickly fill.

Saving, Moving, or Copying Data Files 8-6 About the Out of Memory Error When the amount of remaining internal memory reaches 10 MB, in order to ensure that all measured data can be stored, the 831C stops automatically. If the unsaved data is less than 800 kB, press the Stop/ Store button 7 to save it. Before you begin another measurement, download all data to an external drive or PC by using the Data File Manager or G4 LD Utility. • For information about copying files to USB, see 8.3.3 Moving or Copying Data Files to a USB Drive. • For information about moving internal files to a PC via G4, see the G4 LD Utility Manual. Saving Data to a USB Drive On your 831C, go to Tools System PropertiesPreferences. When you select USB from the Data Storage drop-down menu, data files saved manually and through auto-store save to the inserted USB drive. If there’s no USB drive in the 831C, the USB not available icon displays in the Status bar, and data files save to the 831C internal memory. Saving Data to USB Backup On your 831C, go to Tools System PropertiesPreferences. When you select USB Backup from the Data Storage drop-down menu, data files save to both the 831C internal memory and the inserted USB drive as a backup copy. If the internal memory becomes full, data files save to the USB drive. (See About the Out of Memory Error) Saving Data to SMTP or Cloud Storage See 9.12 Setting Up Cloud Storage for Data Files.

Saving, Moving, or Copying Data Files 8-7 �.3.2 About Data �ile Naming Conventions In addition to manually naming a data file, there are 2 conventions the 831C uses to automatically generate unique file names. These are a product of the run mode indicated in a setup. �a�le ��� contains details and examples. LEARN MORE For more information on continuous auto store, see section 6.2.3 Using Continuous Mode. �.3.3 Moving or Copying Data �iles to a USB Drive Complete this section to move or copy a data file from internal memory to a USB drive. Step 1 Insert a USB drive in the 831C. Wait for the USB icon to appear in the meter Status bar (about 10 seconds). If the Data Storage setting is set to USB, but no USB drive is inserted, the USB not available icon appears. Files save to the internal memory until you insert a USB drive. Table 8.2 Data File Naming Con�entions Run Mode File Naming Convention Example Additional Information Manual Stop “Default Data File”.NNN 831�Data.001 The “Default Data File” can be changed on the General setup page. NNN represents single digits that increment sequentially from 001–999, then reset to 001 to create a unique filename. Continuous- Up to 48 daily auto- stores per day (choose a period: range from every 24 hr–30 mins) YYMMDD��.LDO 18031401.LD0 The filename is 12 characters and includes the year, month, and day followed by 2 digits. The values of �� increment from 00 –99 to create a unique filename. Continuous- Stores Every 15 mins or 10 mins YYMMDD��.LD0 1610110A.LD0 The filename includes the year, month, and day followed by a hexadecimal number that increments from 00–FF to create a unique filename. Continuous- Stores every 5 mins, 3 mins, or 2 mins YYMMDD���.LD0 181205AA6.LD0 Filename is 13 characters: the year, month, and day followed by 3 alphanumeric values that increment from 000–FFF to create a unique filename.

Saving, Moving, or Copying Data Files 8-8 Step 2 Go to Tools �  Data File Manager. Step 3 Highlight the desired data file, and press Menu (//*). Step 4 Select one of the following actions from the pop-up menu: • Copy File to USB The data file will be copied onto the USB drive. The original file will remain saved on the 831C. • Move File to USB The original data file moves from the internal memory to the USB drive. • Copy All Internal to USB Copies of all data files on the 831C are saved to the USB drive. The original data files remain saved in internal memory. • Move All Internal to USB All original data files move from the internal memory to the USB drive. The internal memory is blank. Step 5 Examine the Data File Manager to confirm the desired action. TAKE NOTE If the USB drive is removed during a measurement, the USB not available icon appears, the measurement ends, and data with that measurement is not visible on the meter. When the USB drive is reinserted, the USB caution icon appears. The meter notifies you that there is unsaved data and prompts you to Save or Delete the measurement data. You cannot continue with the same measurement.

Setting Instrument Identification 9-1 Module 9 System Properties This module is a reference for 831C system properties and settings. You can also adjust 831C system properties in G4. For more information, see section A.2 in the G4 LD Utility Manual. In this module: 9.1 Setting Instrument Identification .......................................................................................9-1 9.2 Updating the Meter Time ....................................................................................................9-1 9.3 Using NTP to Sync the Meter Clock ....................................................................................9-2 9.4 Editing Power Settings ........................................................................................................9-3 9.5 Setting Meter Preferences ...................................................................................................9-6 9.6 Setting Localization Options ..............................................................................................9-7 9.7 Setting Options On the Displays Tab ..................................................................................9-8 9.8 Enabling or Disabling Options ............................................................................................9-9 9.9 Setting Network Preferences ..............................................................................................9-9 9.10 Setting Up Alert Notifications .............................................................................................9-9 9.11 Setting System Alert Notification Details .........................................................................9-12 9.12 Setting Up Cloud Storage for Data Files ...........................................................................9-14 9.13 Utilizing the Logic In, Logic Out Feature ..........................................................................9-15 9.14 Setting Reference Spectra ................................................................................................9-16 9.15 Generating an App Password ...........................................................................................9-17 9.1 Setting Instrument Identification On your 831C, go to Tools System PropertiesDevice. Enter 30 characters per field of device information that will appear on the Tools About page and in alert notifications. 9.2 Updating the Meter Time On your 831C, go to Tools System PropertiesTime.

Using NTP to Sync the Meter Clock 9-2 There are several ways that you can update the time on the meter: by using GPS, NTP servers, PC clock, or by manually setting the time. This page is designed to be manually updated. However, when your time zone is set accurately, the time automatically updates for Daylight Savings time. FIGURE 9-1 Set Date/Time & Timezone TAKE NOTE To sync the 831C with the time on your PC, go to G4 LD Utility Meter Manager  Maintenance tab. For more information refer to the G4 LD Utility Reference Manual. 9.3 Using NTP to Sync the Meter Clock The 831C communicates with NTP servers to sync the internal clock with the most accurate time. This requires a valid Internet connection through Ethernet, wireless modem, or WiFi. Before you begin: • Set the correct Time Zone (Menu  System Properties  Time). Step 1 On the meter, go to System Properties  NTP. Stop the measurement before setting time, otherwise the time waits to update until the next Stop. Set your time zone first then select Save. If you have NTP time it is not necessary to set this. If you want to manually set time and override any syncing, adjust this and select Set Time. Close and select Yes to save your changes.

Editing Power Settings 9-3 Step 2 Enter the Primary and Secondary NTP Time Servers. FIGURE 9-2 NTP Servers When your time is successfully synced with NTP servers, the NTP icon appears in-line with the current time on the Live and Overall tabs. 9.4 Editing Power Settings On your 831C, go to Tools System PropertiesPower to edit the following settings (click on a section below to learn more): • 9.4.1 Changing Batteries and Editing the Battery Type • 9.4.2 Setting Auto-Off • 9.4.3 Using Analog Power-Save Mode • 9.4.4 Setting the Backlights On Period • 9.4.5 Enabling or Disabling the Keypad Backlight • 9.4.6 Setting the External Shutoff Voltage FIGURE 9-3 Power tab 9.4.1 Changing Batteries and Editing the Battery Type On your 831C, go to Tools System PropertiesPower. If you’ve synced with NTP and lose the Internet connection, the 831C attempts to reconnect to servers for up to 2 ½ hours. During this time the NTP icon persists. If the servers cannot be reached after that time, the 831C stops trying to reconnect and the NTP icon is removed. Set your Battery Type and Charge preference each time you change batteries to prevent damage or fire.

Editing Power Settings 9-4 When changing batteries, the Battery Type must match the type of batteries you’re installing. The 831C can be powered by alkaline, 1.5V lithium, or nickel-metal hydride (NiMH) batteries. CAUTION Do not mix alkaline and NiMH batteries. CAUTION Do not mix batteries from different manufacturers. CAUTION Do not replace only 1, 2, or 3 batteries. Replace all 4 batteries when installing fresh cells. CAUTION Do not change the batteries without also setting the Battery Type (as shown in this section). To prevent serious damage, injury, or fire, edit the Battery Type setting each time you install a different type of battery. When the battery type is set to NiMH, the internal charger is enabled. This can result in fire or injury with alkaline or lithium batter- ies. Step 1 On your 831C, go to Tools System Properties. Step 2 Press the top-right softkey until the Power tab appears. Step 3 Select the Battery Type that matches the batteries you’re installing. Step 4 Install 4 new batteries. For details, see 3.5.1 Using Battery Power. Step 5 If you’ve installed NiMH batteries and want to charge them in the meter, enable the Charging feature. Enabling Charging for NiMH Batteries a. From the Charge drop-down, select On. b . Use the included USB cable to connect to a wall outlet. For best results, turn the meter off while charging. LEARN MORE For battery power and usage details, see 3.5.1 Using Battery Power. 9.4.2 Setting Auto-Off On your 831C, go to Tools System PropertiesPower. Auto-Off is the period the instrument stays on with no activity. Any of the following actions keep the meter on and restart the Auto-Off period: • Button press • Running a measurement • USB communication • Remote communication Pressing the 0 (ON / OFF) key returns the instrument and the display to the state it was in when the Auto-Off time expired.

Editing Power Settings 9-5 9.4.3 Using Analog Power-Save Mode On your 831C, go to Tools System PropertiesPower. Power-Save mode is indicated by the sleep icon . When the meter is not running, this mode can significantly conserve battery power, since it shuts down the meter’s analog circuitry and signal processing activities. From the Power-Save drop-down menu, select the period the instrument should stay powered after a measurement has stopped. The analog circuitry, including power to the preamplifier, shuts down when the instrument is stopped for the period you chose. Performing a calibration, a reset, or starting a measurement restores power. The meter can run the measurement after a short 10 second power-up. 9.4.4 Setting the Backlights On Period On your 831C, go to Tools System PropertiesPower. Backlights On is the duration the 831C display is back lit after the last key press. Selecting Always slightly increases power consumption. 9.4.5 Enabling or Disabling the Keypad Backlight On your 831C, go to Tools System PropertiesPower. The blue LEDs under the keypad can be enabled or disabled according to your preference. The Red LED behind the STOP/STORE button, and the green LEDs under the RUN/PAUSE and ON/OFF buttons are always enabled. TAKE NOTE Increasing the back light brightness significantly increases the meter’s power consumption, which decreases battery life. Additionally, you can select the LCD screen back light intensity as a percentage. When battery life is below 10%, the 831C overrides this setting and downgrades the LCD Brightness to 50%. If the user-defined setting is below 50% brightness, it remains the same. 9.4.6 Setting the External Shutoff Voltage On your 831C, go to Tools System PropertiesPower. If desired, you can customize the external shutoff voltage. When the voltage of an external battery drops below this value, the 831C shuts off to prevent damage to the external batteries. LEARN MORE The default voltage is 10.8 volts. To customize this setting, enter a value between 10–25 volts if your battery usage is other than a standard 12V SLA battery. For more information, see Table A.3 on page 5.

Setting Meter Preferences 9-6 9.5 Setting Meter Preferences On your 831C, go to Tools System PropertiesPreferences to edit the following settings (click on a section below to learn more): • 9.5.1 Setting a Microphone Correction Value • 9.5.2 Enabling or Disabling AC Output • 9.5.3 Enabling the Reset Prompt • 9.5.4 Setting the Data Storage Location • 9.5.5 Enabling GPS Mode • 9.5.6 Customizing the Display Color Theme 9.5.1 Selecting a Microphone Correction The 831C can automatically apply corrections to a measurement to account for an environmental shroud or a specific microphone as shown in this section. Step 1 On your 831C, go to Tools System PropertiesPreferences. Step 2 Select a option from the Mic Correction drop-down menu. For Mic Correction options, the 2 characters before the colon represent the physical mic type. The 2 characters following the colon represent the desired response. For example: if my mic is a free-field mic in an EPS2116 with an environmental protection device and I want a 90 degree response, I would select FF:90 2116. Table 9.1 Microphone Correction Options Option Current Microphone Simulates Off No Correction RI:FF Random Incidence Free-Field FF:RI Free-Field Random Incidence FF:RI 2016/8 Free-Field with EPS2106 Random Incidence FF:FF 2016/8 Free-Field with EPS2106 Free-Field FF:90 2016/8 Free-Field with EPS2106 90-degree measurement FF:RI 2116 Free-Field with EPS2116 Random Incidence FF:FF 2116 Free-Field with EPS2116 Free-Field FF:90 2116 Free-Field with EPS2116 90-degree measurement

Setting Meter Preferences 9-7 9.5.2 Enabling or Disabling AC Output FIGURE 9-4 831C AC/DC Output On your 831C, go to Tools System PropertiesPreferences. The AC/DC Output is a full dynamic range AC/DC output that can be turned On or Off. The AC continually receives samples from the ADC. It has output while the ADC is on and stops during power-save. The DC level is your configured Lωτ level while running. The AC/DC output does not drive a headset or headphones. 9.5.3 Enabling the Reset Prompt On your 831C, go to Tools System Properties. Whenever you make a measurement that you don’t want to keep, press the 1 Reset button to clear the unsaved data. When you select the checkbox in-line with Reset Prompting, the meter requires you to confirm your choice before clearing the data. We recommend enabling this feature. 9.5.4 Setting the Data Storage Location Use this feature to indicate where your data files are stored. On your 831C, go to Tools System PropertiesPreferences. LEARN MORE See 8.3 Saving, Moving, or Copying Data Files. 9.5.5 Enabling GPS Mode On your 831C, go to Tools System PropertiesPreferences. If you want to attach a GPS device through the Aux port, select On from the GPS Mode drop-down. 9.5.6 Customizing the Display Color Theme On your 831C, go to Tools System PropertiesPreferences.

Setting Localization Options 9-8 The 831C LCD screen has 6 color theme options: 3 light and 3 dark. We recommend the light screens when you’re operating the meter in sunlight or outdoor settings. We recommend the dark themes for indoor or low-light use. FIGURE 9-5 Available 831C Color Themes 9.6 Setting Localization Options To access these settings on the meter, go to ToolsSystem PropertiesLocale. Selecting a Language The 831C has a built in language translation feature, and you can set your language preference. The following languages are available: English, French, German, Italian, Portuguese (PT & BR), Norwegian, Spanish, Swedish, Czech, Turkish, Chinese, and Thai. Selecting a Decimal Symbol Depending on your preference, select a period or a comma for the decimal place, and save your change. Selecting a Date Format Select one of the 2 available date formats: dd-mm-yyyy and yyyy- mm-dd. For example: 2017-02-14. Save your change. Setting a Unit of Measurement The default unit of measurement for the 831C is SI (International System of Units). However you can also select English units. Make your selection and save the change. 9.7 Setting Options On the Displays Tab To access these settings on the meter, go to ToolsSystem Properties Displays. Customizing the Start Display Start refers to the display that you see when you boot up the 831C. Select your option from the drop-down, save, and close. Your new start display appears on the next power up.

Enabling or Disabling Options 9-9 Customizing Tab & Page Display Select an option from the Tabs drop-down menu, then select the checkbox in-line with items in the Pages list that you want to display. Deselected pages are hidden not deleted. FIGURE 9-6 Display Options 9.8 Enabling or Disabling Options TAKE NOTE Default options don’t appear in the list since they cannot be disabled. Step 1 On your SoundAdvisor 831C, go to Tools System Properties. Step 2 Press the top-right softkey until you see the Options Screen. Step 3 Select the checkbox in-line with the options you want available in the 831C interface. TAKE NOTE Disabling an option in this section does not delete the option. You can select it again at anytime. Step 4 Reboot the meter. 9.9 Setting Network Preferences See 13.3 Setting a Static IP Address. 9.10 Setting Up Alert Notifications The 831C can be set up to send email and text alerts for a variety of system events, as well as measurement and sound events by using the System Properties email preferences. When an event (setting change, exceedance trigger, sound event, etc) occurs and the meter has an active network connection, the meter sends the alert notification after the event has concluded. To set up alert notifications for system-, event-, and measurement history-triggered events, follow these steps:

Setting Up Alert Notifications 9-10 Before you begin: • Create an email account on an email server that supports secure email. • We recommend that you use 2-Step Verification when using Google. If you choose this option, see 9.15 Generating an App Password. • To avoid spam filters, add the host email addresses to your contact list. • When the meter is configured with a static IP address, you will need to configure your network settings as shown in 13.3 Setting a Static IP Address. Step 1 Navigate to Tools System Properties  Email. Step 2 Enter a Hostname for your mail server and a Username and Password for your mail account. FIGURE 9-7 Email Preferences Screen Step 3 Select the Security level for the account. TLS Trusted CA (preferred) The 831C matches responding server with a provided certificate to verify that the responding server is known. If the responding server can’t be verified, the email will not send. Most email providers (such as Gmail) use this type of security. To (Text) field sends a plain text email, or text message (when configured for the following mobile carriers: AT&T: [email protected] T-Mobile: [email protected] Sprint: [email protected] pcs.com Verizon: [email protected] Virgin Mobile: [email protected]

Setting Up Alert Notifications 9-11 TLS On Certain configurations use their own method for validating that an email server is the correct server—such as the US military. Use this setting when instructed by your IT department. TLS Off This is option uses only a login name and password to access an email server. This method is not secure, and we don’t recommend it. Step 4 If desired, enter a Reply-to email address. This is displays as the “From” address in the alert notifications. If someone replies to an email from 831C, this is where the email will send. Step 5 Indicate the To (Email) where you want to receive HTML-based email notifications. Step 6 In the To (Text) field, enter an email address or SMS-enabled phone number where you want to receive text notifications. See Figure 9-7. Step 7 Click Send a Test Email. If you don’t receive a notification within a few minutes of initiating a test, check to see if your meter is connected to the Internet. Also, make sure a proxy is not filtering your email. For additional questions or troubleshooting, contact your local IT support. Step 8 Click Close (/*/) to save your settings and exit the menu. 9.10.1 Enabling Alert Notifications for Sound Events Step 1 Create an Event History-enabled measurement Setup as shown in section 17.1 Setting Up the Event History Measurement. Step 2 Enable notification alerts in the Setup, and make it the Active setup. For more information, see 17.1 Setting Up the Event History Measurement. TRY THIS With firmware option 831C-MSR, or 831C-SR installed, you can also choose sound recording settings in your measurement setup file. To send a sound recording of the exceedance (in WAV or OGG format), go to Tools  Setup Manager  Sound and select Save Event Sound. For the full process, see 18.3 Making an Automated Event Sound Recording. Step 3 Run a measurement and trigger an event. TAKE NOTE The alert notification sends after the event and any continuation period passes. The arrival time of the notification may also be impacted by Internet performance.

Setting System Alert Notification Details 9-12 FIGURE 9-8 Example Sound Event Alert Notification Email 9.11 Setting System Alert Notification Details In this section, select which details you want to include in the alert notification. Before you begin: • Complete the process shown in 9.10 Setting Up Alert Notifications. Step 1 On your 831C, go to Tools System Properties  Alerts and select from the following options: Settings When you change any setting or preference on the meter, the 831C sends an alert notification. Memory The 831C sends an alert notification when the primary memory storage (free space) is 25%, 10%, and 0%. Primary memory storage can be HTML alert notification emails send with the event sound recording as an attachment, unless one of the following conditions applies: • Event sound recording is disabled. • The current sound recording is still being captured when the event ends. • The event sound recording is too large to attach to the email.

Setting System Alert Notification Details 9-13 internal or USB. For information about setting the primary memory storage location, see9.5 Setting Meter Preferences. Temperature An alert notification will be sent when the internal temperature of the meter is outside of 70°C and -40°C. Power There are 4 available alert notifications: • Low external power: sent when power reaches External Shutoff Voltage + 0.6 V (manually set on “Editing Power Settings” page) • Meter is shutting down due to low external battery: sent 4 seconds prior to shut down • Power from mains (AC or solar power) is lost, and meter is running on external battery for more than 30 minutes • If power lost alert is sent, then power is restored to mains for at least 3 minutes, an alert will be sent Run State This alert replaces the SLM State alert. It sends a notification for each Run, Stop, Pause, or Reset on the meter. Certification You can send an alert notification during the meter’s startup if the calibration date is expired, or if the reminder for calibration is due. This alert occurs once every 24 hours, when enabled. LEARN MORE For more information, see 5.2.4 Calibration Certification Tab. Clear Queue The 831C often queues alert notifications to send at a later time if the network connection is lost, etc. If you don’t want these older notifications to send, click the Clear Queue button to delete them.

Setting Up Cloud Storage for Data Files 9-14 FIGURE 9-9 Alert Notification Email Example Spam and Duplicate Alerts To protect recipients from receiving duplicate alert notifications for the same trigger when the state of the meter fluctuates around that trigger, the 831C has a hysteresis, or threshold, for multiple notifications that concern these specific alert details: • Memory: If a notification is sent, free memory space can raise up to 5% of the trigger level before another alert can be sent. • Temperature: If a notification is sent, the temperature can rise above the trigger (-40°C) or fall below the trigger (70°C) multiple times until the temperature rises/falls at least 5°C. If the same conditions are met again, after that, another alert notification is sent. • Low external power: After an alert is sent, the voltage can rise up to 0.5 V before another alert can be sent if the conditions are met. 9.12 Setting Up Cloud Storage for Data Files When a measurement data file is automatically or manually saved, you can save it on the meter, to a USB drive, or upload directly to a remote storage service such as Dropbox1 or an SFTP account. You can also 1. Dropbox is a registered trademark of Dropbox, Inc. in the US and other countries.

Utilizing the Logic In, Logic Out Feature 9-15 receive an alert notification via email or text when a file is saved to Cloud storage. On the meter, cloud storage is managed on the System Properties  Cloud Storage tab. However, the initial cloud storage setup must be completed by using the Setup Manager in G4 as shown section A.3 in the G4 LD Utility Manual. 9.13 Utilizing the Logic In, Logic Out Feature The 831C can receive input from an external device which can initiate a variety of actions. Logic In TAKE NOTE The CBL170 I/O Interface Cable can be used to make an electrical connection to external devices. For pinout information, see “I/O Connector Pinouts” on page A-4. The Logic Input line receives a signal from an external device, which is usually connected using the included CBL170 I/O Interface cable. The device connected through the Logic Input can initiate one of the following actions by an external trigger: Run/Stop Event A measurement run or stop can be initiated when the Time History (831C-ELA) option is installed and enabled on your meter. Marker With the Time History (831C-LOG) option installed and enabled for that measurement, Marker #1 will be initiated for the Recording Time indicated in the Setup, even if there is no sound recording. If sound recording is enabled for Marker #1, a sound recording also occurs at this time. Logic Out The Logic Out line transmits a signal to an external device, defining one of these states: Run State When the Logic Out is set to Run State, then the output will be driven high when the 831C is running and will be driven low when it is stopped. Event First, install and enable the Time History option (831C-ELA) on your meter. When Logic Out is set to Event, the output is activated with an event trigger.

Setting Reference Spectra 9-16 LEARN MORE To learn more about defining event triggers, see 17.1 Setting Up the Event History Measurement. Marker First, install and enable the Time History option (831C-ELA) on your meter. When a marker is initiated, the output is activated for the Recording Time as indicated in the setup. 9.13.1 Choosing Heater Options If a heater is detected as part of a preamp, select your preference for the heater Control: • Enabled: The heater automatically turns on or off according to the humidity and ambient temperature as shown in Figure 9-10. We recommend using this setting. FIGURE 9-10 Recommended Heater Settings • Timer: Turns the heater on and off automatically according to the Start Time (24-hr time) and End Time (24-hr time) you set here. • Off: The heater remains off. 9.14 Setting Reference Spectra When you view the normalize octave band data, you have the option to choose a negative or positive A or C weighting, or you can define up to 4 unique reference spectra. You can view these references in the Live view (see 4.1.4 About the Normalized Octave Band Page (Live Page 4)), the Overall view (see 4.2.5 About the Normalized Octave Band Page (Overall Page 5)), and in the Overall OBA page. See 4.2.4 About the Octave Band Analyzer Page (Overall Page 4). Heater Control 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% -10 0 1 2 3 4 5 6 60 Te m p e r a t u r e ( C ) H u m i d i t y High Low Off

Generating an App Password 9-17 FIGURE 9-11 Set Reference Spectra 9.15 Generating an App Password Once you set up the App Password, you will not need to log in each time you want to connect to your mail account. An app password is a 16- digit pass code that gives a non-Google app or device permission to access your Google account. Before you begin: • Set up 2-Step Verification on your account. Step 1 Log in to your Google account. You can also access your Google Account by logging in to your Gmail account. Step 2 On the top navigation panel, choose Security. Step 3 On the “Signing in to Google” panel, choose App Passwords. If you don’t see this option: • 2-Step Verification is not set up on your account • 2-Step Verification is set up for security keys only • Your account receives verification through work, school, or another organization and can’t use this feature • You’ve turned on Advanced Protection for your account Use any of the navigation buttons to highlight a band. Press 5 enter to bring up the keyboard to define that octave. This drop-down takes you to all four 1/1 Octave and four 1/3 Octave band options, where you can indicate the frequency for each selection. Selecting Name allows you to rename any of the user- defined reference spectrum. There are 12 octaves that can be defined for 1/1 Octave, and 36 for 1/3 Octave. As you navigate through the list, the screen scrolls down.

Generating an App Password 9-18 Step 4 At the bottom, choose Select app and choose the app you’re using. Step 5 Choose Select device, choose Other and give your device a name. Step 6 Choose Generate. Step 7 Enter the app Password on the System Properties  Email tab. The password is the 16-character code in the yellow bar on your device. TAKE NOTE Most of the time you’ll only enter the app password once per app or device, so you don’t need to memorize it. Step 8 If desired, select Generate a Test Email.