UNI-T UT205A Operating Manual

3 4 5 6 9 10 11 14 17 17 19 20 21 23 25 27 Title Page Overview Unpacking Inspection Safety Information Rules For Safe Operation International Electrical Symbols The Meter Structure Functional Buttons Display Symbols Measurement Operation A. AC Current Measurement B. DC Voltage Measurement C. AC Voltage Measurement D. Measuring Resistance E. Testing for Diodes and Continuity F. Frequency and Duty Cycle (%) Measurement (Duty Cycle: UT205A only) G. Temperature Measurement (Model UT206A only) Model UT205A/206A: OPERATING MANUAL 1

The Use of Relative Value Mode(Model UT206A only) The SELECT Button Turning on the Display Backlight Sleep Mode General Specifications Accuracy Specifications A. AC Current B. DC Voltage C. AC Voltage D. Resistance E. Diode and Continuity Test F. Frequency G. Duty Cycle (Model UT205A only) H. Temperature (Model UT206A only) Maintenance A. General Service B. Replacing the Battery Model UT205A/206A: OPERATING MANUAL 2

relevant information carefully and observe all the Warnings and Notes strictly. Warning To avoid electric shock or personal injury, read the “Safety Information” and “Rules for Safety Operation” carefully before using the Meter. The Model UT205A and UT206A (hereafter referred to as “the Meter”) are a low consumption AC clamp meter with stabilize functions, safety operations, and reliable performance. In addition to the AC current feature, it can also measure AC/DC voltages, resistance, diode, continuity, frequency and temperature. Except where noted, the descriptions and instructions in this Operating Manual apply to both the Model UT205A/UT206A. Model UT205A/206A: OPERATING MANUAL 3

to see any missing or damaged part: Item Description Qty 1 2 3 4 5 In the event you find any missing or damage, please contact your dealer immediately. Operating Manual Test Lead Model UT206A: Point Contact Temperature Probe 9V Battery (NEDA 1604, 6F22 or 0006P) (installed inside the Meter) Vinyl Bag 1 piece 1 pair 1 piece 1 piece 1 piece Model UT205A/206A: OPERATING MANUAL 4

category (CAT. II 600V / CAT III 300V) and double insulation. CAT II: Local level, appliance, PORTABLE EQUIPMENT etc., with smaller transient voltage overvoltages than CAT. III CAT. III: Distribution level, fixed installation, with smaller transient overvoltages than CAT. IV. Under the influence of Radiated, Radio-Frequency Electromagnetic Field phenomenon, the captioned model may malfunction and can self-recover after the test. Use the Meter only as specified in this operating manual, otherwise the protection provided by the Meter may be impaired. In this manual, a Warning identifies conditions and actions that pose hazards to the user, or may damage the Meter or the equipment under test. A Note identifies the information that user should pay attention on. International electrical symbols used on the Meter and in this Operating Manual are explained on page 9. Model UT205A/206A: OPERATING MANUAL 5

To avoid possible electric shock or personal injury, and to avoid possible damage to the Meter or to the equipment under test, adhere to the following rules: Check for the lever is in good condition when measuring AC current. Must center the wire (conductor) within the transformer jaw. Before using the Meter inspect the case. Do not use the Meter if it is damaged or the case (or part of the case) is removed. Look for cracks or missing plastic. Pay attention to the insulation around the connectors. Inspect the test leads for damaged insulation or exposed metal. Check the test leads for continuity. Replace damaged test leads with identical model number or electrical specifications before using the Meter. Do not apply more than the rated voltage, as marked on the Meter, between the terminals or between any terminal and grounding. The rotary switch should be placed in the right position and no any changeover of range shall be made during measurement is conducted to prevent damage of the Meter. When the Meter working at an effective voltage over 60V in DC or 42V rms in AC, special care should be taken for there is danger of electric shock. Warning Model UT205A/206A: OPERATING MANUAL 6

When using the test leads, keep your fingers behind the finger guards. Disconnect circuit power and discharge all high-voltage capacitors before testing To avoid harms to you or damages to the Meter from electric shock, please do not attempt to apply higher than 600V between the terminals and grounding. Replace the battery as soon as the battery indicator appears. With a low battery, the Meter might produce false readings that can lead to electric shock and personal injury. When servicing the Meter, use only the same model number or identical electrical specifications replacement parts. The internal circuit of the Meter shall not be altered at will to avoid damage of the Meter and any accident. Soft cloth and mild detergent should be used to clean the surface of the Meter when servicing. No abrasive and solvent should be used to prevent the surface of the Meter from corrosion, damage and accident. Turn the Meter off when it is not in use and take out the battery when not using for a long time. Constantly check the battery as it may leak when it has been using for some time, replace the battery as soon as leaking appears. A leaking battery will damage the Meter. Model UT205A/206A: OPERATING MANUAL 7

explosive, inflammable and strong magnetic field. The performance of the Meter may deteriorate after dampened Model UT205A/206A: OPERATING MANUAL 8

AC (Alternating Current) DC (Direct Current) AC or DC Grounding Double Insulated Fuse Deficiency of Built-In Battery Continuity Test Diode Conforms to Standards of European Union Warning. Refer to the Operating Manual High Voltage Terminal Model UT205A/206A: OPERATING MANUAL 9

(figure 1) 1. 2. 3. 4. 5. 6. Transformer Jaws designed to pick up the AC current flowing through the conductor. Rotary Switch. LCD Display. Function Buttons Input Terminals Trigger. Press the lever to open the transformer jaws. When the pressure on the lever is released, the jaws will close. 1 2 3 4 5 6 Model UT205A/206A: OPERATING MANUAL 10

Functional Buttons Operation Performed Button Turn the display backlight on and off. In order to avoid the hazard arising from mistaken readings in insufficient light or poor vision, please use Display Backlight function. Hz% (UT205A only) 1. At ACV or DCV range Press the button to step through ACV or DCV, frequency and duty cycle measurement. The Meters enters the manual ranging measurement mode after pressing the button at the ACV or DCV measurement range. Turn the rotary switch or switch off the Meter to return to auto ranging measurement mode. Model UT205A/206A: OPERATING MANUAL 11

-4V range after returning from the Hz% cycle measurement mode. 2. At Hz range Press the button to step through frequency and duty cycle measurement mode. REL (UT206A only) Press REL to enter and exit the REL mode in any measuring mode except in frequency and duty cycle, the Meter beeps. UT206A: Switches between AC voltage and DC Voltage measurement, and continuity and diode measurement; the Meter beeps. UT205A: Switches between continuity and diode measurement; the Meter beeps. SELECT Hz% (UT205A only) Model UT205A/206A: OPERATING MANUAL 12

mode, the Meter beeps. When it is under sleep mode, press to activate the Meter at the effective measurement range, e.g. continuity buzzer. Auto power off feature will be disabled until switch off and turn on the Meter again. SELECT Model UT205A/206A: OPERATING MANUAL 13

Indicator for AC Voltage. The battery is low. Warning: To avoid false readings, which could lead to possible electric shock or personal injury, replace the battery as soon as the battery indicator appears. Percent: Used for duty cycle measurements. A Indicator for AC current Hertz. The unit of frequency. Kilohertz. 1x 103 or 1000 hertz. Megahertz. 1x106 or 1,000,000 hertz. Hz, kHz, MHz Ohm. The unit of resistance. kilohm. 1 x 103 or 1000 ohms. Megaohm. 1x106 or 1,000,000 ohms. , k , M 6 7 Model UT205A/206A: OPERATING MANUAL 15

Test of diode Centigrade. The unit of temperature. The relative value mode is on to display the stored value minus the present Volts. The unit of voltage. Millivolt. 1 x 10-3 or 0.001 volts. Model UT205A/206A: OPERATING MANUAL 16 oC

Warning The measurement value obtained is wrong if testing two or more current conductors at the same time. Make sure the Sleep Mode is not on if you found there is no display on the LCD after turning on the Meter. Make sure the Low Battery Display is not on; otherwise false readings may be provided. Pay extra attention to the symbol which is located besides the input terminals of the Meter before carrying out measeurement. Make sure you are in the proper measurement range before carrying out measurement. Model UT205A/206A: OPERATING MANUAL 17

2. Check the lever is in good condition. 3. Press the lever to open the transformer jaws. 4. Center the conductor within the transformer jaw. The measured value shows on the display, it is a effective value of sine wave (mean value response). Note When current measurement has been completed, disconnect the connection between the conductor under test and the jaw, and remove the conductor away from the transformer jaw of the Meter. To measure current, do the following: Model UT205A/206A: OPERATING MANUAL 18

(figure 4) Warning To avoid harms to you or damages to the Meter from electric shock, please do not attempt to measure voltages higher than 600V although readings may be obtained. To measure DC voltage, connect the Meter as follows: 1. Insert the red test lead into the V terminal and the black test lead into the COM terminal. 2. Set the rotary switch to DC voltage measurement mode. Red Black 3. Connect the test leads across with the object being measured. The measured value shows on the display. Model UT205A/206A: OPERATING MANUAL 19

. This loading effect can cause measurement errors in high impedance circuits. If the circuit impedance is less than or equal to 10k , the error is negligible (0.1% or less). When DC voltage measurement has been completed, disconnect the connection between the testing leads and the circuit under test, and remove the testing leads away from the input terminals of the Meter. Note AC Voltage measurement is an auto ranging measurement mode. Follow the same procedure as the DC Voltage Measurement mode. When you using UT206A to carry out the measurement, use SELECT button to switch between ACV and DCV. Note: C. AC Voltage Measurement (See figure 4) Model UT205A/206A: OPERATING MANUAL 20

Warning To avoid damages to the Meter or to the devices under test, disconnect circuit power and discharge all the high-voltage capacitors before measuring resistance. To measure resistance, connect the Meter as follows: 1. Insert the red test lead into the terminal and the black test lead into the COM terminal. 2. Set the rotary switch to . 3. Connect the test leads across with the object being measured. The measured value shows on the display. Note The test leads can add 0.1 to 0.3 of error to resistance measurement. Red Black (figure 5) Model UT205A/206A: OPERATING MANUAL 21

400.0 , short-circuit the input terminals beforehand, using the relative measurement function button REL to automatically subtract the value measured when the testing leads are short-circuited from the reading. For high-resistance measurement (>1M ), it is normal to take several seconds to obtain a stable reading. When resistance measurement has been completed, disconnect the connection between the testing leads and the circuit under test, and remove the testing leads away from the input terminals of the Meter. Model UT205A/206A: OPERATING MANUAL 22

To avoid damages to the Meter or to the devices under test, disconnect circuit power and discharge all the high-voltage capacitors before testing for continuity. Warning To test for diodes and continuity, connect the Meter as below: Red Black 1. Insert the red test lead into the terminal and the black test lead into the COM terminal. 2. For diode test a. Set the rotary switch to . b. For forward voltage drop readings on any semiconductor component, place the red test lead on the component’s anode and place the black test lead on the component’s cathode. The measured value shows on the display. Model UT205A/206A: OPERATING MANUAL 23

a. Press SELECT to switch between Diode and Continuity test. b. Connect the test lead to the two end of the circuit under test. c. The buzzer sounds if the resistance of a circuit under test is less than 100 . In a circuit, a good diode should still produce a forward voltage drop reading of 0.5V to 0.8V; however, the reverse-voltage drop reading can vary depending on the resistance of other pathways between the probe tips. Connect the test leads to the proper terminals as said above to avoid error display. The LCD will display OL indicating diode being tested is open or polarity is reversed. The unit of diode is Volt (V), displaying the forward voltage drop readings. When diode and continuity testing has been completed, disconnect the connection between the testing leads and the circuit under test, and remove the testing leads away from the input terminals of the Meter. Note Model UT205A/206A: OPERATING MANUAL 24

UT205A has both frequency and duty cycle measurement feature UT206A has only frequency measurement feature 1. UT205A a. Insert the red test lead into the Hz% terminal a the black test lead into the COM terminal. b. Set the rotary switch to Hz; press Hz% button to switch between Hz and Duty cycle measurement mode. c. Or set the rotary to ACV or DCV range, then To measure frequency and duty cycle, connect the Meter as follows: press Hz% button to switch between ACV or DCV, Hz and Duty cycle measurement mode. But the accuracy will have a little difference based on the input frequency and wave. Red Black Hz% Model UT205A/206A: OPERATING MANUAL 25

The measured frequency value or duty cycle value shows on the display. a. Insert the red test lead into the Hz terminal and the black test lead into the COM terminal. b. Set the rotary switch to Hz. c. Connect the test leads across with the object being measured. 2. UT206A When frequency and duty cycle measurement has been completed, disconnect the connection between the testing leads and the circuit under test, and remove the testing leads away from the input terminals of the Meter. The measured frequency value shows on the display. Note Model UT205A/206A: OPERATING MANUAL 26

1. Insert the red temperature probe into the oC terminal and the black temperature probe into the COM terminal. 2. Set the rotary switch to oC. 3. Place the temperature probe to the object being measured. The measured value shows on the display. (figure 8) To measure temperature, connect the Meter as follows: When there is no temperature probe inserted into the terminals, the LCD displays OL. The included point contact temperature probe can only Note be used up to 250 oC. For any measurement higher than that, it is necessary to use another type of temperature probe. When temperature measurement has been completed, disconnect the connection between the testing leads and the circuit under test, and remove the testing leads away from the input terminals of the Meter. Model UT205A/206A: OPERATING MANUAL 27

To avoid possibility of electric shock, do not use Hold mode to determine if circuits are without power. The Hold mode will not capture unstable or noisy readings. Warning The Hold mode is applicable to all measurement functions. Press HOLD to enter Hold mode; the Meter beeps. Press HOLD again or turn the rotary switch to exit Hold mode; the Meter beeps. In Hold mode, is displayed. Model UT205A/206A: OPERATING MANUAL 28

cycle. It subtracts a stored value from the present measurement value and displays the result. For instance, if the stored value is 20.0V and the present measurement value is 22.0V, the reading would be 2.0V. If a new measurement value is equal to the stored value then display 0.0V. To enter or exit REL mode: Use rotary switch to select the measurement function before selecting REL . If measurement function changes manually after REL is selected, the Meter exits the REL mode. Press REL to enter REL mode, auto ranging turns off, and the present measurement range is locked and stored as the stored value. All the measurements done after will be automatically subtract this stored value. Press REL again to exit REL mode and return to common measurement mode. If you want to enter the auto ranging measurement mode or other ranges, please turn the rotary switch or power off the Meter and start again. The Use of Relative Value Mode (UT206A only) Model UT205A/206A: OPERATING MANUAL 29

It uses for selecting the required measurement function when there is more than one function at one position of the rotary switch. Turning on the Display Backlight In order to avoid the hazard arising from mistaken readings in insufficient light or poor vision, please use Display Backlight function. Warning Press and hold button for over 2 seconds to turn the Display Backlight on. Press button again to turn the Display Backlight off, otherwise it will stay on continuously. To preserve battery life, the Meter automatically turns off if you do not turn the rotary switch or press any button for around 15 minutes. Sleep Mode The Meter can be activated by turning the rotary switch or pressing the effective button, it will return to working mode. Model UT205A/206A: OPERATING MANUAL 30

any Terminals and Grounding: 600V rms or 600V DC. Maximum Current Measurement: 1000A. of Transformer Jaw: Maximum Jaw Size: 40mm. Maximum Display: Digital: 3999, 3 3/4 digits Overload Display: OL Range: Auto Polarity Display: Negative display: “-“ Measurement Speed: Updates 3 times/second. Temperature: Operating: 0 oC to +40 oC (32 oF to+104 oF). Storage: -10 oC to +50 oC (14 oF to +122 oF). Relative Humidity: 75% @ 0 oC to 40 oC; 70% @ -10 to 50 oC. Altitude: Operating: 2000 m. Storage: 10000 m. General Specifications Model UT205A/206A: OPERATING MANUAL 31

Battery Deficiency: Display Dimensions (HxWxL): 236mm x 97mm x 40mm Weight: Approximate 350g (battery included). Safety/Compliances: IEC61010 CAT. II 600V / CAT III 300V overvoltage and double insulation standard. Certifications: Auto power off Accuracy: (a% reading + b digits), guarantee for 1 year. Operating temperature: 23 oC 5 oC. Relative humidity: 75%. Accuracy Specifications Model UT205A/206A: OPERATING MANUAL 32

Range Resolution Accuracy Remarks 400A 1000A 0.1A 1A (1.5%+5) 800A (2%+5) Frequency response 50Hz~60Hz. Display effective value of sine wave (mean value response). >800A (3%+5) B. DC Voltage 400mV 4V 40V 400V 600V 100 V 1mV 10mV 100mV 1V (0.8%+3) (0.8%+1) (1%+3) Range 600V DC 600V AC Input impedance: around 10M . Resolution Accuracy Overload Protection Remarks Model UT205A/206A: OPERATING MANUAL 33

40V 40V 400V 600V (1.2%+2) 600V DC 600V AC Range Resolution Accuracy Overload Protection Remarks 1mV 10mV 100mV 1V (1.5%+5) Input impedance around 10M . Displays effective value of sine wave (mean value response). Frequency response: 40Hz ~ 400Hz. D. Resistance Range Resolution Accuracy Overload Protection 400 4k 0.1 1 (1%+2) 500V DC or AC (1.2%+5) Model UT205A/206A: OPERATING MANUAL 34

40k 400k 4M 40M 10 100 1k 10k 500V DC or AC (1%+2) (1.2%+2) (1.5%+2) E. Diode and Continuity Test Function Range Resolution Overload Remarks Diode Continuity 1mV 0.1 500V DC or AC Displays the nearest value of forward voltage drop Buzzer beeps when 100 Model UT205A/206A: OPERATING MANUAL 35

Range Resolution Accuracy Overload Protection Remarks 10Hz- 10MHz Min 0.001Hz (0.1%+3) 500V DC or VAC Input Voltage: 1MHz: 300mV rms a 30V rms; 1MHz: 600mV rms a 5V rms G. Duty Cycle (Model UT205A only) Range Resolution Accuracy Overload Protection 0.1%-99.9% 0.1% For reference only 500V DC or AC H. Temperature (Model UT206A only) -40 oC~0 oC 1 oC~400 oC 401 oC~1000 oC Range Resolution Accuracy Overload Protection 1 oC (4%+4) (2%+8) (3%+10) 500V DC or AC Model UT205A/206A: OPERATING MANUAL 36

instruction. Do not attempt to repair or service your Meter unless you are qualified to do so and have the relevant calibration, performance test, and service information. Warning To avoid electrical shock or damage to the Meter, do you get water inside the case. A. General Service Periodically wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. To clean the terminals with cotton bar with detergent, as dirt or moisture in the terminals can affect readings. Turn the Meter to OFF position when it is not in use. Take out the battery when it is not using for a long time. Do not use or store the Meter in a place of humidity, high temperature, explosive, inflammable and strong magnetic field. Model UT205A/206A: OPERATING MANUAL 37

Warning (figure 9) To avoid false readings, which could lead to possible electric shock or personal injury, replace the battery as soon as the battery indicator “ ” appears. Make sure the transformer jaw and the test leads are disconnected from the circuit being tested before opening the case bottom. Make sure the test leads are removed from the input terminals. Screw Model UT205A/206A: OPERATING MANUAL 38

1. Turn the rotary switch of the Meter to OFF position and remove all the connections from the terminals. 2. Remove the screw from the battery compartment, and separate the battery compartment from the case bottom. 3. Remove the battery from the battery compartment. 4. Replace the battery with a new 9V battery (NEDA1604, 6F22 or 006P) and or a 1.5V battery (AAA). 5. Rejoin the case bottom and battery compartment, and reinstall the screw. ** END ** Model UT205A/206A: OPERATING MANUAL 39

All rights reserved. Manufacturer: Uni-Trend Technology (Dongguan) Limited Dong Fang Da Dao Bei Shan Dong Fang Industrial Development District Hu Men Town, Dongguan City Guang Dong Province China Postal Code: 523 925 Headquarters: Uni-Trend Group Limited Rm901, 9/F, Nanyang Plaza 57 Hung To Road Kwun Tong Kowloon, Hong Kong Tel: (852) 2950 9168 Fax: (852) 2950 9303 Email: [email protected] http://www.uni-trend.com Model UT205A/206A: OPERATING MANUAL 40