National Instruments PXI-4070 6 1/2 Digit FlexDMM Manuals

© 2003 National Instruments Corp. All rights reserved. CVI™, FlexDMM™, LabVIEW™, National Instruments™, NI™, ni.com™, and NI-DMM™ are trademarks of National Instruments Corporation. Product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your CD, or ni.com/patents. February 2003 370532A-01 NI PXI-4070 6½ Digit FlexDMM Calibration Procedure This document contains step-by-step instructions for writing an external calibration procedure for the NI PXI-4070 6½ digit FlexDMM and 1.8 MS/s isolated digitizer (NI 4070). Contents Conventions ............................................................................................ 2 Calibration Overview.............................................................................. 2 What Is Calibration? ........................................................................ 3 Why Should You Calibrate?............................................................ 3 How Often Should You Calibrate?.................................................. 3 What Calibration Options Are Available?....................................... 4 How Much Time Does Calibration Require? .................................. 4 Equipment and Other Test Requirements ............................................... 4 Required Test Equipment ................................................................ 4 Optional Test Equipment................................................................. 5 Test Conditions................................................................................ 5 Documentation................................................................................. 6 Software........................................................................................... 6 Verification Procedures........................................................................... 9 Setting Up the Test Equipment........................................................ 9 Verifying DC Voltage...................................................................... 10 Verifying AC Voltage...................................................................... 18 Verifying 4-Wire Resistance ........................................................... 26 Verifying 2-Wire Resistance ........................................................... 28 Verifying DC Current ...................................................................... 33 Verifying AC Current ...................................................................... 35 Verifying Frequency........................................................................ 36 Adjustment Procedures ........................................................................... 38 Setting Up the Test Equipment........................................................ 39 Adjusting DC Voltage and Resistance............................................. 39 Adjusting AC Voltage (AC- and DC-Coupled) Modes................... 45 ™ ni.com all-guides.c om