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CALIBRATION PROCEDURE

RM-4339

Rack-Mount Accessory Universal Bridge

This document contains the verification procedures for the National Instruments RM-4339. For 
more information about calibration solutions, visit 

ni.com/calibration

.

Contents

Software.................................................................................................................................... 1
Documentation.......................................................................................................................... 2
Test Equipment......................................................................................................................... 3

Connecting the Calibrator to the RM-4339 ...................................................................... 4

Test Conditions......................................................................................................................... 4
Initial Setup............................................................................................................................... 5
Verification............................................................................................................................... 5

SCA Shunt Calibration Resistance Accuracy Verification .............................................. 5
Offset Voltage Verification .............................................................................................. 7
Quarter-Bridge Shunt Calibration Accuracy Verification................................................ 9

Specifications............................................................................................................................ 12
World Wide Support and Services ........................................................................................... 13

Software

Calibrating the NI RM-4339 requires the installation of NI-DAQmx on the calibration system. 
Driver support for the RM-4339 was first available in NI-DAQmx 14.5. For the list of devices 
supported by a specific release, refer to the NI-DAQmx Readme, available on the 
version-specific download page or installation media.

You can download NI-DAQmx from 

ni.com/downloads

. NI-DAQmx supports numerous 

programming languages, including LabVIEW, LabWindows

/CVI

, C/C++, C#, and Visual 

Basic .NET. When you install NI-DAQmx, you only need to install support for the application 
software that you intend to use.

ni.com/manuals

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Содержание RM-4339

Страница 1: ...curacy Verification 9 Specifications 12 World Wide Support and Services 13 Software Calibrating the NI RM 4339 requires the installation of NI DAQmx on the calibration system Driver support for the RM...

Страница 2: ...dware setup NIPXIe 4339 User Manual NI PXIe 4339 specific information NI PXIe 4339 Specifications NI PXIe 4339 specifications and calibration interval NI DAQmx Readme Operating system and application...

Страница 3: ...r and can sink 15 mA on the 120 setting 8 mA on the 350 setting and 3 mA on the 1 k setting Ohm Meter NI PXI 4070 If this instrument is unavailable use a 6 digit DMM with 2 wire resistance measurement...

Страница 4: ...how to install and use the RM 4339 Test Conditions The following setup and environmental conditions are required to ensure the RM 4339 meets published specifications Keep connections to the RM 4339 a...

Страница 5: ...erification procedures assume that adequate traceable uncertainties are available for the calibration references SCA Shunt Calibration Resistance Accuracy Verification This section provides instructio...

Страница 6: ...hunt Cal c Commit the task by calling DAQmx Control Task with the following parameter Action Commit 4 Take a resistance measurement from the DMM and record the result 5 Compare the result from step 4...

Страница 7: ...n of the environment should be kept within 1 C between measurement of the offset error of the NI PXIe 4339 and the offset measurement of the RM 4339 Complete the following steps to verify the offset v...

Страница 8: ...nector on the back of the RM 4339 4 Connect an RJ50 cable to each channel with AI pin 2 and AI pin 3 connected to T pin 9 5 Acquire voltage measurements from all channels with the NI PXIe 4339 a Creat...

Страница 9: ...connect QTR pin 5 to LO and connect AI pin 2 to LO as shown in Figure 2 Figure 2 RJ50 to Calibrator Connections b QTR and AI must be connected together at the calibrator The EX lead wire and the QTR l...

Страница 10: ...erage the readings that you acquired and record the values as ResultSCD g Clear the task by calling DAQmx Clear Task 7 Acquire an AI Bridge V V measurement with shunt calibration enabled a Create a ta...

Страница 11: ...47 for 350 SCalExp 0 00248756 for 1 k For reference the calculation for the expected shunt calibration deflection is given by the following equation where Req is the equivalent parallel resistance of...

Страница 12: ...e Test limits in this document are based upon the March 2015 edition of the NI PXIe 4339 and RM 4339 User Guide and Terminal Block Specifications Refer to the most recent NI PXIe 4339 and RM 4339 User...

Страница 13: ...ivate expense and is subject to the applicable limited rights and restricted data rights as set forth in FAR 52 227 14 DFAR 252 227 7014 and DFAR 252 227 7015 World Wide Support and Services The Natio...

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