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CALIBRATION PROCEDURE

SCXI -1125

Introduction

This document contains information and step-by-step instructions for
verifying and calibrating the National Instruments SCXI-1125 signal
conditioning module.
What Is Calibration?
Calibration is a procedure of reading offset and gain errors from a device
andupdating special analog calibration circuitry that corrects these errors.
National Instruments calibrates every SCXI-1125 module at the factory.
Duringth efact ory calibration process, the calibration constants are stored
in the non-volatile memory of the device. These values are loaded from
memory and usedas needed by the device.
Why Should You Calibrate?
Offsetand gain errors drift with time and temperature changes, which could
invalidatethe factory-set calibration of a device and increase measurement
uncertainty. Calibration restores the device to its specified accuracy.
How Often Should YouCalibrate?
The measurement accuracy requirements of your application
determine how often you should calibrate your SCXI-1125 module.
National Instruments recommends you perform a complete calibration
at leastonce every year. You can shorten this interval to six months or
90 days, based on the demands of your application.
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