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Copyright 2000 National Instruments Corp. All rights reserved.
July 2000
CALIBRATION PROCEDURE
SCXI -1104
Introduction
This document contains information and step-by-step instructions for
verifying and calibrating the National Instruments SCXI-1104 signal
conditioning module.
What Is Calibration?
Calibration is a procedure of reading offset and gain errors from a device
and updating special analog calibration circuitry that corrects these errors.
National Instruments calibrates every SCXI-1104 module at the factory.
During the factory calibration process, the calibration constants are stored
in the non-volatile memory of the device. These values are loaded from
memory and used as needed by the device.
Why Should You Calibrate?
Offset and gain errors drift with time and temperature, which could
invalidate the factory-set calibration of a device. Calibration restores the
device to its specified accuracy.
How Often Should You Calibrate?
The measurement accuracy requirements of your application
determine how often you should calibrate your SCXI-1104 module.
National Instruments recommends you perform a complete calibration
at least once every year. You can shorten this interval to six months or
90 days, based on the demands of your application.
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