© National Instruments Corporation
5-1
AT-MIO-16D User Manual
Chapter 5
Calibration Procedures
This chapter discusses the calibration procedures for the AT-MIO-16D analog input and analog
output circuitry.
The AT-MIO-16D is calibrated at the factory before shipment. To maintain the 12-bit accuracy
of the AT-MIO-16D analog input and analog output circuitry, recalibration at six-month
intervals is recommended.
Factory calibration is performed with the AT-MIO-16D in its default factory configuration:
•
DIFF analog input mode
•
-10 to +10 V analog input range (bipolar)
•
-10 to +10 V analog output range (bipolar with internal reference selected)
Recalibration of your AT-MIO-16D board is recommended any time you change your board
configuration.
Calibration Equipment Requirements
For best measurement results, the AT-MIO-16D analog input circuitry needs to be calibrated so
that its measurement accuracy is within
±
0.012% of its input range (
±
1
/
2
LSB). According to
standard practice, the equipment used to calibrate the AT-MIO-16D should be 10 times as
accurate, that is, have
±
0.001% rated accuracy. Practically speaking, calibration equipment with
four times the accuracy of the item under calibration is generally considered acceptable. Four
times the accuracy of the AT-MIO-16D is 0.003%. To calibrate the AT-MIO-16D board you
need the following equipment.
For analog input calibration, a precision variable DC voltage source (usually a calibrator):
Accuracy:
±
0.001% standard
±
0.003% sufficient
Range:
greater than
±
10 V
Resolution:
100
µ
V in
±
10 V range (5
1
/
2
digits)
For analog output calibration, a voltmeter:
Accuracy:
±
0.001% standard
±
0.003% sufficient
Range:
greater than
±
10 V
Resolution:
100
µ
V in
±
10 V range (5
1
/
2
digits)
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