AD1200 Reference
Calibration
CHAPTER 4
CALIBRATION.
Introduction.
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This chapter describes how to perform a calibration of the
AD1200 analogue circuitry. The use of the calibration software,
the position and function of the onboard trimmer pots and use of
ancillary equipment are all described. Calibration should be
performed at regular intervals, at least twice a year, and
whenever the input or output ranges are changed, to ensure that
the AD1200 remains in specification, and that your analogue
measurements are traceable back to nationally and internationally
recognised standards.
All AD1200 cards are factory calibrated with Time
Electronics calibration equipment, the voltage source is a Time
2003N D.C. Voltage Calibrator, the voltmeter is A Time
Electronics 5075 Digital Multimeter. The best on the market.
Note Allow the PC with the AD1200 card, cables, the
voltmeter and/or the voltage source to warm up and
allow the operating environment temperature to
stabilise before attempting calibration. Provided the
room temperature is stable connect the calibration
equipment together, remove the PC cover and leave the
PC and card to warm up for at least one hour. Do not
expect a successful calibration in a system just turned
on, first thing in a cold office on a winters morning.
Calibrating The Digital To Analogue Output.
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There are two analogue outputs on the AD1200 card,
DAC0 and DAC1, each must be calibrated separately.
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Chapter 4
