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Each calibration is normally done at 10% less than the maximum and 10% more than the
minimum within a given voltage range defined by the mode, channel, and gain. However,
if an application is known to use only portion of a particular range, it is possible to obtain
improved accuracy by using calibration points that are 10% less than the expected maxi-
mum and 10% greater than the expected minimum.
3.4.2.4 Factory Calibration
Because of the large number of possible calibrations, the factory performs only a rudimen-
tary calibration on the A/D Converter Card. The factory performs a single-ended calibra-
tion on each of the eight channels with a gain of 1 (0–20 V range). The remaining single-
ended calibration constants for the other seven gains are approximated and are filled in
based on the initial calibration. The milli-amp and differential portions of the table are
filled in using typical expected values. All read routines will work properly with these fac-
tory-initialized calibration constants, but only the single-ended mode should be expected
to return accurate results over a range of 0–20 V until you recalibrate the A/D Converter
Card for your use.
Sample programs are provided to illustrate how to read and calibrate the various A/D
inputs.
Mode
Single-Ended, one channel
Single-Ended, all channels
4–20 mA Current
Differential
Read
AIN_RDSE_CH.C
—
AIN_RDMA_CH.C
AIN_RDDIFF_CH.C
Calibrate
AIN_CALSE_CH.C
AIN_CALSE_ALL.C
AIN_CALMA_CH.C
AIN_CALDIFF_CH.C
These sample programs are found in the in the SAMPLES\RABBITNET\RN1200 directory.
See Section 3.5.2, “Sample Programs,” for more information on these sample programs
and how to use them.
User ’s Manual
61
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