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When calibrating the A/D converter. its output depends on the accuracy of the meter used
to measure the voltage source used in the calibration process. Therefore, use the best digital
voltmeter available that meets or exceeds the 10-bit accuracy of the A/D converter chip.
2.5.3.1 Calibration Constants
The A/D converter has four individual input channels available. To get the best results
form the A/D converter, it is necessary to calibrate each channel. The following table pro-
vides a grid for each possible set of calibration constants.
Single-Ended
Differential
Channel
AIN0
AIN1
AIN2
AIN3– AIN3+
Input
When a calibration is performed, it fills in one of the squares in the table with a set of cal-
ibration constants representing the corresponding channel. These constants are stored in
flash memory, and are thus maintained even when power is been removed from the Digital
I/O Card.
The sample programs listed in the table below are provided to illustrate how to read and
calibrate the various A/D inputs.
Mode
Read
Calibrate
Single-Ended, one channel
AIN_RDSE_CH.C
AIN_CALSE_CH.C
Differential, analog ground
AIN_RDDIFF_CH.C
AIN_CALDIFF_CH.C
These sample programs are found in the AIN subdirectory in SAMPLES\RABBITNET
RN1100\ADC . See Section 2.6.2, “Sample Programs,” for more information on these
sample programs and how to use them.
2.5.3.2 Calibration Recommendations
Calibrate each of the A/D converter inputs in the same manner as they are to be used in the
application. For example, if you will be performing floating differential measurements or
differential measurements using a common analog ground, then calibrate the A/D con-
verter in the corresponding manner.
It is not necessary to fill out the entire calibration table. Only the entries associated with
the channels that you will be using are necessary. This will simplify and speed up the cali-
bration process.
28
RabbitNet Peripheral Cards
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