int rn_anaInCalib(int channel, int opmode,
int gaincode, int value1, float volts1,
int value2, float volts2, rn_AinData *adata);
Calibrates the response of an analog input channel as a linear function using the two conversion points
provided. Four values are calculated, and the results are sent later to the analog input device using the
function anaInWrCalib() .
Each channel will have the following information:
a linear constant or gain,
a voltage offset.
NOTE: Typical calibration constants are loaded at the factory. This function should be used when
you need more precise calibration or recalibration, or the calibration constants were corrupted in
the device.
PARAMETERS
channel is the channel number (0 to3).
Channel
0
1
2
3
Single-Ended
AIN00
AIN01
AIN02
Differential
AIN03
opmode is not used. Set to 0.
gaincode is the gain code. Use 0 for the Digital I/O Card.
value1 is the first raw data value read from the A/D converter channel.
volts1 is the voltage corresponding to the first input value (0 to +10 V, 0 to +1 V, or ± 250 mV).
value2 is the second raw data value read from the A/D converter channel .
volts2 is the voltage corresponding to the second input value (0 to +10 V, 0 to +1 V, or ± 250 mV).
rn_AinData *adata is a structure pointer to where the calibration constants, gain, and offset
values are to be written after being calculated.
RETURN VALUE
0, if successful.
-1 if not able to make calibration constants.
SEE ALSO
rn_anaInWrCalib
User ’s Manual
41
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