Measurement Computing Data Acquisition Systems rev.10.4 - Manual (Page 142)

daqCalSetConstants
Also See: daqCalGetConstants, daqCalSelectCalTable,
daqCalSelectInputSignal, daqCalSaveConstants
Format
daqCalSetConstants(handle, channel, gain, range, gainConstant,
offsetConstant)
Purpose
daqCalSetConstants sets the user-accessible calibration constants.
Parameter Summary
Parameter Type Description
handle DaqHandleT Handle to the device from which ADC transfer status will be
retrieved
channel DWORD Channel number for which to apply the calibration settings
gain DaqAdcGain Gain range for which to apply the calibration settings
range DaqAdcRangeT A/D input range for which to apply the calibration settings
gainConstant WORD Gain value to apply
offsetConstant SHORT Offset value to apply
Parameter Values
handle: obtained from the daqOpen function
channel: a valid channel for the device
gain: s ee ADC Gain Definition table for gain parameter definitions
range: see table below
gainConstant: valid values range from 0 to 65,535
offsetConstant: valid values range from –32,768 to 32,767
Parameter Type Definitions
range-(DaqAdcRangeT)
Definition Description
DarUni0to10V Sets acquisition range as unipolar from 0 to +10 Volt range
DarBiMinus5to5V Sets acquisition range as bipolar from -5 to +5 Volt range
DarUniPolarDE Sets acquisition range as unipolar differential
DarBiPolarDE Sets acquisition range as bipolar differential
DarUniPolarSE Sets acquisition range as unipolar single-ended
DarBiPolarSE Sets acquisition range as bipolar single-ended
Returns
DerrNoError No error
Function Usage
Selecting the Calibration Constants to Retrieve
Before calling this function, the daqOpen function should be used to open the device from which the
calibration constants will be retrieved, and the daqCalSelectCalTable functions should be used to select
the calibration table from which the calibration constants will be retrieved. The internal tables are organized
into gain and calibration entries according to the channel, gain range and A/D range capabilities of the device.
The following need to be selected for each calibration gain and offset constant entries to be retrieved:
• The channel parameter should be set to the desired channel.
• The gain parameter should be set to the desired gain setting for the selected channel.
• The range parameter should be set to the desired range for the gain and channel selection.
4.3-16 Daq API Command Reference 908494 Programmer’s Manual