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SCXI-1125 Calibration Procedure 6 ni.com
13. Call
SCXI_Scale
. Set the following parameters:
• SCXIChassisID—The value assigned by MAX
• moduleSlot—1
• channel—The same channel number from step 7
• SCXIgain—The same gain value from step 9
• TBgain—1
• DAQboard—The device number for the DAQ device
• DAQChannel—0
• DAQgain—1 for 16-bit devices, –1 for 12-bit devices
• numPoints—5.000
• binArray—The array returned from the
DAQ_Op
function
The result is a set of scaled voltages that you read from the SCXI
module.
14. Average the results returned from the
SCXI_Scale
function. Compare
the averaged result to the upper and lower limits in Table 1. If the result
falls within these limits, your module has passed this portion of the
test. If it does not, your module needs to be adjusted using the steps in
the next section, Adjusting for Gain and Offset Errors.
15. Repeat steps 8 through 14 for the remaining gains.
16. Repeat steps 7 through 15 for the remaining channels.
You have now finished verifying your SCXI-1125.
Note
If all channels fall within the upper and lower limits, your device does not need to
be adjusted.
Adjusting for Gain and Offset Errors
The following two sections explain how to determine the gain and offset
errors of your SCXI-1125 and how to adjust the calibration constants to
correct for these errors.
Determining Gain and Offset Errors
Complete the following steps to determine the gain and offset errors of the
SCXI-1125:
1. Read the Test Conditions section.
2. Connect the E Series device to the SCXI-1125.
3. Call
Calibrate_E_Series
to minimize the uncertainty associated
with the E series device measurements. Set the following parameters:
• deviceNumber—The value assigned by MAX