National Instruments SCXI-1141, Calibration Procedure

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SCXI-1141/1142/1143 Calibration Procedure 10 ni.com
Adjusting the SCXI-1141/1142/1143
This section contains three adjustment procedures: one for measuring gain
error, one for adjusting calibration gain constants, and one for adjusting
filter AC gain.
Measuring Gain Errors
Complete the following steps to measure the gain errors in the
SCXI-1141/1142/1143:
1. Read the Test Conditions section in this document.
2. Refer to Table 9 for the specifications to be tested. Table 9 shows all
acceptable settings for the module.
3. Ensure that the E Series DAQ device is connected to the
SCXI-1141/1142/1143.
4. Call
SCXI_Single_Chan_Setup
to configure the module for
single-channel measurements. Set the following parameters:
• SCXIchassisID —The value obtained from MAX
• moduleSlot —1
• moduleChan —0
• DAQdeviceNumber —The device number assigned by MAX
for the E Series DAQ device
5. Call
SCXI_Set_Gain
to configure the module to the gain value you
want to adjust. Set the following parameters:
• SCXIchassisID —The value obtained from MAX
• moduleSlot —1
• moduleChan —0
• gain —The gain value from Table 9 that you are currently testing
Table 5. Passband Test Points for the SCXI-1142
Frequency (kHz) Lower Limit (V
rms
) Upper Limit (V
rms
)
2.5 0.9596 0.9889
5.0 0.8909 0.9336
Table 6. Passband Test Point for the SCXI-1143
Frequency (kHz) Lower Limit (V
rms
) Per Limit (V
rms
)
5.0 0.9882 1.0119