National Instruments SC Express PXIe-4330, Calibration Procedure

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PXIe-4330/4331 Calibration Procedure | © National Instruments | 17
Shunt Calibration Resistance Accuracy Verification
This section provides instructions for verifying the PXIe-4330/4331 shunt resistance accuracy.
Table 10 shows all settings for the PXIe-4330/4331. Throughout the shunt resistance accuracy
verification, use Table 27 to determine if the module is operating within its specified range. If
the module is not operating within the specified values, refer to the
Worldwide Support and
Services section for assistance in returning the terminal block to NI.
Complete the following steps to test the accuracy of the module shunt resistances.
1.
Configure the switch modules to connect to the channel you want to verify. Refer to table 6
for the specific switch column and row configuration. The connection paths are shown in
Figure 15 in
Appendix A: Connection Path Details .
2. Create the DAQmx task.
3. Create and configure an AI Bridge (V/V) channel.
4. Enable shunt calibration for the channel. Configure the properties for the acquisition as
described in Table 9.
5. Set the shunt calibration resistance for the channel using the Shunt Cal A Resistor Value
property with one of the following values: 33,333
Ω , 50,000 Ω , or 100,000 Ω .
6. Commit the task to enable the specified shunt resistor.
7. Take a reading of the shunt calibration resistance from the DMM using the 4-wire
measurement configuration and record the result.
8. Compare the result from step 7 to the Upper Limit and Lower Limit values in Table 27 for
the applicable resistance value. If the result is between these values, the module passes the
test.
9. Repeat steps 5 through 8 for each shunt calibration resistance you want to verify.
10. Clear the task.
11. Repeat steps 1 through 10 for each channel you want to verify.
12. Disconnect the DMM from the module.
Table 6. Shunt Resistance Accuracy Verification
Channel S witch 1
0
r3->c8,r2->c9,r2->c14,r3->c15
1
r3->c8,r2->c9,r2->c19,r3->c20
2
r3->c8,r2->c9,r2->c24,r3->c25
3
r3->c8,r2->c9,r2->c29,r3->c30
4
r3->c8,r2->c9,r2->c34,r3->c35
5
r3->c8,r2->c9,r2->c39,r3->c40
6
r3->c8,r2->c9,r2->c44,r3->c45
7
r3->c8,r2->c9,r2->c49,r3->c50