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Refer to Table 2 for the analog signal names of the TB-4357.
Verification
Verification determines how well the module is meeting its specifications. By completing this
procedure, you can see how the module has drifted over time, which helps you determine the
appropriate calibration interval for your application. The NI PXIe-4357 has 20 independent
analog input channels. You can conduct verification on any or all of them, depending upon your
desired test coverage.
4-Wire Accuracy Verification
Complete the following steps to test the 4-wire accuracy of the module.
1.
Set the calibrator to standby mode (STBY).
2.
Make the following connections to the TB-4357 for the channel you want to verify. Refer
to Figure 2 for visual reference. Refer to the
Connecting the Calibrator to the Module
section for the pin assignments and signal names of the TB-4357.
Figure 2.
4-Wire Accuracy Verification Connections
3.
Zero the calibrator with the ohms-only zero (OHMS ZERO) operation. Refer to the
calibrator documentation for more information about zeroing the calibrator.
4.
Set the calibrator output for 4-wire compensation (COMP 4-wire).
5.
Set the calibrator resistance output to a 0
Ω
.
6.
Set the calibrator to operate mode (OPR).
7.
Create a task.
Table 2.
TB-4357 Analog Signal Names
Signal Names
Signal Descriptions
EX–
Excitation current return
EX+
Positive excitation current output
AI–
Negative analog input
AI+
Positive analog input
C
a
li
b
r
a
tor
HI
AUX HI
AUX LO
LO
TB-4
3
57
CH X
EX+
AI+
AI–
EX–
