Verification
The performance verification procedures assume that adequate traceable uncertainties are
available for the calibration references.You must complete all verification procedures in the
specified order.
Self-Calibrating
Complete the following steps to self-calibrate the device.
1.
Disconnect or disable all connections to the device.
2.
Ensure the device had 30 minutes to warm up with the PXI chassis fans set to HIGH.
3.
Initialize an NI-DCPower session.
4.
Call the self-calibration function.
5.
Close the NI-DCPower session.
Voltage and Current Verification
You do not need to separately verify or adjust both measurement and output. The architecture
of the NI 4138 ensures that if measurement is accurate, then output is as well, and vice versa.
Connecting and Configuring Equipment for Voltage Verification
1.
Make the necessary connections for this procedure, as shown in the following figure.
Figure 2.
Voltage Verification or Adjustment Connection Diagram
DMM
Voltage
Mode
+
–
NI-DCPower Device
Sense LO
Sense HI
HI
LO
2.
Set the niDCPower Output Function property or NIDCPOWER_OUTPUT_FUNCTION
attribute to DC Voltage for the NI 4138.
Verifying Voltage Measurement and Output
Compare a set of voltages measured by an external DMM to the voltage test points requested
by the NI 4138.
Verify ranges in the specified order.
Refer to the following table as you complete the following steps.
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NI PXIe-4138 Calibration Procedure