2.
Initiate an external calibration session (a special type of NI-DCPower session) by calling
the niDCPower Initialize External Calibration or niDCPower_InitExtCal function.
3.
Call the self-calibration function.
Ensure the following conditions during adjustment:
•
Keep the calibration session open until you complete all adjustment procedures.
•
Complete all adjustment procedures within 15 minutes or less after initiating the external
calibration session.
•
Complete all adjustment procedures in the specified order.
•
Do not self-calibrate the device except as specified in a procedure.
Voltage and Current Output
Connecting and Configuring Equipment for Voltage Adjustment
1.
Make the necessary connections for this procedure, as shown in the following figure.
Figure 9.
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.
Adjusting Voltage Output and Measurement
Compare a set of voltages measured by an external DMM to the voltage test points requested
by the NI 4138.
Refer to the following table as you complete the following steps.
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NI PXIe-4138 Calibration Procedure
