© National Instruments Corporation 59 NI PXI-5422 Calibration Procedure
27. Call niFgen_ReadCalADC (niFgen Read CAL ADC VI) to measure
the analog output voltage with the onboard calibration ADC using the
following parameters:
•vi: The session handle returned from niFgen_InitExtCal
•numberOfReadsToAverage: 3
•returnCalibratedValue: VI_FALSE
•calADCValue: A ViReal64 variable. The variable passed by
reference through this parameter receives the voltage measured
by the onboard calibration ADC. This value is cal ADC
measurement 1, which is used in step 32.
28. Call niFgen_SetAttributeViBoolean to enable the analog output
(niFgen property node: Basic Operation»Output Enabled) using
the following parameters:
•vi: The session handle returned from niFgen_InitExtCal
•channelName: "0"
•attributeID: NIFGEN_ATTR_OUTPUT_ENABLED
•value: VI_TRUE
29. Call niFgen_Commit (niFgen Commit VI) to commit the attribute
values to the device using the following parameter:
•vi: The session handle returned from niFgen_InitExtCal
30. Wait 500 ms for the output to settle.
31. Use the DMM to measure the NI PXI-5422 voltage output directly into
the DMM (into a high-impedance load). This measurement be
external measurement 1, which is used in step 32.
32. Call niFgen_CalAdjustCalADC (niFgen Cal Adjust Cal ADC VI)
using the following parameters:
•vi: The session handle returned from niFgen_InitExtCal
•voltagesMeasuredExternally: An array containing two
elements—the two voltages (external measurement 0,
external measurement 1) that you measured with the
DMM in order
•voltagesMeasuredWithCalADC: An array containing two
elements—the two voltages (cal ADC measurement 0,
cal ADC measurement 1) that you measured with the onboard
calibration ADC in the order that you measured them