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© 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