NI 5421, Calibration Procedure

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NI 5421/5441 Calibration Procedure | © National Instruments | 53
21. Wait 500 ms for the output to settle.
22. Use the DMM to measure the NI 5421/5441 voltage output directly into the DMM into a
high-impedance load. This measurement is
external measurement 0
, which is used
in step 32.
23. Call
niFgen_WriteBinary16AnalogStaticValue
(niFgen Write Binary 16 Analog
Static Value VI) to set the main DAC value using the following parameters:
•
vi : The session handle returned from
niFgen_InitExtCal
• channelName :
"0"
• value :
10232
24. Call
niFgen_SetAttributeViBoolean
to disable the analog output (NI-FGEN
Output Enabled property) using the following parameters:
•
vi : The session handle returned from
niFgen_InitExtCal
• channelName :
"0"
• attributeID :
NIFGEN_ATTR_OUTPUT_ENABLED
• value :
VI_FALSE
25. 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
26. Wait 500 ms for the output to settle.
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 (NI-FGEN Output
Enabled property) 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 5421/5441 voltage output directly into the DMM (into a
high-impedance load). This measurement is
external measurement 1
, which is used
in step 32.