NI 5421, Calibration Procedure

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20 | ni.com | NI 5421/5441 Calibration Procedure
3. Call
niFgen_SetAttributeViReal64
to set the gain (NI-FGEN Gain property) using
the following parameters:
•
vi : The session handle returned from
niFgen_init
• channelName :
"0"
• attributeID :
NIFGEN_ATTR_ARB_GAIN
• value : The Gain value listed in Table 6 for the current iteration
4. Call
niFgen_SetAttributeViInt32
to choose the positive full-scale DC waveform
(NI-FGEN Arbitrary Waveform Handle property) using the following parameters:
•
vi : The session handle returned from
niFgen_init
• channelName :
"0"
• attributeID :
NIFGEN_ATTR_ARB_WAVEFORM_HANDLE
• value : The wfmHandle from step 10 of the Verifying the Main Analog Path Gain
section (positive full-scale handle)
5. Call
niFgen_InitiateGeneration
(niFgen Initiate Generation VI) to initiate the
waveform generation using the following parameter:
•
vi : The session handle returned from
niFgen_init
6. Measure the positive DC voltage from the NI 5421/5441. This value is the Measured
Positive Full-Scale Value .
7. Call
niFgen_AbortGeneration
(niFgen Abort Generation VI) to abort the waveform
generation using the following parameter:
•
vi : The session handle returned from
niFgen_init
8. Call
niFgen_SetAttributeViInt32
to choose the negative full-scale DC waveform
(NI-FGEN Arbitrary Waveform Handle property) using the following parameters:
•
vi : The session handle returned from
niFgen_init
• channelName :
"0"
• attributeID :
NIFGEN_ATTR_ARB_WAVEFORM_HANDLE
6 0.750000 0.750000 - 0.750000 ±0.025000 ±0.003000 ±0.001200
7 0.710000 0.710000 - 0.710000 ±0.025000 ±0.002840 ±0.001136
Note : Offset = (( Measured Positive Full-Scale Value ) + ( Measured Negative Full-Scale Value ))/2

Error Positive Full-Scale Value = ( Measured Positive Full-Scale Value ) - Offset - ( Ideal Positive
Full-Scale Value )

Error Negative Full-Scale Value = ( Measured Negative Full-Scale Value ) - Offset - ( Ideal Negative
Full-Scale Value )
Table 6. Values for Verifying the Gain of the Direct Analog Path (Continued)
Iteration Gain
Ideal
Positive
Full-Scale
(Volts)
Ideal
Negative
Full-Scale
(Volts)
Offset
Limit
(Volts)
As-Found
Limits
(Volts)
As-Left
Limits
(Volts)