NI 5421/5441 Calibration Procedure
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National
Instruments
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19
Compare this error to the calibration limits listed in Table 5.
15. Call
niFgen_AbortGeneration
(niFgen Abort Generation VI) to abort the waveform
generation using the following parameter:
•
vi
: The session handle returned from
niFgen_init
16. If any of the errors are greater than the calibration limits, perform an external adjustment.
Verifying the Direct Analog Path Gain
Complete the following steps to verify the NI 5421/5441 direct analog path gain.
Note
The offset is not adjustable for the direct analog path.
1.
Call
niFgen_SetAttributeViReal64
to set the offset (NI-FGEN Offset property)
using the following parameters:
•
vi
: The session handle returned from
niFgen_init
•
channelName
:
"0"
•
attributeID
:
NIFGEN_ATTR_ARB_OFFSET
•
value
:
0
2.
Call
niFgen_SetAttributeViInt32
to set the analog path (NI-FGEN Analog Path
property) using the following parameters:
•
vi
: The session handle returned from
niFgen_init
•
channelName
:
"0"
•
attributeID
:
NIFGEN_ATTR_ANALOG_PATH
•
value
:
NIFGEN_VAL_DIRECT_ANALOG_PATH
Repeat steps 3 through 12 for each of the seven iterations listed in Table 6, changing the
Gain
value for each iteration.
Table 6.
Values for Verifying the Gain of the Direct Analog Path
Iteration
Gain
Ideal
Positive
Full-Scale
(Volts)
Ideal
Negative
Full-Scale
(Volts)
Offset
Limit
(Volts)
As-Found
Limits
(Volts)
As-Left
Limits
(Volts)
1
1.000000
1.000000
-1.000000
±0.025000
±0.004000
±0.001600
2
0.950000
0.950000
-0.950000
±0.025000
±0.003800
±0.001520
3
0.900000
0.900000
- 0.900000
±0.025000
±0.003600
±0.001440
4
0.850000
0.850000
-0.850000
±0.025000
±0.003400
±0.001360
5
0.800000
0.800000
- 0.800000
±0.025000
±0.003200
±0.001280
