©
National Instruments Corporation
27
NI 5421/5441 Calibration Procedure
3.
Call
niFgen_SetAttributeViReal64
to set the gain
(niFgen property node:
Arbitrary Waveform Output»
Arbitrary Waveform Gain
) 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 (niFgen property node:
Arbitrary
Waveform Output»Arbitrary Waveform Handle
) using
the following parameters:
•
vi
: The session handle returned from
niFgen_init
•
channelName
:
"0"
•
attributeID
:
NIFGEN_ATTR_ARB_WAVEFORM_HANDLE
•
value
: The
wfmHandle
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 out of the NI 5421/5441. This is the
Measured Positive Full-Scale Value
.
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)
Calibration
Test Limit
(Volts)
Published
Spec (Volts)
1
1.000000
1.000000
–1.000000
±0.025000
±0.001600
±0.004000
2
0.950000
0.950000
–0.950000
±0.025000
±0.001520
±0.003800
3
0.900000
0.900000
–0.900000
±0.025000
±0.001440
±0.003600
4
0.850000
0.850000
–0.850000
±0.025000
±0.001360
±0.003400
5
0.800000
0.800000
–0.800000
±0.025000
±0.001280
±0.003200
6
0.750000
0.750000
–0.750000
±0.025000
±0.001200
±0.003000
7
0.710000
0.710000
–0.710000
±0.025000
±0.001136
±0.002840
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
)
