NI 5421/5441 Calibration Procedure
26
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11. Call
niFgen_InitiateGeneration
(niFgen Initiate Generation VI)
to initiate the waveform generation using the following parameter:
•
vi
: The session handle returned from
niFgen_init
12. Measure the negative DC voltage out of the NI 5421/5441. This is the
Measured Negative Offset Value
.
13. Determine the error for negative offset using the following formula:
Error Negative Offset
=
(
Measured Negative Offset Value
) – (
Ideal Negative Offset Value
)
Compare this error to the
Published Spec
or the
Calibration Test Limit
.
14. Call
niFgen_AbortGeneration
(niFgen Abort Generation VI) to
abort the waveform generation using the following parameter:
•
vi
: The session handle returned from
niFgen_init
15. If any of the errors are greater than the
Calibration Test Limit
, perform
an external adjustment.
Verifying the Gain of the Direct Path
To verify the gain of the NI 5421/5441 Direct path, complete the following
steps:
Note
The offset is not adjustable for the Direct path.
1.
Call
niFgen_SetAttributeViReal64
to set the offset (niFgen
property node:
Arbitrary Waveform Output»Arbitrary
Waveform Offset
) 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 (niFgen
property node:
Output Attributes»Analog Path)
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 14 for each of the seven iterations listed in Table 6,
changing the
Gain
value for each iteration.
