NI 5421/5441 Calibration Procedure
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©
National
Instruments
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21
•
value
: The
wfmHandle
from step 13 of the
Verifying the Main Analog Path Gain
section (negative full-scale handle)
9.
Call
niFgen_InitiateGeneration
(niFgen Initiate Generation VI) to initiate the
waveform generation using the following parameter:
•
vi
: The session handle returned from
niFgen_init
10. Measure the negative DC voltage from the NI 5421/5441. This value is the
Measured
Negative Full-Scale Value
.
11. Call
niFgen_AbortGeneration
(niFgen Abort Generation VI) to abort the waveform
generation using the following parameter:
•
vi
: The session handle returned from
niFgen_init
12. Average the
Measured Positive Full-Scale Value
and
Measured Negative Full-Scale Value
to calculate the
Offset
.
13. Verify that the
Offset
is less than or equal to the
Offset Limit
listed in Table 6 for the current
iteration.
14. Subtract the
Offset
and the
Ideal Full-Scale Value
from the
Measured Full-Scale Value
to
get the
Error Full-Scale Value
for both the positive and negative settings, respectively.
15. If any of the errors are greater than the calibration limits listed in Table 6, perform an
external adjustment.
16. Call
niFgen_close
(niFgen Close VI) to close the instrument driver session, to destroy
the instrument driver session and all of its properties, and to release any memory resources
that NI-FGEN uses. Use the following parameter:
•
vi
: The session handle returned from
niFgen_init
Verifying the AC Voltage Amplitude Absolute Accuracy
This test verifies the AC voltage amplitude absolute accuracy of the NI 5421/5441 using a
DMM. Complete the following steps to verify the AC accuracy of the NI 5421/5441.
1.
Connect the NI 5421/5441 CH 0 front panel connector to the DMM. Connect the positive
terminal to the center pin of the NI 5421/5441 SMB connector, and connect the negative
terminal to the shield.
2.
Call
niFgen_init
(niFgen Initialize VI) using the following parameters:
•
resourceName
: The name of the device that you want to verify. You can find this
name under Devices and Interfaces in MAX.
•
IDQuery
:
VI_TRUE
•
resetDevice
:
VI_TRUE
•
vi
: A pointer to a ViSession. The variable passed by reference through this parameter
receives the value that identifies the session created by this function. This value acts
as the session handle and is passed as the first parameter to all subsequent NI-FGEN
functions.
