NI 5922 Calibration Procedure
18
ni.com
6.
Wait 2,500 ms for the calibrator to settle.
7.
Call
niScope_InitiateAcquisition
(niScope Initiate
Acquisition VI) with the following parameter:
•
vi
: The instrument handle you obtained from
niScope_init
8.
Call
niScope_FetchMeasurement
(niScope Fetch
Measurement VI) with the following parameters:
•
channelList
:
"0"
•
timeout
:
1.0
•
scalarMeasFunction
:
NISCOPE_VAL_VOLTAGE_AVERAGE
9.
Generate the negative voltage listed in Table 6 with the calibrator.
10. Wait 2,500 ms for the output of the calibrator to settle.
11. Call
niScope_InitiateAcquisition
(niScope Initiate
Acquisition VI) with the following parameter:
•
vi
: The instrument handle you obtained from
niScope_init
12. Call
niScope_FetchMeasurement
(niScope Fetch
Measurement VI) with the following parameters:
•
channelList
:
"0"
•
timeout
:
1.0
•
scalarMeasFunction
:
NISCOPE_VAL_VOLTAGE_AVERAGE
13. Calculate the error in the vertical gain as a percentage of input using
the following formula:
where
a
= the measured positive voltage
b
= the measured negative voltage
c
= the applied positive voltage
d
= the applied negative voltage
Compare the resulting percent error to the
Calibration Test Limits
or
the
Published Specifications
listed in Table 6. If the result is within the
selected test limit, the device has passed this portion of the verification.
14. Repeat steps 1 through 13 for each iteration listed in Table 6, changing
the
Range
,
Positive Input
, and
Negative Input
values accordingly.
15. Move the calibrator to the digitizer input channel 1 and repeat steps 1
through 14, changing the value of the
channelList
parameter from
"0"
to
"1"
.
error
a b
–
c d
–
------------
1
–
100
×
=
