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National Instruments Corporation
19
NI 5122/5124 Calibration Procedure
8.
Call
niScope_FetchMeasurement
(niScope Fetch
Measurement VI) with the following parameters:
•
channelList
:
"0"
•
timeout
:
1.0
•
scalarMeasFunction
:
NISCOPE_VAL_VOLTAGE_AVERAGE
9.
Output the negative voltage listed in Table 6 (NI 5122) or Table 7
(NI 5124) with the calibrator.
10. Wait 750 ms for the output of the calibrator to settle.
11. Call
niScope_FetchMeasurement
(niScope Fetch
Measurement VI) with the following parameters:
•
channelList
:
"0"
•
timeout
:
1.0
•
scalarMeasFunction
:
NISCOPE_VAL_VOLTAGE_AVERAGE
12. Compute the error in the vertical gain as a percentage of input using
the formula:
error = (((
a
–
b
) / (
c
–
d
)) – 1) * 100
where
a
is the measured positive voltage,
b
is the measured negative
voltage,
c
is the applied positive voltage, and
d
is the applied negative
voltage.
Compare the resulting percent error to the Calibration Test Limits or
the Published Specifications listed in Table 6 (NI 5122) or Table 7
(NI 5124). If the result is within the selected test limit, the device has
passed this portion of the verification.
Table 6.
NI 5122 Vertical Gain Stimuli, Calibration Test Limits,
and Published Specifications
Range
(V)
Positive
Input (V)
Negative
Input (V)
Calibration
Test Limits
Published
Specifications
0.2
0.09
–0.09
±0.37%
±0.65%
0.4
0.18
–0.18
±0.37%
±0.65%
1
0.45
–0.45
±0.37%
±0.65%
2
0.9
–0.9
±0.37%
±0.65%
4
1.8
–1.8
±0.37%
±0.65%
10
4.5
–4.5
±0.37%
±0.65%
20
9
–9
±0.37%
±0.65%