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National Instruments Corporation
21
NI 5450 Calibration Procedure
12. Initiate a waveform acquisition using the niScope Initiate
Acquisition VI.
13. Fetch a waveform from the digitizer and perform a voltage average
measurement using the niScope Fetch Measurement (poly) VI. Select
the Measurement Scalar DBL instance of the VI. The resulting value
is the
Measured Negative Input Voltage
14. Calculate the error in the vertical gain as a percentage of input using
the following formula:
where
a
= the
Measured Positive Input Voltage
b
= the
Measured
Negative Input Voltage
c
= the applied
Positive Input Voltage
d
= the applied
Negative Input Voltage
Compare the resulting percent error to the
Calibration Test Limits
or the
Published Specifications
listed in Table 7 (NI 5152) or Table 8
(NI 5153/5154). If the result is within the selected test limit, the device
has passed this portion of the verification.
15. Repeat steps 2 through 14 for each iteration in Table 3 (NI 5152) or
Table 4 (NI 5153/5154).
LabVIEW VI
C/C++ Function Call
Call
niScope_InitiateAcquisition
with the following parameter:
vi
: The instrument handle from
niScope_init
LabVIEW VI
C/C++ Function Call
Call
niScope_FetchMeasurement
with
the following parameters:
vi
: The instrument handle from
niScope_init
timeout
:
1.0
channelList
:
"0"
scalarMeasFunction
:
NISCOPE_
VAL_VOLTAGE_AVERAGE
error
a
b
–
c
d
–
------------
1
–
100
×
=