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NI 5122/5124/5142 Calibration Procedure
d.
Fetch a waveform from the digitizer and perform a voltage RMS measurement using
the niScope Fetch Measurement (poly) VI. Select the Measurement Scalar DBL
instance of the VI. This value is the
Measured RMS Voltage of Generated Sine Wave
used in step 11e.
e.
Calculate the power difference using the following formula:
power = (20log
10
a
) - (20log
10
b
)
where
a
= the
Measured RMS Voltage of Generated Sine Wave
b
= the
Measured RMS Voltage of 50 kHz Sine Wave
If the result is within the test limits from Table 12 (NI 5122/5142) or Table 13
(NI 5124), the device has passed this portion of the verification.
12. Repeat steps 2 through 11 for each iteration in Table 12 (NI 5122/5142) or Table 13
(NI 5124).
13. Move the calibrator test head to the digitizer input channel 1 and repeat steps 2 through 12,
changing the value of the
channelList
parameter from
"0"
to
"1"
.
14. End the session using the niScope Close VI.
LabVIEW VI
C/C++ Function Call
Call
niScope_Initiate
Acquisition
with the
following parameter:
vi
: The instrument handle from
niScope_init
LabVIEW VI
C/C++ Function Call
Call
niScope_Fetch
Measurement
with the
following parameters:
timeout
:
1.0
vi
: The instrument handle from
niScope_init
channelList
:
"0"
scalarMeasFunction
:
NISCOPE_VAL_VOLTAGE_R
MS
