NI 5105 Calibration Procedure
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© National Instruments
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14. Fetch a waveform from the device 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 15.
15. Calculate the power difference using the formula:
power = (20log
10
a
) - (20log
10
b
)
where
a
is the
Measured RMS Voltage of Generated Sine Wave
b
is the
Measured RMS Voltage of the 50 kHz Sine Wave
If the result is within the test limits in Table 8, the device has passed this portion of the
verification.
16. Repeat steps 2 through 15 for each iteration listed in Table 8.
17. Move the calibrator test head to the next device input channel and repeat steps 2 through 16
for each of the remaining 7 channels. Update the
channelList
parameter to the appropriate
channel number each time.
18. End the session using the niScope Close VI.
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
: The name of the
channel being tested
scalarMeasFunction
:
NISCOPE_VAL_VOLTAGE_RMS
LabVIEW VI
C/C++ Function Call
Call
niScope_close
with the
following parameters:
vi
: The instrument handle from
niScope_init
