National Instruments PXI, Manual

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NI 5114 Calibration Procedure | © National Instruments | 17
13. Fetch a waveform from the device and perform a voltage average measurement using the
niScope Fetch Measurement (poly) VI. Select the Measurement Scalar DBL instance of the
VI. This value is the
Measured Negative Voltage used in step 14.
14. 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 Published Specifications column listed in
Table 6. 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 5.
16. Move the calibrator test head to the device input channel 1 and repeat steps 2 through 15
for every iteration in Table 6, changing the value of the channelList parameter from
"0"
to
"1"
.
17. 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 :
"0"
scalarMeasFunction :
NISCOPE_
VAL_VOLTAGE_AVERAGE
LabVIEW VI C/C++ Function Call
Call
niScope_close
with the
following parameter:
vi : The instrument handle from
niScope_init
error
a b
–
c d
–
------------
 
 
1
–
 
 
100
×
=