![background image](http://html1.mh-extra.com/html/national-instruments/ni-pci-5122/ni-pci-5122_calibration-procedure_709868021.webp)
NI 5122/5124/5142 Calibration Procedure
|
© National Instruments
|
21
15. 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. This value is the
Measured Negative Voltage
used in step 16.
16. Calculate the error in the programmable vertical offset as a percentage of input using the
following formula:
error = (((
a
-
b
) / 1.5) - 1) * 100
where
a
= the
Measured Positive Voltage
b
= the
Measured Negative Voltage
Compare the resulting percent to the
Calibration Test Limits
or the
Published
Specifications
listed in Table 9 (NI 5122/5142) and Table 10 (NI 5124). If the result is
within the selected test limit, the device has passed this portion of the verification.
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_FetchMeasurement
with the following parameters:
timeout
:
1.0
vi
: The instrument handle from
niScope_init
channelList
:
"0"
scalarMeasFunction
:
NISCOPE_VAL_VOLTAGE_AVER
AGE
Table 9.
NI 5122/5142 Programmable Vertical Offset Accuracy Limits
NI PXI/PXIe-5122 and NI PXI-5142
NI PCI-5122/5142
Calibration Test
Limits
Published
Specifications
Calibration Test
Limits
Published
Specifications
±0.36%
±0.4%
±0.36%
±0.5%