![background image](http://html.mh-extra.com/html/national-instruments/5124/5124_calibration-procedure_710197022.webp)
NI 5122/5124 Calibration Procedure
22
ni.com
14. Call
niScope_FetchMeasurement
(niScope Fetch
Measurement VI) with the following parameters:
•
channelList
:
"0"
•
timeout
:
1.0
•
scalarMeasFunction
:
NISCOPE_VAL_VOLTAGE_AVERAGE
15. Compute the error in the programmable vertical offset as a percentage
of input using the formula:
error = (((
a
–
b
) / 1.5) – 1) * 100
where
a
is the measured positive voltage and
b
is the measured
negative voltage.
Compare the resulting percent to the Calibration Test Limits or the
Published Specifications listed in Table 8. If the result is within the
selected test limit, the device has passed this portion of the verification.
16. Move the calibrator test head to the digitizer input channel 1 and repeat
steps 1 through 15, replacing
"0"
with
"1"
for the
channelList
parameter.
You have finished verifying the programmable vertical offset accuracy of
the NI 5122/5124.
Timing Accuracy
Complete the following steps to verify the timing accuracy for the
NI 5122/5124.
1.
Call
niScope_ConfigureChanCharacteristics
(niScope
Configure Chan Characteristics VI) with the following parameters:
•
channelList
:
"0"
•
inputImpedance
:
NISCOPE_VAL_50_OHM
•
maxInputFrequency
:
20,000,000
2.
Call
niScope_ConfigureVertical
(niScope Configure
Vertical VI) with the following parameters:
•
channelList
:
"0"
•
range
:
2.0
•
offset
:
0.0
Table 8.
NI 5122/5124 Programmable Vertical Offset Accuracy
Calibration Test Limits
Published Specifications
±0.36%
±0.4%