4.
Configure the function generator and generate a waveform with the following
characteristics:
•
Waveform: Sine wave
•
Amplitude: The Test Point value from the
AC Amplitude Accuracy Verification
table
•
Frequency: 50 kHz
•
Load impedance: 50 Ω
Note
These values assume you are using a NI 5402 function generator. For
other function generators, the output voltage varies with load output impedance,
up to doubling the voltage for a high impedance load.
5.
Wait 1 second for the output of the function generator to settle.
6.
Measure and record the amplitude using the Extract Single Tone Information VI for the
NI 5170R.
7.
Measure and record the amplitude for the DMM.
Note
The Extract Single Tone Information VI returns an amplitude result in
V
pk
, but the DMM will return the amplitude as V
rms
. Convert the results to the
same unit before calculating error.
8.
Calculate the amplitude error using the following formula:
AC Voltage Error
= 20 × log
10
(V
NI 5170R Measured
/V
DMM Measured
)
9.
Compare the amplitude error to the appropriate Limit from the
AC Amplitude Accuracy
Verification
table.
10. Repeat steps 2 through 8 for each configuration listed in the
AC Amplitude Accuracy
Verification
table.
11. Connect the DMM and function generator to channel 1 of the NI 5170R as shown in the
AC Verification Test Connections
figure and repeat steps 2 through 9 for each
configuration listed in the
AC Amplitude Accuracy Verification
table.
12. Connect the DMM and function generator to channel 2 of the NI 5170R as shown in the
AC Verification Test Connections
figure and repeat steps 2 through 9 for each
configuration listed in the
AC Amplitude Accuracy Verification
table.
13. Connect the DMM and function generator to channel 3 of the NI 5170R as shown in the
AC Verification Test Connections
figure and repeat steps 2 through 9 for each
configuration listed in the
AC Amplitude Accuracy Verification
table.
Note
If you are verifying the NI 5170R (8CH), proceed to the following step.
If you are verifying the NI 5170R (4CH), AC amplitude accuracy verification is
complete.
14. Connect the DMM and function generator to channel 4 of the NI 5170R as shown in the
AC Verification Test Connections
figure and repeat steps 2 through 9 for each
configuration listed in the
AC Amplitude Accuracy Verification
table.
15. Connect the DMM and function generator to channel 5 of the NI 5170R as shown in the
AC Verification Test Connections
figure and repeat steps 2 through 9 for each
configuration listed in the
AC Amplitude Accuracy Verification
table.
16. Connect the DMM and function generator to channel 6 of the NI 5170R as shown in the
AC Verification Test Connections
figure and repeat steps 2 through 9 for each
configuration listed in the
AC Amplitude Accuracy Verification
table.
NI PXIe-5170R Calibration Procedure
|
© National Instruments
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17
