3.
Configure the signal generator to generate a sine waveform with the following
characteristics:
•
Frequency: the Test Point Frequency value from the
Flatness and Bandwidth
Verification
table
•
Amplitude level: the Test Point Amplitude value from the
Flatness and Bandwidth
Verification
table
4.
Configure the power sensor to correct for the Test Point Frequency using the power
sensor frequency correction function.
5.
Use the power sensor to measure the power in dBm. Record the result as
measured input
power
.
6.
Calculate the corrected input power using the following equation:
corrected input power
=
measured input power
+
splitter imbalance
Note
Select the
splitter imbalance
value from the list of test points from the
Test System Characterization
section for the current Test Point Frequency.
7.
Use the NI 5170R to acquire and measure the power using the Extract Single Tone
Information VI, converting the result from V
pk
to dBm. Record the result as
device input
power
.
8.
If the Test Point Frequency value from the
Flatness and Bandwidth Verification
table is
50 kHz, proceed to step 9. Otherwise, proceed to step 11.
9.
Calculate the
power reference
using the following equation:
power reference
=
device input power
-
corrected input power
10. Proceed to step 13. The power error is not calculated for this configuration.
11. Calculate the
power error
using the following equation:
power error
=
device input power
-
corrected input power
-
power reference
12. Compare the power error to the appropriate Limit from the
Flatness and Bandwidth
Verification
table.
13. Repeat steps 2 through 12 for each configuration in the
Flatness and Bandwidth
Verification
table.
14. Connect splitter output 2 of the power sensor assembly to channel 1 of the NI 5170R and
repeat steps 2 through 12 for each configuration listed in the
Flatness and Bandwidth
Verification
table.
15. Connect splitter output 2 of the power sensor assembly to channel 2 of the NI 5170R and
repeat steps 2 through 12 for each configuration listed in the
Flatness and Bandwidth
Verification
table.
16. Connect splitter output 2 of the power sensor assembly to channel 3 of the NI 5170R and
repeat steps 2 through 12 for each configuration listed in the
Flatness and Bandwidth
Verification
table.
Note
If you are verifying the NI 5170R (8CH), proceed to the following step.
If you are verifying the NI 5170R (4CH), flatness and bandwidth verification is
complete.
20
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NI PXIe-5170R Calibration Procedure
