Table 8. RF OUT Amplitude Accuracy Test Settings (Continued)
Power Level
(dBm)
Start Frequency
(MHz)
Stop Frequency
(MHz)
Frequency Step
(MHz)
-10
0.25
0.25
—
250
20,000
250
4.
Configure the PXIe-5654 using the following settings:
•
Frequency: Frequency from the list in step 3
•
Power Level: 10 dBm, which is the
Expected Power (dBm)
5.
Commit the settings to hardware if this is the first iteration of running this procedure;
otherwise skip to step 8.
6.
Initiate signal generation.
7.
Enable the RF output.
8.
Check the signal generation status and verify that there are no reported errors or
warnings.
9.
Measure the PXIe-5654 RF OUT front panel connector power using the power meter.
Correct the power meter reading for the RF frequency.
This measurement is the
Measured Power (dBm)
.
10. Calculate the
Power Deviation (dB)
using the following formula:
Power Deviation (dB)
=
Measured Power (dBm)
-
Expected Power (dBm)
11. Verify that the
Power Deviation (dB)
results in the previous step are within the limits
listed in the following table.
Table 9. RF OUT Amplitude Accuracy Limits
Frequency
As-Found Limit
As-Left Limit
250 kHz to 250 MHz
±2.0 dB
±2.0 dB
>250 MHz to 20 GHz
±1.5 dB
±1.5 dB
12. Repeat steps 4 through 11 for each test frequency, in the current output power level, in the
list created in step 3.
13. Repeat steps 4 through 12 for the remaining output power levels for each test point in the
list created in step 3.
14. Close the device session.
Verifying RF OUT Minimum Power
This procedure verifies that the internal signal generation circuitry can produce the correct
minimum output power.
1.
Connect the power sensor to the PXIe-5654 RF OUT front panel connector as shown in
the following figure.
PXIe-5654 Calibration Procedure
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© National Instruments
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