14 | ni.com | NI PXI-5650/5651/5652 Calibration Procedure
7. Measure the maximum power within the configured span of the spectrum analyzer and
record this data. Reference this measurement for steps 8 through 13.
8. Reconfigure the spectrum analyzer with the following settings:
• Frequency: 500 MHz + 10 kHz offset
• Reference level: Value measured in step 7
• Resolution bandwidth: 10 Hz
• Frequency span: 100 Hz
• Reference Clock source: External
• Level range: Log 120 dB
• Trace averaging: 20 traces
9. Measure the mean value within the configured span of the spectrum analyzer and record
this value.
10. Apply the following equation to the value measured in step 9:
phase noise
SSB
at 10 KHz offset = Measurement - 10log(RBW)
where
Measurement = value measured in step 9
RBW = resolution bandwidth
11. Subtract the measurement recorded in step 7 from the value calculated in step 10.
12. Verify that the value calculated in step 11 meets the Test Limit as specified in Table 6.
13. Repeat steps 5 through 12 for the remaining frequencies listed in the Frequency column in
Table 6, if applicable to the device.
Table 6. Single Sideband Phase Noise at 10 kHz Offset
Device Frequency Test Limit (dBc/Hz)
PXI-5650/5651/5652 500 MHz <-111
1 GHz <-105
PXI-5651/5652 2 GHz <-98
3 GHz <-95
PXI-5652 4 GHz <-93
5 GHz <-90
6.6 GHz <-90
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