PXIe-5673E Calibration Procedure
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© National Instruments
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25
Verifying Single Sideband Phase Noise at 10 kHz Offset
Complete the following steps to verify the single sideband (SSB) phase noise of the PXIe-5673E
using a spectrum analyzer.
1.
Connect the PXIe-5611 RF OUT front panel connector to the spectrum analyzer RF INPUT
front panel connector through the SMA(m)-to-SMA(m) cable.
2.
Connect the PXIe-5650/5651/5652 REF IN/OUT front panel connector to any rubidium
frequency reference rear panel BNC connector through the BNC(m)-to-SMA(m) cable.
3.
Connect any available rubidium frequency reference rear panel BNC connector to the
spectrum analyzer REF IN rear panel connector through the BNC(m)-to-BNC(m) cable.
4.
Generate a single-sideband tone with a +3 MHz offset from the carrier signal with the
following niRFSG property settings:
•
Frequency (Hz): 1 GHz
•
Power Level (dBm): 0 dBm
•
Generation Mode: Arb Waveform
•
Reference Clock Source: RefIn
5.
Use the spectrum analyzer to measure the maximum power within the configured span of
the spectrum analyzer using the following spectrum analyzer parameter settings and record
the value:
•
Center frequency: (Frequency in step 4) + 3 MHz
•
Reference level: 0 dBm
•
Frequency span: 100 Hz
•
Resolution bandwidth: 10 Hz
•
Reference clock source: External
6.
Use the spectrum analyzer to measure the mean power within the configured span of the
spectrum analyzer using the following spectrum analyzer parameter settings and record the
value:
•
Center frequency: (Frequency in step 5) + 10 kHz
•
Reference level: 0 dBm
•
Frequency span: 100 Hz
•
Resolution bandwidth: 10 Hz
•
Reference clock source: External
•
Trace averaging: 20 traces
7.
Apply the following equation to the value measured in step 6:
Phase noise
SSB
at 10 kHz offset
=
Measurement
- 10log (
RBW
)
8.
Subtract the measurement recorded in step 5 from the value calculated in step 7.
9.
Verify that the value calculated in step 8 meets the limits as specified in Table 13.
