NI PXI-5650/5651/5652 Calibration Procedure | © National Instruments | 23
Verifying Subharmonics on the PXI-5652 at 0 dBm (Functional
Test)
Complete the following steps to verify the subharmonic levels of an PXI-5652 RF signal
generator using a spectrum analyzer:
This verification is valid only for the PXI-5652 RF signal generator.
1. Connect the PXI-5652 REF IN/OUT front panel connector to the rubidium 10 MHz
frequency reference signal.
2. Connect the 6 dB precision attenuator to the PXI-5652 RF OUT front panel connector.
3. Connect the spectrum analyzer RF INPUT connector to the 6 dB precision attenuator.
4. Connect the rubidium 10 MHz frequency reference signal to the spectrum analyzer
10 MHz REF IN rear panel connector.
5. Configure the spectrum analyzer with the following settings:
• Center frequency: 3.3 GHz
• Reference level: +5 dBm
• Resolution bandwidth: 1 kHz
• Span: 500 kHz
• Reference Clock source: External
6. Generate a single-sideband signal after setting the following NI-RFSG properties:
• Frequency (Hz): 3.3 GHz
• Power Level (dBm): 0 dBm
• Generation Mode: CW
• Reference Clock source: RefIn
7. Measure the peak power of the fundamental tone using the spectrum analyzer and record
the value.
8. Reconfigure the spectrum analyzer with the following settings:
• Center frequency: Half the frequency used in step 5
• Reference level: +5 dBm
• Resolution bandwidth: 1 kHz
• Span: 500 kHz
• Reference Clock source: External
9. Measure the peak power of the half harmonic and 1.5x harmonics using the spectrum
analyzer with the settings from step 8 and record the values.
10. Subtract the measurement in step 7 from the measurements in step 9.
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