E8257D/67D, E8663D PSG Signal Generators Service Guide
Troubleshooting
Troubleshooting Harmonic Spurious
1-79
20 GHz Models
Use this procedure to troubleshoot harmonic problems with a fundamental frequency between 500 kHz and 3.2 GHz.
1. Set the signal generator as follows:
• Frequency: set to harmonic frequency to be measured
• Amplitude: +10 dBm
•ALC Off
• Amplitude Power Search (softkey)
2. Remove the cable on A30 Modulation Filter J3 (W27). Connect the spectrum analyzer to the cable.
3. Set the spectrum analyzer to the harmonic frequency, then press peak search and delta marker.
4. Set the signal generator to the fundamental frequency of the harmonic.
5. Using the delta marker, read the harmonic power level on the spectrum analyzer. Compare the spectrum analyzer
reading to the specifications in Table 1- 27 on page 1- 78.
6. If the harmonics do not meet specifications, replace the A8 Output.
7. If harmonic meet specifications reconnect the cable to the A30 Modulation Filter J3 and remove the cable going to
A30 Modulation Filter J2 (W31). Connect the spectrum analyzer to the A30 Modulation Filter J2.
8. Set the signal generator and spectrum analyzer to the harmonic frequency, then on the spectrum analyzer, press
marker peak search and then delta marker.
9. Set the signal generator to the fundamental frequency of the harmonic.
10. Using the delta marker, read the harmonic power level on the spectrum analyzer. Harmonic level should be
≤–55 dBc.
11. If the harmonic level is >–55 dBc, replace the A30 Modulation Filter.
20 GHz Models
Use this procedure to troubleshoot harmonic problems with a fundamental frequency between 3.2 GHz and 10 GHz.
1. Set the signal generator as follows:
• Frequency: set to harmonic frequency to be measured
• Amplitude: +10 dBm
•ALC Off
• Amplitude Power Search (softkey)
2. Remove the cable from the A29 20 GHz Doubler J2. Connect the spectrum analyzer to
A29 20 GHz Doubler J2.
3. Set the spectrum analyzer to the harmonic frequency, press marker peak search and then delta marker.
4. Set the signal generator to the fundamental frequency of the harmonic.
10 MHz to 2 GHz –30 dBc
10 MHz to 2 GHz (with Option 1EH filters
on)
–55 dBc
> 2 GHz to 20 GHz –55 dBc
> 20 GHz to 40 GHz (Option 540) –50 dBc
> 20 GHz to 44 GHz (Options 532 & 544) –45 dBc
> 20 GHz to 67 GHz (Options 550 & 567) –45 dBc
Table 1-27 Harmonic Specifications
Harmonic Specifications
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