130 E8257D/67D, E8663D PSG Signal Generators Service Guide
Troubleshooting
Troubleshooting Harmonic Spurious
— Frequency: set to harmonic frequency to be measured
— Amplitude +10 dBm
— ALC Off
— Amplitude Power Search (softkey)
2. Remove the cable from the A30 Modulation Filter J2 (W31). Connect the
spectrum analyzer to
A30 Modulation Filter J2.
3. Set the spectrum analyzer to the harmonic frequency and press marker
peak search and delta marker.
4. Set the signal generator frequency 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 on page 127.
6. If the harmonics do not meet specification, replace the A30 Modulation
Filter.
7. If the harmonics meet or exceed specification, reconnect the cable to the
A30 Modulation Filter J2 and remove the cable going to A27 40 GHz
Doubler output (W30). Connect the spectrum analyzer to the A27 40 GHz
Doubler J2.
8. Set the signal generator and spectrum analyzer to the harmonic
frequency. Press marker peak search and delta marker.
9. Set the signal generator to the fundamental frequency of the harmonic.
10.Using delta marker, read the harmonic power level on the spectrum
analyzer. Compare the spectrum analyzer reading to the specifications in
Table on page 127.
11.If the harmonics do not meet specification, replace the A27 40 GHz
Doubler.
50 and 67 GHz Models Only
Use this procedure to troubleshoot harmonic problems with a fundamental
frequency between 20 GHz and 25 GHz for Option 550, and between 20 GHz
and 33.5 GHz for Option 567.
1. Set the signal generator as follows:
— Frequency: set to harmonic frequency to be measured
— Amplitude +10 dBm
— ALC Off
— Amplitude Power Search (softkey)
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