E8257D/67D, E8663D PSG Signal Generators Service Guide 131
Troubleshooting
Troubleshooting Harmonic Spurious
2. Remove the cable from the A30 Modulation Filter output going to the A36
Quadraplier (W107). 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 and record the harmonic power level on the
spectrum analyzer.
6. Reconnect the cable to the A30 Modulation Filter (J2) and remove the
cable from the A36 Quadraplier output (W112). Connect the spectrum
analyzer to the A36 Quadraplier (J3).
7. Set the signal generator and spectrum analyzer to the harmonic
frequency. Press marker peak search and delta marker.
8. Set the signal generator to the fundamental frequency of the harmonic.
9. Using delta marker, read the harmonic power level on the spectrum
analyzer. There should be a decrease in the harmonic power level from
what was measured in step 3, at the output of the A30 Modulation Filter. If
there isn’t, or if the decrease is less than 15 dB, replace the
A36 Quadraplier.
10.If the harmonics are decreased, replace the A30 Modulation Filter.
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