Keysight Technologies E8257D User Manual

128 E8257D/67D, E8663D PSG Signal Generators Service Guide
Troubleshooting
Troubleshooting Harmonic Spurious
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 on page 127.
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.
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 harmonics do not meet specification, replace the A29 20 GHz Doubler.

Keysight Technologies E8257D Specifications

General

Brand	Keysight Technologies
Model	E8257D
Category	Portable Generator
Language	English