E8257D/67D, E8663D PSG Signal Generators Service Guide 127
Troubleshooting
Troubleshooting Harmonic Spurious
Troubleshooting Harmonic Spurious
Harmonics are multiples of the output frequency. The second harmonic should
be two times the output frequency at an x dBc down. This section contains
procedures for checking spurious harmonic emission levels to make sure they
are within specifications.
To measure harmonics that fall within the signal generator frequency range,
set the signal generator and spectrum analyzer to the harmonic frequency and
set the signal generator to a specified power level. Measure the output signals
peak power level on the spectrum analyzer. This peak power level is the
reference level for the harmonic measurement. Turn on Marker Delta, set the
signal generator to the fundamental frequency, and measure the power level of
the fundamental frequency. The dBc value is the difference between the
fundamental peak power level and the harmonic frequency power level.
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)
If the harmonic falls beyond the frequency range of the signal generator, the
harmonic is not specified or measured.
Table 1-25 Harmonic Specifications
Harmonic Specifications
< 10 MHz –28 dBc
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
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