Troubleshooting Harmonic Spurious; Troubleshooting Harmonic Spurious By Fundamental Frequency - Keysight N5171B EXG Service Manual

Troubleshooting

Troubleshooting Harmonic Spurious

Troubleshooting Harmonic Spurious
Harmonics are multiples of the fundamental output frequency produced by a
signal generator. Specifically, the second harmonic is two times the output
frequency and its amplitude is measured relative to the fundamental (carrier)
output frequency amplitude; the power lever of a harmonic is expressed as
-xx dBc.
— If the frequency of a harmonic falls beyond the frequency range of the signal
— If the frequency of a harmonic falls within the frequency range of the signal

Troubleshooting Harmonic Spurious by Fundamental Frequency

All mixing products and by-products are generated on the A3 RF assembly.
Harmonic spurious problems will most likely be associated with the A3 RF
assembly.
— Spurious harmonic levels beyond the published specifications of the
104
generator, that particular harmonic is not specified or measured.
generator, the harmonic's power level is obtained with the following
procedure:
1. Set the signal generator and spectrum analyzer to the same
harmonic frequency.
2. Set the signal generator to a specific power level. Its output peak
power level is measured on the spectrum analyzer; this peak power
level is the reference level used for the harmonic measurement.
3. Set the signal generator to the fundamental frequency. The power
level of the fundamental frequency is measured by using Peak Search
and Marker Delta.
This measurement obtains the power level of the harmonic and is
expressed as a dBc value; it is the difference between the
fundamental peak power level and the harmonic frequency power
level.
N5181B/82B require the replacement of the A3 RF assembly.
Keysight X-Series Signal Generators Service Guide