Agilent N5161A/62A/81A/82A/83A MXG Signal Generators Service Guide
Troubleshooting
Troubleshooting Harmonic Spurious
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Figure 1-30 +5.1V and +/-15V
• If the voltages are within limits, the A1 Power Supply is not at fault. Replace the A3 RF assembly.
• If any voltages are incorrect, the faulty assembly could be either the A1 Power Supply or the A3 RF assembly.
a. Replace the A1 Power Supply
1
.
b. Repeat step 1.
c. If the voltages are still incorrect replace the A3 RF assembly.
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 generator, that particular harmonic is not specified or
measured.
• If the frequency of a harmonic falls within the frequency range of the signal 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.
1
If you replaced the A1 Power Supply, but the A3 RF assembly was the faulty assembly, you can return the new A1 Power Supply to Agilent.
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