Agilent N5161A/62A/81A/82A/83A MXG Signal Generators Service Guide
Troubleshooting
Troubleshooting Non-Harmonic Spurious
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Troubleshooting Non-Harmonic Spurious
Non-harmonic spurious responses are unwanted signals that are not related to the fundamental output frequency but are produced by the
internal frequency synthesis section of the signal generator. There are many different groupings a spur can fall into. The grouping determines
what assembly is most likely generating the spur.
Spur types for this signal generator are noted in Table 1-13. To troubleshoot spurs:
1. Identify the grouping based on failing a specified performance test.
2. Check for loose or broken cables and castings.
3. Replace the assembly.
Table 1-13
Type of Spur Options Description Replace
Reference Spurs All These spurs are generated
by the 10 MHz frequency
reference on the A3 RF
assembly.
A3 RF assembly
a
a
After replacing the A3 RF assembly in a model N5183A instrument, go to Chapter 4, "Post-Repair Procedures and Performance Verification".
Mixing Spurs All These spurs are generated
by the mixing products of
the RF and IF signals on
the A3 RF assembly. The
signal generator is tuned to
a frequency in the
Heterodyne band
(≤250 MHz) to measure
these spurs.
A3 RF assembly
a
Power Supply Spurs All These spurs are generated
by the power supply
switching at a 120 kHz
rate.
A1 Power Supply
LO Feedthru Spurs All These spurs are generated
by the LO signal passing
through the mixer in the
Heterodyne band.
A3 RF assembly
a
RF Feedthru Spurs All These spurs are generated
by the RF signal passing
through the mixer in the
Heterodyne band.
A3 RF assembly
a
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