Keysight Agile Signal Generator Service Guide 55
Troubleshooting
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 1-7. 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 1-7 Non-Harmonic Spurious
Type of Spur Options Description Replace
Reference Spurs All These spurs are generated by the 10 MHz frequency
reference on the A11 Reference Module.
A11 Reference
Module
a
Mixing Spurs All These spurs are generated by the mixing products of
the RF and IF signals on the A12 DAC board.
A12 DAC board
a
Power Supply Spurs All These spurs are generated by the power supply
switching at a 120 kHz rate.
A2 Power Supply
a. After replacing these assemblies, go to Chapter 4, “Post-Repair Procedures and Operational
Performance Verification.”.
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