Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 207
RF Assembly
A3 RF Assembly Troubleshooting
Microwave Instruments (N5173B, N5183B)
If the instrument is having a power level issue below 3.2 GHz it will need to be
isolated to either the A3 RF assembly or the A7 Micro-Deck assembly. If there
is a power level issue at 3.2 GHz and above, see the “N5173B, N5183B”
section in the “Synthesizer Multiplier / Divider Section” in this chapter.
To isolate a signal level issue less than 3.2 GHz between the A3 RF assembly
and the A7 Micro-Deck assembly use the following procedure:
1. Return the instrument to a known state by pressing Preset.
2. Turn the automatic leveling control off by pressing AMPTD, ALC Off.
3. Set power search to manual by pressing Power Search, Power Search,
Manual.
4. Turn the output power on by pressing RF On/Off so that the LED below it
comes on.
5. Referring to Figure 10-5, remove semi-rigid cable W20 from A3 J2002.
Figure 10-5 RF Output Section Output - Microwave
6. Tune the instrument to a frequency and amplitude level that exhibits the
power level issue.
7. Connect a spectrum analyzer to A3 J2002.
8. Configure the spectrum analyzer with the following settings:
— Center Frequency = Frequency of signal source
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