138 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
Troubleshooting
Unleveled Issues
5 MHz to <2.0 GHz
2.0 GHz to <3.2 GHz
3.2 GHz to Maximum Frequency limit
5 MHz to <2.0 GHz
In this frequency range both the ALC detector and modulators used are located
on the A3 RF assembly. However, the ALC reference DAC, integrator, and
summing amplifier are all located on the A7A1 Microwave ALC control
assembly. Use the following procedure to isolate an internal ALC unlevel
condition in this frequency range:
1. Return the instrument to a known state by pressing Preset.
2. Tune the signal generator to 1 GHz by pressing FREQ, 1 GHz.
3. Turn the RF on by pressing RF On/Off so that the LED below it comes on.
4. Set the power level to +10 dBm by pressing AMPTD, 10 dBm.
5. Turn the attenuator hold on and by pressing AMPTD, Atten/ALC Control,
Atten Hold On.
6. Verify that the Set Atten setting is set to 0 dB.
7. Referring to Figure 6-2, Remove W20 from A3 J2002 and W23 from A3
J6000.
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