Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 209
RF Assembly
A3 RF Assembly Troubleshooting
Before replacing an A3 RF assembly for a RF Output section Self Test failure be
sure run the “RF Output Related Adjustments” listed later in this section. Also,
be sure to verify the power supply voltages by seeing the “Power Supply
Status Quick-Check” section in Chapter 8, “Power Supply”
RF Output Related Adjustments
There are seven RF Output section related adjustments in the performance
verification and adjustment software. They are:
1. ALC Linearity Calibration
This adjustment is used to linearize the ALC circuitry.
2. Absolute Power Calibration
This adjustment is used to find the power level associated with the mid
vernier point. It also finds the correction factors for the 0 and 5 dB
attenuator steps.
3. Op Amp Band Power Calibration
This adjustment is used to set the Op-Amp band power gain and offset
values.
4. ALC Calibration
This adjustment is used to fill the power versus ref DAC lookup table.
5. Attenuator Calibration
This adjustment is used to find the amplitude correction for each
attenuator step.
6. Open Loop Power Calibration
This adjustment is used to align the ALC open loop performance with the
closed loop accuracy.
7. Op Amp Band Attenuator Calibration
This adjustment is used to find the amplitude correction for each
attenuator step in the Op-Amp band.
Automatic Level Control Section
If there are any ALC issues, see “Unleveled Issues” in Chapter 6,
“Troubleshooting”
Function Generator / Trigger Control Section
There are three section in the Function Generator / Trigger Control Section that
will be covered in this section. They are:
— LF Function Generator
— Trigger Control
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