Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 235
Micro-Deck Assembly
A7 Micro-Deck Assembly Troubleshooting
This adjustment measures the absolute power at the mid-point of the ALC
vernier and generates a cross calibration file for the ALC calibration and
attenuator calibration. This adjustment also calibrates the first two
attenuator steps (bypass, 0 dB and 5 dB), covering the frequency range of
50 MHz to 40 GHz.
6. MW ALC Calibration
This adjustment calibrates the ALC Reference DAC values to
corresponding power levels.
7. MW Attenuator Calibration
This adjustment calibrates the accuracy of the attenuator steps 10
through 130 dB.
8. MW Open Loop Power Calibration
This calibration is used to align the ALC open loop performance with the
closed loop accuracy.
Rear Panel BNC Connectors
There are two rear panel BNC connectors associated with the A7 Micro-Deck
assembly, ALC IN and Z AXIS OUT. The following procedures can be used to
verify the functionality of each.
ALC IN
This procedure will verify the operation of the rear panel external ALC IN
connector. It will require the use of a 16 dB coupler, a negative crystal detector
(such as the ones used in these instruments for internal leveling), and a
spectrum analyzer.
This procedure assumes that the instrument is able to level its power when
using internal leveling. If this is not the case, resolve any internal leveling
problem before attempting to verify the operation of the external ALC IN
functionality.
1. Return the instrument to a known state by pressing Preset.
2. Tune the instrument to 10 GHz by pressing FREQ, 10 GHz.
3. Set the power level to 0 dBm by pressing AMPTD, 0 dBm.
4. Connect the input port of the directional coupler to the RF output of the
instrument.
5. Connect the detector to the coupled port of the directional coupler.
6. Connect the detector output to the rear panel ALC IN port.
7. Connect the coupler output to the spectrum analyzer input.
8. Setup the spectrum analyzer with the following settings:
— Center frequency = 10 GHz
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