Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 239
Micro-Deck Assembly
A8 BNC Bypass Board Troubleshooting
A8 BNC Bypass Board Troubleshooting
The intent of the A8 BNC Bypass board is to isolate ALC circuitry ground,
chassis ground, and external equipment ground from each other. Diodes are
used to shunt DC current and capacitors to remove interference components
to ground.
If the external ALC appears unstable or noisy, use a digital multimeter to verify
the bypass board is functioning properly. Using the ohm setting on your digital
multimeter, test the bypass board. There should be a minimum resistance,
typically ~100 ohms, between the outside barrel of the BNC and the chassis
ground.
— If the resistance is ~100 ohms the A8 assembly is good.
— If the resistance is not ~100 ohms, replace the A8 assembly.
Be sure to remove any cable connected to the rear panel ALC IN
connector before making this resistance measurement.
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