Instrument Turn On - Keysight Technologies X Series Service Manual

Power Supply
Assembly Overview
All analog voltages (VA) are referenced to the analog common (ACOM), and all
digital voltages (VD) are referenced to the digital common (DCOM). The +5.1
VSB supply is reference to the digital common.
The A1 Power Supply assembly also provides the following outputs:
— An independent variable voltage required to operate the four instrument
cooling fans.
— An AC line voltage output to supply the A7A1 Real Time Aux Power Supply.

Instrument Turn On

When the instrument turns the power supply on it pulls pin F24 of the control
connector to ground. When the power supply voltages are all up and working
without any errors the power supply will supply 5 V at pin E24.
Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 169