Keysight Technologies FieldFox N9913A Service Manual page 75

Theory of Operation
Grounding and Power
— Source—switched off during SA mode, switched off between sweeps during
— LO—switched off when data is not being taken by receivers.
— SA—switched off when in one port CAT or NA modes, on all the time in two
— Reflectometer—switched to low power through state when RF OUT port
— High-Band Pre-amp—switched off when not required.
On the A5 System board, each of the ADC's may be individually switched to a
low power mode when not active.
Load switching is generally transparent to the user. One obvious exception is
the that the source turns off during "retrace" in the CAT and NA modes.
Keysight FieldFox Handheld Analyzers Service Guide
CAT or NA modes.
port mode.
receivers are inactive.
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