Keysight FieldFox Handheld Analyzers Service Guide 75
Theory of Operation
Grounding and Power
— Source—switched off during SA mode, switched off between sweeps during
CAT or NA modes.
— 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
port mode.
— Reflectometer—switched to low power through state when RF OUT port
receivers are inactive.
— 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.
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