72 Keysight FieldFox Handheld Analyzers Service Guide
Theory of Operation
Grounding and Power
5-
Grounding and Power
Grounding
Each printed circuit board has a single ground plane. The ground planes on the
A4 RF board and A5 System board are connected via the common shields at
multiple points. The ground plane on the A3 Front Panel Interface board is
connected to the ground plane on the A5 System board.
There are no separate grounds in the analyzer. There is no “star” ground point
in the analyzer.
Batt Neg and Ext DC neg are connected to the A5 System board ground plane.
The A2 LCD assembly has two separate grounding circuits: the LCD power and
control circuits and the backlight LED’s.
— The LCD power and control circuits share a ground that is connected to the
ground plane on the A5 System board.
— The ground for the backlight LED’s is connected to the ground plane on the
A3 Front Panel Interface board.
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