Keysight FieldFox Handheld Analyzers Service Guide 57
Theory of Operation
Front Panel Group
There is an input inrush current control circuit on the Ext DC input that limits
inrush current to 4 amps.
Variable Voltage Source
This circuitry provides a constant voltage intended to bias circuits under test.
The user interface for controlling this function may be accessed via System >
System Configuration.
A2 LCD Assembly
The A2 LCD assembly contains a 6.5-inch, 640 x 480 TFT color LCD with
associated drive circuitry and backlight inverter.
The LCD backlight is created by LED’s connected in parallel stacks. Backlight
brightness is a function of the backlight power that ranges from 22 to 27 volts.
Refer to “LCD Backlight” on page 56 for more information.
The backlight LED’s are arranged along the top and bottom edges of the
display. There are three stacks on each edge.
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