Theory of Operation 4
Keysight E4416A/E4417A Power Meters Service Guide 87
A1 Power Supply
The A1 power supply/battery charger is a 20 W, 47 to 440 Hz switching power
supply producing three DC voltages, (+5 V, +12 V, −12 V). It is used to power the
subassemblies when operating from an ac power source. The power supply can be
driven by AC power voltages in the range 85 to 264 V.
Power is distributed to the meter subassemblies via the processor assembly
(For further information refer to “A2 Processor Assembly” on page 88).
The ac line fuse is located in the line input module on the power meter's rear
panel (Keysight Part Number 2110-0957). The fuse holder contains a spare fuse
as standard on shipment.
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