Theory of Operation
A1 Power Supply
HP EPM-441A/442A Service Guide 4-3
A1 Power Supply
The power supply is a 40 W, 47 to 63 Hz switching power supply which
produces three voltages (+5V, +12V and -12V).
The mains fuse can be changed easily since it is located in the line input
module on the power meter’s rear panel (HP Part Number 2110-0957).
The fuse holder contains a spare fuse as standard on shipment.
In addition there is also a fuse on the power supply assembly (HP Part
Number 2110-0957). However, a transient suppressor is fitted to the line
input module so that any mains transient blows the line module fuse
before the power supply fuse. If the power supply fuse blows there is a
fault within the power meter.
4402serv.book Page 3 Monday, March 11, 2002 11:34 AM
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