Theory of Operation
A4 Interface Assembly
4-8 HP EPM-441A/442A Service Guide
A4 Interface Assembly
The interface assembly contains the circuitry required for remote control
of the power meter. This assembly supports the HP-IB interface with a
protocol controller integrated circuit and two physical interface buffers.
The assembly is connected to data, address, and control signals from the
A2 processor assembly. The system clock from the A2 processor assembly
is divided by four to provide the HP-IB controller integrated circuit’s clock
signal.
The interface assembly also provides a filtered path for the recorder
output signal.
4402serv.book Page 8 Monday, March 11, 2002 11:34 AM
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