
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
Summary of Contents for E4418A
Page 20: ...Contents 4 HP EPM 441A 442A Service Guide 4402serv book Page 4 Monday March 11 2002 11 34 AM ...
Page 22: ...Contents 6 HP EPM 441A 442A Service Guide 4402serv book Page 6 Monday March 11 2002 11 34 AM ...
Page 24: ...Contents 8 HP EPM 441A 442A Service Guide 4402serv book Page 8 Monday March 11 2002 11 34 AM ...
Page 25: ...1 Specifications 4402serv book Page 1 Monday March 11 2002 11 34 AM ...
Page 41: ...2 Performance Tests 4402serv book Page 1 Monday March 11 2002 11 34 AM ...
Page 59: ...3 Adjustments 4402serv book Page 1 Monday March 11 2002 11 34 AM ...
Page 71: ...4 Theory of Operation 4402serv book Page 1 Monday March 11 2002 11 34 AM ...
Page 85: ...5 Replaceable Parts 4402serv book Page 1 Monday March 11 2002 11 34 AM ...
Page 108: ...Index 4 HP EPM 441A 442A Service Guide 4402serv book Page 4 Monday March 11 2002 11 34 AM ...