Agilent Technologies Option H48 Multiport Test Set Z5623A - Manual (Page 125)

Agilent Technologies Z5623A Option H48 8 -3
Service
Theory of Operation
Theory of Operation
The theory of operation begins with a general description of the test set.
This is followed by more detailed operating theory. The operation of
each group is described briefly, to the assembly level only. Detailed
component-level circuit theory is not provided.
System Theory
Refer to Figure 8-1 on page 8-2 . The test set consists of three main
components: a power supply, front panel display, and main switch
board. The purpose of the power supply is to supply power to both the
front panel display and the main switch board. The front panel display
serves to indicate the switching paths to the user. Finally, the main
switch board does the actual switching between the different ports.
A1 Power Supply Theory
The switching power supply provides regulated dc voltages to power all
assemblies in the test set. A dc cable provides power to the main switch
board. A connector from the main switch board to the front panel
display provides dc power and control signals to the front panel. The
power supply provides the following supplies: +24 V, +12 V, +5 V.
The power LED on the front panel indicates that the instrument is on
and that the power supply is providing power.