6
Principles of Operation
6-1
6.1
Introduction
This section contains a functional description of the Model
708A in block diagram form as well as details of the various
sections of the instrument. Information is arranged to pro-
vide a description of each of the functional blocks within the
instrument. Many of these descriptions include simplified
schematics and block diagrams. Component layout drawings
are located at the end of Section 8.
6.2
Overview
The Model 708A mainframe contains three circuit boards
and one power supply. Relay cards that plug into the main-
frame have analog circuits for signal paths and digital cir-
cuits for control. The block diagram in Figure 6-1 shows the
interconnection of the mother board, front panel control
board, display board, and backplane.
The following paragraphs describe Model 708A circuitry by
function. Some functions are controlled by more than one
board (e.g., relay control circuits and display circuits).
Line
Backplane
Mother
Board
Power
Supply
Front
Panel
I/O Board
Power
Backplane (possible)
Light
Pen
Master/Slave
Digital I/O
IEEE-488
External Trigger In
Matrix Ready Out
Figure 6-1
Model 708A block diagram
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Summary of Contents for 708A
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