Table of Contents
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2.1
Introduction
This section covers the basics for matrix switching and
is arranged as follows:
Basic matrix conÞguration: Covers the basic 4 ×
2.2
10 matrix conÞguration. The signiÞcance of the
backplane jumpers is also covered here.
2.3
Typical matrix switching schemes: Explains
some of the basic ways a matrix can be used to
source or measure. Covers single-ended switch-
ing, differential (ßoating) switching, and sensing.
2.4
Matrix expansion: Discusses the various matrix
conÞgurations that are possible by using multi-
ple cards.
2.2
Basic matrix configuration (4
A simpliÞed schematic of the Model 7012 matrix card
is shown in Figure 2-1. The card is conÞgured as a 4 ×
10 matrix. Each of the 40 crosspoints is made up of a
two-pole switch. By closing the appropriate crosspoint
switch, any matrix row can be connected to any col-
umn in the matrix.
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Matrix Switching Basics
×
10)
Column
1
2
3
4
5
6
1
2
Rows
3
4
Crosspoint (1 of 40)
HI
LO
Figure 2-1
Model 7012 simplified schematic
Backplane jumpers
Notice in Figure 2-1 there are four pairs of backplane
jumpers located on the relay card. With the jumpers in-
stalled, the matrix card is connected to the analog back-
plane of the Model 7001 allowing matrix expansion
with a second 7001 card installed in the mainframe.
With the jumpers removed (cut), the matrix card is iso-
lated from another card installed in the mainframe.
2
7
8
9
10
To 7001
Analog
Backplane
Backplane
Jumpers
(4 pairs)
2-1
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