Keithley 7077, Инструкция по эксплуатации

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Operation
2-9
Figure 2-10
Wide matrix expansion (16
×
12)
ROWS
A
H
ROWS
7077
(Slot 1)
7077
(Slot 4)
1 12
37 48
A
H
Columns
Externally
Connected
Together
2.5.4 Partial matrix implementation
A fully implemented matrix provides a relay at each poten-
tial crosspoint. For example, a fully implemented 16
×
24
matrix utilizing four Model 7077s contains 384 crosspoints.
A partially implemented matrix is obtained by removing one
Model 7077 from the switching matrix (Figure 2-11). The
partial matrix is still 16
×
24, but contains only 288 cross-
points. An advantage of a partial matrix is that fewer matrix
cards are needed. Also, by incorporating a partial matrix into
the design of the matrix, specific devices can be isolated
avoiding direct connection with an accidental crosspoint clo-
sure. For example, a source in Figure 2-11 cannot be con-
nected to DUT #2 with one “accidental” crosspoint closure.
Three specific crosspoints must be closed in order to connect
a source to DUT #2. Partial matrix expansion of a Model 708
Switching Matrix can be accomplished by externally ex-
panding the matrix (three Model 708s, two connected
through the backplane, one connected externally through the
matrix columns). Refer to paragraph 2.5.5 for information on
external mainframe matrix expansion for the Model 708
Switching Matrix.
Figure 2-11
Partial matrix example (16
×
24)
7077
(Slot 2)
A
H
A
H
7077
(Slot 1)
7077
(Slot 4)
1 12
DUT #1 DUT #2
13 24
Measure #1
Measure #2
Source #1
Source #2
Columns externally
connected together