Keithley 7077, Instruction Manual

Page: 26 / 62

Operation
2-13
2.6.3 Multiple switching matrix system
Figure 2-14 shows a system using eight matrix cards, requir-
ing two Model 707s daisy-chained together. In this configu-
ration, instrumentation and DUTs are connected to matrix
card columns. A single cable is used to connect each row of
the master Model 707 Switching Matrix to the corresponding
row of the slave. Use a modified or custom cable as short as
possible especially if path resistance is a critical factor. Sim-
ilarly in Figure 2-15, two Model 708 Switching Matrices are
daisy-chained together.
2.6.4 Matrix/multiplexer system
Figure 2-16 shows an example of how the Model 7077 is
used with a multiplexer card (Keithley Model 7075) in the
same test system. In this example, the Model 7077 is config-
ured as an 8
×
12 matrix and the Model 7075 is configured as
a quad 1
×
24 multiplexer. In this test system, the matrix card
provides 24 columns for the DUT or additional instrumenta-
tion. By using the multiplexer card in the system, 96 addi-
tional test lines become available. Different multiplexer card
bank jumper/backplane jumper combinations in the Model
7075 can provide different pin outs for the same quad 1
×
24
multiplexer configuration. Different multiplexer configura-
tions are easily accomplished. For example (refer to Figure
2-16), removing backplane jumpers for rows C and F, and in-
stalling bank jumpers B to C and F to G will configure the
card as a dual 1
×
48 multiplexer.