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Multiplexer Configuration
2-5
SMU connections
Figure 2-9 shows how to connect a Keithley Model 236, 237,
or 238 Source Measure Unit to the multiplexer. By using tri-
ax cables that are unterminated at one end, the driven guard
and chassis ground are physically extended all the way to the
card.
Multiplexer expansion
With the use of additional switching cards and mainframes,
larger systems can be configured. Each Model 7001 switch
system mainframe can accommodate up to two cards, and up
to six mainframes can be connected together. With this
switch system, up to 12 cards can be configured. Each Model
7002 switch system mainframe can accommodate up to ten
cards. And, by connecting up to six Model 7002 mainframes,
60 cards can be configured. The limits on the number of
cards in the Model 7001/7002 are due to triggering.
Multiple-card switching systems
The Model 7001/7002 switch system mainframes can ac-
commodate two and ten cards, respectively. The following
paragraphs use a two-card system to illustrate multiple-card
switching configurations.
Figure 2-9
SMU connections
Output HI
Guard
Sense HI
Guard
Bank A
7021
H
L
H
L
DUT
Sense LO
Output LO
Output LO
236/237/238
Triax
Cables (3)
WARNING
: Hazardous voltages may be present on
GUARD. Make sure all cable shields are
properly insulated before applying power.
Out
Out
Bank B
In
In
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Summary of Contents for 7021
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