Matrix Switching Basics
2-5
7001 Switch System mainframe will accommodate up
to two cards, and up to six mainframes can be connect-
ed together. Thus, a switch system using as many as 12
cards in six mainframes can be conÞgured.
2.4.1 Two-card switching systems
Each Model 7001 Switch System mainframe can ac-
commodate two cards to allow the following switching
conÞgurations.
Figure 2-7
SMU connections
Output HI
Guard
Sense HI
Guard
Rows Columns
7012
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.
2.3.4 SMU connections
Figure 2-7 shows how a Keithley Model 236, 237 or 238
Source Measure Unit could be connected to the matrix
card. By using triax cables that are unterminated at one
end, the driven guard and chassis ground are physical-
ly extended all the way to the card.
2.4 Matrix expansion
With the use of additional matrix cards and main-
frames, larger matrices can be conÞgured. Each Model
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