Two-Card System - Keithley 7021 Instruction Manual

When using a single-card system, make sure that the card re-
mains electrically isolated from any other switching cards.
There are several ways to ensure isolation for a single card in
the Model 7001/7002 mainframe:
1. Vacate the adjacent slot in the mainframe. If there is a
Model 70XX card installed in the other slot, remove it.
2. Remove the backplane jumpers on the card. This will
disconnect the card from the analog backplane of the
mainframe.
3. Remove the backplane jumpers from the switching card
installed in the adjacent slot.
HI and LO to
Banks A and B
Instrument
1
DUTs
Figure 4-14
Two-card system example
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7011-MTC-2
Cable Assembly
(Cut in half to
provide two cables)
30
DUT Test Fixture
Card 1 (1x30)
1
1
30
30
Card 2 (1x30)
31
31
60
60
Single 1x60 Multiplexer
Simplified Equivalent Circuit

Two-card system

Figure 4-14 shows a system using two Model 7021 cards in-
stalled in one Model 7001/7002 mainframe to configure a
single 1 × 60 multiplexer system. Each card is configured as
a single 1 × 30 multiplexer. To accomplish this, all bank-to-
bank jumpers (both cards) are installed to connect banks A
and B together. By leaving the backplane jumpers of both
cards installed, the banks of card 1 are connected to the
banks of card 2 through the analog backplane of the main-
frame resulting in the 1 × 60 configuration.
7001/7002
7021
7021
31
Notes: 1. All bank-to-bank jumpers
(both cards) must be installed.
2. Backplane jumpers (both
cards) must be installed.
Instruments
7001/7002
Analog
Backplane
Card Connections and Installation
C
A
R
D
1
C
A
R
D
2
60
4-11