Multiplexer Bank-To-Bank Jumpers; Backplane Jumpers - Keithley 7021 Instruction Manual

Multiplexer Configuration

Multiplexer bank-to-bank jumpers

Jumpers are installed on the connector card to connect mul-
tiplex banks together to form a 1 × 30 multiplexer. Each
jumper set connects two adjacent banks together. These
jumper sets are included with the Model 7021.
The bank-to-bank jumpers allow you to configure the multi-
plexer in a variety of ways. Typical multiplexer configura-
tions include:
Dual 1 × 12 and 1 × 18 multiplex banks; no jumpers in-
•
stalled (Figure 2-2).
One 1 × 30 multiplex bank; all bank-to-bank jumpers in-
•
stalled (Figure 2-3).
Refer to Section 4 for information on installing bank-to-bank
jumpers.
Inputs
2
1
Bank A
2
12
2
1
Bank B
2
18
Figure 2-2
Dual 1 × 12 and 1 × 18 multiplexer configuration (jumpers
not installed)
Inputs
2
1
Bank A
2
12
2
1
Bank B
2
18
Figure 2-3
One 1 × 30 multiplexer configuration (jumpers installed)
2-2
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Backplane jumpers

There are four pairs of backplane jumpers located on the re-
lay card. With the jumpers installed, the multiplex banks of
one card connect to the multiplex banks of a second card
through the analog backplane of the Model 7001/7002 main-
frame, which expands the number of inputs. With the jump-
ers removed (cut), the multiplexer is isolated from another
card installed in the mainframe.
The three-pole analog backplane of the Model 7001/7002
mainframe is shown in Figure 2-4. The GUARD connection
of the analog backplane is found only on the mainframe and
is not used with the Model 7021 or Model 7022 card.
Through this analog backplane, the banks of a Model 7021
installed in one slot can be connected to the banks (or rows)
of a compatible card installed in an adjacent slot.
2
Output A
2
Output B
2
Output A
2
Figure 2-4
2
Model 7001/7002 analog backplane
Jumpers
Model 7001/7002
Card 1
Analog
Backplane
Bank A
H
L
G
Bank B
H
L
G
Bank C
H
L
G
Bank D
H
L
G
= High
H
L = Low
=
G Guard
Card 2
H
L
G
H
L
G
H
L
G
H
L
G