Multiplexer Connections; Backplane Row Jumpers; Bankplane Row Jumper Removal; Bankplane Row Jumper Installation - Keithley 7021 Instruction Manual

Card Connections and Installation

Multiplexer connections

The following paragraphs provide the basic information
needed to connect your external test circuitry to the multi-
plexer. The removal and installation of the backplane row
jumpers on the relay card and the bank-to-bank jumpers on
the connector card are included.
WARNING
The following connection information is
intended to be used by qualified service
personnel. Failure to recognize and ob-
serve standard safety precautions could
result in personal injury or death.

Backplane row jumpers

The Model 7001/7002 mainframe has an analog backplane
that allows the multiplex banks of a Model 7021 to be inter-
nally connected to a compatible switching card installed in
the adjacent slot (See Section 2 for details).
The backplane row jumpers for the card are located on the re-
lay card as shown in Figure 4-1. The card is shipped from the
factory with the jumpers installed.
7021 Relay Card
Figure 4-1
Backplane row jumpers
4-2
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Jumpers
W100
W101
W102
W103
W104
W105
W106
W107
Backplane row jumper removal
Perform the following steps to remove the backplane row
jumpers:
1. If mated together, separate the relay card from the con-
nector card by removing the mounting screw and then
pulling the two cards away from each other. Remember
to only handle the cards by the edges and shields to
avoid contamination.
2. Use Figure 4-1 to locate the jumper(s) to be removed.
3. It is not necessary to physically remove the jumpers
from the PC board. Using a pair of wire cutters, cut one
lead of each jumper.
Backplane row jumper installation
Referring to Figure 4-1 for jumper locations, perform the fol-
lowing steps to install the backplane row jumpers:
1. If mated together, separate the relay card from the con-
nector card by removing the mounting screw and then
pulling the two cards away from each other. Remember
to only handle the cards by the edges and shields to
avoid contamination.
2. Physically remove a cut jumper by unsoldering it from
the PC board.
3. Install a new #22 AWG jumper wire (Keithley P/N J-15)
and solder it to the PC board.
4. Remove the solder flux from the PC board. The cleaning
procedure is explained in Section 6.