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OPERATION
2.5.2 Direct Connections
With this method, connections
are made directly to quick-
disconnect terminal
blocks. The "rack and panel" recep-
tacles are not used. Additional
terminal blocks are available
from Keithley
(see Table Z-2).
NOTE
For optimum performance, use a low noise, shield-
ed cable that has excellent insulation
qualitites
such as Teflon@ or polystyrene).
Perform the following
steps to wire the matrix card:
1. Perform one of the following
procedures
(A or B):
A. If leaving the terminal blocks connected to the recep-
tacles, carefully
pull
the
appropriate
blocks off the
matrix
PC board.
lie
wrap
or tape the loose
assemblies together and position
them out of the
Way.
B. If using the supplied terminal blocks, disconnect the
receptacle wires from the ones you are going to use
and carefully
pull them off the PC board. lie wrap
or tape the loose receptacle wires together and posi-
tion them out of the way.
NOTE
Receptacle wires are tagged for identification.
Red
wires are HI terminals,
black wires are LO, and
white wires are GUARD. Contact identification
at
the receptacles is provided
in Figure 2-10.
2.
Using a screwdriver, connect the circuitry to the terminal
blocks. Figure 2-12 shows how a triaxial cable may be
connected. The screw terminals
accept up to $16 AWG
wire.
3. The terminal blocks should be connected to the matrix
cm? during installation
of the card into the mainframe.
The procedure to do this is contained in paragraph 2.3.
w
Triaxial Cable
Figure 2-12. Termlnal Block Connections
2.5.3 Connections
Using Connector
Kit
(Model 7078-KIT)
The Model 7U78XlT contains the parts of one "rack and
panel" plug. This kit allows the user to build a cable that
will mate to the "rack and panel" receptacles of the matrix
card.
NOTE
The following
procedure
shows how to properly
connect a 36 conductor cable to a "rack
and
panel"
plug. The cable used in the procedure is the same
one used in the Model iQ78-MTC and is available
from Belden (P/N 9734). Modify the procedure ac-
cordingly
if using a
different
cable or individual
wires and use Figure 2-23 instead of Figure 2-14.
Perform the following
steps to connect the 36
conductor
Belden cable to the Model 7W78XIT plug:
Feed one end of the cable through
the
plug hous-
ing. Slide the housing
far enough down the
cable to
set it out of the way.
2-15
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