Operation
2-6
Use the following procedure to connect a BNC cable to the
matrix card:
1. Install the matrix card in the Model 707 or 708 Switch-
ing Matrix (see paragraph 4.3).
2. Push the cables onto the appropriate receptacle of the
matrix card.
3. Tighten the BNC connector to secure it to the panel. The
same procedure can be used for connecting the cable
plug to a test fixture receptacle.
Modifying BNC terminated
A common way to use the standard cable is to cut it at a con-
venient length. The result is two cables that are both unter-
minated at one end. The unterminated ends of the cables can
then be connected to instrumentation and the DUT, and the
other ends can mate to the ROW and COLUMN BNC con-
nectors of the matrix card.
WARNING
Due to the large amount of wiring that
switching systems contain, check that
both ends of the coaxial cable to be cut
are disconnected from instruments or
DUTs prior to performing this proce-
dure. Cutting a connected cable may
cause severe injury or death due to elec-
tric shock.
2.5
Matrix expansion
By using additional matrix cards in the Model 707 or addi-
tional switching matrices in the Model 708, larger matrices
can be configured through the backplane of the Model 707 or
708. Therefore, unless otherwise noted, the examples pro-
vided in the following paragraphs assume the Model 7077
backplane jumpers are installed.
2.5.1 Backplane row jumpers
Matrix row expansion can be done through the backplane of
the Model 707 or 708 Switching Matrix. As explained in
paragraph 2.2, the Model 7077 has eight sets of backplane
jumpers that connect the rows of the matrix card to the
switching matrix backplane.
Model 707 switching matrix
The set of backplane jumpers located in the Model 707
Switching Matrix must be considered when building larger
matrices through rows. With the switching matrix backplane
jumpers installed, the rows of all switching matrix slots are
connected together. With these jumpers removed, the rows of
Model 707 Switching Matrix slots 1, 2, and 3 are isolated
from the rows of slots 4, 5, and 6.
Table 2-2
Available Keithley cables and connectors
Model or part
number
Description
237-ALG-2
4801
4802-10
4803
4804
4851
6147
7051-2 BNC to
BNC cable
7051-5 BNC to
BNC cable
7051-10 BNC to
BNC cable
7754-3 BNC to alli-
gator cable
7755 50
Ω
feed-
through terminator
Low noise triax cable 2m (6.6ft.) in
length with a 3-slot male triax con-
nector on one end and three alligator
clips on the other.
Low noise coaxial cable 1.2m
(48in.) in length with male BNC
connectors on both ends.
Low noise coaxial cable 3m (10ft.)
in length with a male BNC connec-
tor at one end and unterminated at
the other end.
Low noise cable kit. Includes 50ft.
of low noise coaxial cable, 10 male
BNC connectors, and 5 female BNC
chassis-mount connectors.
Male BNC to female triax adapter.
BNC shorting plug.
Male triax to female BNC adapter.
The Model 7051-2 is a 50
Ω
BNC to
BNC cable (RG-58C) 1.5m (5ft.) in
length.
The Model 7051-5 is a 50
Ω
BNC to
BNC cable (RG-58C) 1.5m (5ft.) in
length.
The Model 7051-10 is a 50
Ω
BNC
to BNC cable (RG-58C) 3.0m
(10ft.) in length.
The Model 7754-3 is a 0.9m (3ft.)
50
Ω
cable (RG-58C) terminated
with a BNC plug on one end and
two alligator clips on the other end.
The Model 7755 is a BNC to BNC
adapter terminated with a 50
Ω
resis-
tor.
Содержание 7077
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