Table of Contents
Advertisement
Operation
2.5.5 Mainframe matrix expansion
Model 707
Systems containing up to 30 matrix cards can be built by
daisy-chaining five Model 707 switching matrices together.
Using 30 Model 7077 matrix cards provides 2880
crosspoints.
Assuming all backplane jumpers are installed, connecting
the rows of a card in one mainframe to the rows of a card in
a second mainframe increases the number of columns in the
matrix. For example, if the rows of a 4 × 120 matrix in one
mainframe are connected to the rows of a 4 × 72 matrix in a
second mainframe, the resulting matrix would be 4 × 192.
See the Model 707 Instruction Manual for detailed informa-
tion on daisy-chaining Model 707 mainframes. Table 2-4
summarizes possibilities for mainframe matrix expansion for
one Model 707 Switching Matrix. A maximum of 576 cros-
spoints can be contained in each Model 707 Switching Ma-
trix.
Table 2-4
Mainframe matrix expansion — Model 707
Number of installed
matrix cards per
mainframe
1
2
3
4
5
6
Model 708
Systems containing up to five Model 7077 Matrix Cards are
possible by daisy-chaining five Model 708 Switching Matri-
ces together. Using five Model 7077 Matrix Cards provides
a maximum of 480 crosspoints (96 per switching matrix/ma-
trix card).
The number of columns in the matrix can be increased by
connecting the rows of the card in one switching matrix to
the rows of the card in the second switching matrix, assum-
ing all backplane jumpers are installed. For example, if the
rows of an 8 × 12 card in one switching matrix are connected
to the rows of an 8 × 12 card in a second switching matrix,
the result would be an 8 × 24 matrix. See the Model 708 In-
2-10
Resulting matrix per
Model 707 Switching
Matrix
8 × 12
8 × 24
8 × 36
8 × 48
8 × 60
8 × 72
struction Manual for detailed information on daisy-chaining
Model 708 Switching Matrices. Table 2-5 summarizes the
possibilities for mainframe matrix expansion for the Model
708 Switching Matrix.
Table 2-5
Mainframe matrix expansion — Model 708
Number of mainframe
1
2
3
4
5
2.6
Typical connection schemes
The following paragraphs provide typical connection
schemes for single card, multiple card, and multiple switch-
ing matrix configurations. A system using the matrix card
with a multiplexer card (Keithley Model 7075) is illustrated
to demonstrate versatility and compatibility.
All examples show BNC cables. In many cases, these cables
are best used by cutting them in half, which provides twice
as many cables and allows direct connection to instrumenta-
tion and the DUT. Cables could be custom built to better suit
a particular application.
2.6.1 Single card system
External connections for a single card system are made by
connecting instrumentation to matrix card rows using a BNC
cable for general purpose testing. Cutting one of these cables
in half provides two column cables that will connect directly
to the DUT. Figure 2-12 shows the connections of an exam-
ple single card system. Instruments are connected to the
Model 7077 rows, and DUTs are connected to the Model
7077 columns and four of the rows (E through H).
2.6.2 Multiple card system
Figure 2-13 shows a system using two matrix cards. In this
configuration, the instrumentation and the DUT are both
connected to the columns of the matrix. In this example, the
instruments are connected to the rows (they only require six
pathways), and the DUTs are connected to the columns.
Resulting matrix
8 × 12
8 × 24
8 × 36
8 × 48
8 × 60
Advertisement
Table of Contents
Troubleshooting
