Keithley 7709, Руководство пользователя

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6
Matrix expansion
Basic matrix column expansion
The number of columns in a matrix test system can be increased by simply installing another Model 7709 in the mainframe.
For the Model 2700/2701 mainframe, adding a second Model 7709 increases the total number of columns to 16. For the
Model 2750, five installed Model 7709s provide 40 columns for DUT.
Figure 5 shows a two matrix module system to test 16 DUT. It is similar to the one in Figure 2 except that the second card
allows eight more DUT to be tested. As shown, system channel 3 of the second module is closed to connect DUT 11 to the
DMM Input.
Figure 5
Two matrix module test system
Figure 6 shows a two matrix module system that uses an external source. It is similar to the one in Figure 4 except that it allows
more DUT to be tested. The first matrix module is used to route the external source to the DUT, while the second module is
used to measure the DUT.
As shown in Figure 6 , DUT 1 is tested by closing multiple channel 25 and system channel 1 of the two respective modules.
The other DUT is tested in a similar manner. DUT 2 is tested with channels 26 and 2 closed, DUT 3 is tested with channels 27
and 3 closed, and so on.
1
8
7709
#1
DMM
Input
DUT
8
DUT
7
DUT
6
DUT
5
DUT
4
DUT
1
DUT
2
DUT
3
8 7 6 5 4 3 2 1
System channel 3 of module #2 closed to connect DUT 11 to DMM Input.
Note: Each signal path shown in this illustration is actually a two conductor
path pair (HI and LO).
1
8
7709
#2
DMM
Input
DUT
16
DUT
15
DUT
14
DUT
13
DUT
12
DUT
9
DUT
10
DUT
11
8
7 6 5 4 3 2 1
1
6
1
6