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2-22
Dual multiplexer application
This application demonstrates how to use the Model 7702 as a dual multiplexer to bias and
measure 20 DUT. An external source powers DUT, while the DMM of the Model 2790
measures the output of the DUT. To prevent overloading of the external source, each DUT
is powered (and measured) separately.
Figure 2-9
the Sense terminals of the switching module, and DUT is connected to channels 1 through
20. Channels 21 through 40 are used to connect external power to each DUT.
For this application, the 2-pole/4-pole relay and backplane isolation relays of the switching
module are to be controlled as follows:
•
•
•
In
Figure
for DUT 1 is shown in
ferent source and measure channels are closed. Closed channels for each DUT test are
listed as follows:
shows the connections for this application. The external source is connected to
Closing channel 43 isolates the input measurement channels (1 through 20) from the
external source channels (21 through 40). It also connects the DUT to the external
source. This channel must remain closed while testing DUT.
Opening channel 44 isolates the external source from the backplane of the
Model 2790. This channel must remain open while testing DUT.
Closing channel 45 connects an input channel (1 through 20) to the DMM.
2-9, channels 1 and 21 are closed to test DUT 1. A more detailed view of the test
Figure
Tested
device
Closed channels
DUT 1
1, 21, 43, and 45
DUT 2
2, 22, 43, and 45
DUT 3
3, 23, 43, and 45
DUT 4
4, 24, 43, and 45
DUT 5
5, 25, 43, and 45
DUT 6
6, 26, 43, and 45
DUT 7
7, 27, 43, and 45
DUT 8
8, 28, 43, and 45
DUT 9
9, 29, 43, and 45
DUT 10
10, 30, 43, and 45
Model 2790 SourceMeter
2-10. The test for the other DUTs is similar except that dif-
Tested
device
DUT 11
DUT 12
DUT 13
DUT 14
DUT 15
DUT 16
DUT 17
DUT 18
DUT 19
DUT 20
®
Switch System Reference Manual
Closed channels
11, 31, 43, and 45
12, 32, 43, and 45
13, 33, 43, and 45
14, 34, 43, and 45
15, 35, 43, and 45
16, 36, 43, and 45
17, 37, 43, and 45
18, 38, 43, and 45
19, 39, 43, and 45
20, 40, 43, and 45
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