2-26 Close/Open Switching Module Channels Model 2701 User’s Manual
Dual multiplexer application
This application demonstrates how to use the Model 7700 as a dual multiplexer to bias and
measure 10 DUT. An external source powers DUT, while the DMM of the Model 2701
measures the output of the DUT. To prevent overloading of the external source, each DUT
is powered (and measured) separately.
Figure 2-9 shows the connections for this application. The external source is connected to
the Sense terminals of the switching module and DUT is connected to channels 1 through
10. Channels 11 through 20 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:
• Closing channel 23 connects the External Source to DUT via channels 11 through
20. Closing channel 23 also isolates measure channels (1 through 10) from the
source channels (11 through 20). This channel must remain closed while testing
DUT.
• Opening channel 24 isolates the external source from the backplane of the
Model 2701. This channel must remain open while testing DUT.
• Closing channel 25 connects an input channel (1 through 10) to the DMM.
In Figure 2-9, channels 1 and 11 are closed to test DUT 1. A more detailed view of the test
for DUT 1 is shown in Figure 2-10. The test for the other DUTs is similar except that
different source and measure channels are closed. Closed channels for each DUT test are
listed as follows:
NOTE Do not use this application to measure the temperature of DUT using a
thermocouple with the INTernal or EXTernal reference junction selected. The
SIMulated reference junction will instead be used resulting in invalid readings.
The “ERR” annunciator will turn on to indicate that the integrity of the
temperature reading is questionable.
Tested
device Closed channels
Tested
device Closed channels
DUT 1 1, 11, 23, and 25 DUT 6 6, 16, 23, and 25
DUT 2 2, 12, 23, and 25 DUT 7 7, 17, 23, and 25
DUT 3 3, 13, 23, and 25 DUT 8 8, 18, 23, and 25
DUT 4 4, 14, 23, and 25 DUT 9 9, 19, 23, and 25
DUT 5 5, 15, 23, and 25 DUT 10 10, 20, 23, and 25
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