Model 3720 Dual 1X30 Multiplexer Card; Available Accessories: Model 3720 - Keithley 3720 User Manual

Section 9: Series 3700 Module Schematics and Connections

Model 3720 dual 1x30 multiplexer card

The Model 3720 offers two independent banks of 1×30 two-pole multiplexers. It is ideal for
general-purpose switching, including temperature measurements. The two banks can
automatically be connected to the Series 3700 mainframe backplane and optional DMM through
the analog backplane connection relays. This connection allows the mainframe to reconfigure
the card to a single 1×60 two-pole multiplexer or to enable card-to-card expansion for even
larger configurations.
Other features of the Model 3720 include its ability to be reconfigured to coordinated four-pole
operation for additional measurement flexibility. Furthermore, the Model 3720 supports
thermocouple-type temperature measurements with the Model 3720-ST (screw terminal)
accessory providing automatic cold junction compensation (CJC).
The Model 3720 uses two 78-pin male D-sub connectors for signal connections. For screw
terminal or automatic CJC, use the detachable Model 3720-ST accessory.
Figure 9-1: Model 3720

Available accessories: Model 3720

3720-MTC-1.5:
3720-MTC-3:
3720-ST:
3791-KIT78-R:
7401:
9-8
78-pin female-to-male D-sub cable assembly, 1.5m (4.9ft)
78-pin female-to-male D-sub cable assembly, 3m (9.8ft)
Screw Terminal panel with CJC sensor
78-pin female D-sub connector kit (solder cup contacts). See
Model 3720 (on page 9-9).
Type K thermocouple wire kit
Series 3700 System Switch/Multimeter User's Manual
Connection information:
Document Number: 3700S-900-01 Rev. A / August 2007