In this section:
Introduction to the Model 3720 dual 1x30 multiplexer card ...... 4-1
Available accessories: Model 3720 .......................................... 4-2
Connection information: Model 3720........................................ 4-2
Schematics: Model 3720 .......................................................... 4-3
Introduction to the Model 3720 dual 1x30 multiplexer card
The Model 3720 offers two independent banks of 1×30 two-pole multiplexers (see next figure). It is
ideal for general-purpose switching, including temperature measurements. The two banks can
automatically be connected to the Series 3700A 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 3: Model 3720
Section 4
Model 3720 multiplexer card