User`s guide

306
Chapter 7 Tutorial
Actuators and General-Purpose Switching
Actuators and General-Purpose Switching
The 34903A Actuator provides 20 independent, isolated SPDT
(single-pole, double-throw) or Form C switches. This module offers
simple on-off switching which you can use to control power devices or for
custom switching applications. For example, you can use an actuator to
build a simple resistance ladder as shown below.
In the above diagram, the resistance is 60 when all of the actuator
channels are open (not connected to COM). Note that when the actuator
channels are open, as shown above, the normally-closed contacts
(not shown above) are connected to COM. Values from 10 to 50 are
selected by closing the appropriate channel(s) on the module.
COM
COM
COM
COM
COM
NO
NO
NO
NO
NO
Actuator
Resistance Out
NO = Normally Open
10
10
10
10
10
10
34970A Refresh UG.book Page 306 Wednesday, February 17, 2010 12:34 PM