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Chapter 8 Tutorial
Actuators and General-Purpose Switching
Actuators and General-Purpose Switching
The HP 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.
Actuator
COM
NO
COM
NO
COM
NO
COM
NO
COM
NO
NO = Normally Open
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.
384
Resistance Out
10
10
10
10
10
10
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