The Actuator / General-Purpose Switch
You can think of the HP 34903A Actuator as a control output because it
is often used to control external power devices. The actuator provides
20 independent, isolated Form C (
SPDT) switches.
Each channel can switch up to 300V dc or ac rms. Each switch can also
switch up to 1 A dc or ac rms up to 50 W maximum. For example, the
maximum current that you can switch at 120 V is 0.45 A as shown below.
For control applications, the actuator has the following advantages:
• Higher voltage and power rating than the digital output channels.
The actuator switches can also be used to control power devices.
• When used with high-power devices, however, it is critical that you
provide protection to the switch from capacitive and inductive loads
to ensure maximum relay life (for more information on attenuators,
see the discussion on page 387).
NC
COM
NO
NC
COM
Channel Open
(NC Contact Connected)
Channel Closed
(NO Contact Connected)
NO
NO = Normally Open
NC = Normally Closed
Voltage
Current
3
Chapter 3 System Overview
Control Output
69
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