Idiomas disponibles
Idiomas disponibles
4 Measurement Tutorials
Actuators and General-Purpose Switching
The DAQM903A 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 Ω 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 Ω to 50 Ω are selected by closing the appropriate channel(s) on the module.
Snubber circuits
Whenever a relay contact opens or closes, electrical breakdown or arching can occur between the contacts. This
can cause high-frequency noise radiation, voltage and current surges, and physical damage to the relay contacts.
A breadboard area is provided on the DAQM903A to implement custom circuitry such as simple filters, snubbers,
and voltage dividers. The breadboard area provides the space necessary to insert your own components but there
are no circuit board traces here. You can build these networks to provide contact protection when actuating AC
power line for reactive loads. Although many types of contact protection networks can be used, only RC networks
and varistors are described in this section.
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Keysight DAQ970A/DAQ973A User's Guide
