NI Switch Cards to Measure Capacitive/Inductive Loads

Updated Sep 27, 2018

Issue Details

I will use NI Switch and NI DMM cards to measure inductive and capacitive loads. What do I have to consider when selecting a switch card?

Solution

To select the right switching card consider the following:

 

  1. Avoid using reed relays. As is explained in section 6, Switching Inductive Loads, of Switching Considerations, inrush currents may weld the reed contact.
  2. As is explain in Protecting NI Switch Modules When Switching Inductive Loads, you have to use flyback diodes or MOVs to limit the flyback voltage.

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