This short video explains the presence of thermal electromotive force (EMF) voltages within reed relays. In applications where very low signal levels are present or very low offset voltages are required, thermal EMF voltages generated across the reed switches can introduce unacceptable errors where accurate measurements are important. Understanding how thermal EMF voltages are generated, what affects the amplitude and the best way to use reed relays where this is critical, will help the user to select the best relay for their application.
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