The buzzer is in a pest deterrent, the red light comes on but its totally ignored by passing cats. The sound frequency is not heard by humans so the only thing I can find suspect is the buzzer because it has no resistance across its terminals. I would be very grateful for your guidance, Thanks R Cook.
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I am unsure about your question specifically but this might be able to help: http://electronics.stackexchange.com/questions/103845/how-to-tell-a-piezo-buzzer-is-broken – Zaid Al Shattle Mar 24 '17 at 12:14
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By "no resistance" do you mean a SHORT? – Trevor_G Mar 24 '17 at 12:21
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Also, that "buzzer" looks like it needs a signal not just a voltage. Are you driving it that way? – Trevor_G Mar 24 '17 at 12:26
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The AT3840 is a passive piezoelectric transducer it needs to be driven by a signal at its resonant frequency. A DC measurement across its terminals will show an open circuit.
RoyC
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