Suppressed zero meter

Posted on Jan 10, 2013

A zener diode placed in series with a voltmeter will prevent the meter from reading until the applied voltage exceeds the zener voltage

Suppressed zero meter
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Thus, a 10 volt zener in series with a 5-volt meter will allow the condition of a 12 V car battery to be monitored with much greater sensitivity than would be possible with a meter reading 0-15 volts.

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