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Suppressed zero meter

2017-08-17 20:43  
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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

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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