Mains voltage logger could do with more resolution

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treez

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Hi,
We have done the attached mains voltage logger.
It works but the range of vout is small for 180vac to 265vac.
Do you have approximately-just-as-cheap optimisations for this?

Schem and LTspice sim attached.
 

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  • InAmp Mains voltage logger.pdf
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Is your setup an expanded-scale meter? It's made by installing a zener diode inline with the voltage you're measuring. Select a value so 180V yields a reading just above the zeroline. Then condense your scale so 265V reads at the maximum your setup can handle.

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If you first divide down the initial voltage, so it's in the realm of a few volts, then a plain diode is sufficient to create the expanded scale meter. (Or led, or a string of diodes, etc.)
 
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