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Data logging devices are commonplace now days. Many high-end multimeters have such a feature where you can plug the meter up to a power source and record levels over time.

But I'm interested in recording out-of-bounds events such as spikes and sags in mains supply.

This type of measurement is typically only found in power systems analyzers which are quite "$pendy".

Anybody know of an event logger that is affordable?

THanks,
Dave

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