I have a question regarding the use of an Arduino board to measure voltage of a DC-powersupply without sharing grounds. So there should be a galvanic separation between the circuitry of the Arduino and the 48VDC-powersupply. A friend of mine told me to use the LM321 (Voltage to frequency converter, …

Measuring voltage external 48VDC PS, without sharing ground

pwillard March 19, 2013, 5:20pm 4

There are chips designed for dealing with floating power supplies that can provide ISOLATION.

Example:

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