![]() ![]() ![]() I mesured a voltage between the ground of RPi and the earth about 85VAC, of course it's normal because the RPi is floating. I used a fluke multimeters (for electronics : Fluke 87V). You are measuring the same effect with your Pi. Try touching an oscilloscope probe with your finger you will measure tens of volts of mains hum. The result is that you pick up stray signals on any high-impedance input. Those signals go through the electronics asymmetrically, because that's what non-linear components do. (Unlikely given there will be leakage, but theoretically possible.) All the wires to your Analogue board will be aerials picking up mains hum. ![]() It could have any voltage on it up to thousands of volts. Your entire Pi system is floating relative to Earth. Rurwin wrote:How do you know you have an AC voltage? Oscilloscopes are invariably earthed unless running entirely on battery power.
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