Hello, I have a question about what may be causing some weird readings on my DMM. It's not a fancy unit, I purchased it from NAPA for around $100.00 it does however have a multitude of functions AC/DC current, Pulse Width, Frequency, Diode/Cap check etc... The issue that I'm having is when I run this electromagnetic contraption that's been made, if the multimeter is near the device (while running) and set to the ohms position (multimeter leads not touching anything) instead of sitting there at OL it will start reading high resistances. If the multimeter is set to the AC or DC volts position when the device operates the multimeter acts like it is being used beyond its normal voltage rating, every word, symbol and indicator light on the DMM will illuminate..this happens with other multimeters I have as well.
Is it possible in the presence of a strong electromagnetic field, if the device that is causing all of this is putting out frequencies in the RF range, could the internal zener diodes in the DMM be "triggering" sort of acting like PIN Diode Geiger? Detecting RF frequency? Only thing I can think of that would be causing something to happen like that.
Is it possible in the presence of a strong electromagnetic field, if the device that is causing all of this is putting out frequencies in the RF range, could the internal zener diodes in the DMM be "triggering" sort of acting like PIN Diode Geiger? Detecting RF frequency? Only thing I can think of that would be causing something to happen like that.