Hello everyone,
I'm encountering an issue while using an oscilloscope. When I connect the probe tip and ground across a resistor, everything seems fine. However, when I place multimeter leads across the same resistor simultaneously, my oscilloscope begins to pick up a 100 Hz noise, which I suspect is related to mains interference.
Interestingly, I've noticed that the amplitude of this noise increases with the value of the resistor. I initially thought that according to Faraday's Law of electromagnetic induction, the noise level should remain constant since the loop area created by the oscilloscope's probe and ground lead remains unchanged.
Could someone help clarify why the noise amplitude increases with resistor value? Is there another principle at play here that I might be overlooking? Thanks in advance!