This might be a silly question. But, I wanted to know where do I place my measuring devices on my circuit? How do I know that I am measuring what I want to be measured. I know that my negative pin(it's not a pin but it's what I call it) on my oscilloscope (using multisim) should always be grounded because I need to measure against zero. If I measured against anything else with a signal I wouldn't know what the measured signal is. But I'm having problems knowing where on the circuit to place my positive pin.
Is there a rule as to how you know where you need to place your pins in order to get the correct measurement output?
Is there a rule as to how you know where you need to place your pins in order to get the correct measurement output?