Yes, R_M should be large relative to the equivalent resistance between the two points in the circuit where you are measuring the voltage. One way to guarantee this is to make R_M large relative to any resistance in the circuit.
Do the math please!!!!!!!!!!!!!!!!!!!!!! That is the only reason I have been stuck on this for this long. WHYY does 1M Reistor with 1M impedance voltmeter lead to .5M reading????????
For our simple model, the input impedance is the resistor R_M between the two terminals on the meter.
Yes, R_M should be large relative to the equivalent resistance between the two points in the circuit where you are measuring the voltage. One way to guarantee this is to make R_M large relative to any resistance in the circuit.
What is input impedance? Around 2:50, I didnt really understand what you meant.
So the point is that R-subM has to be really high to get an accurate measurement?
Thanks, dude! helped a lot.
Do the math please!!!!!!!!!!!!!!!!!!!!!! That is the only reason I have been stuck on this for this long. WHYY does 1M Reistor with 1M impedance voltmeter lead to .5M reading????????
Their multiplication over their sum. This is how you parallel resistors. Very basic that you should be aware of.
My mind has exploded from confusion about meter loading -.-