hey guys, so here is my problem, should be fairly simple but my intelligence is on a strike, could be yesterdays beer.
the idea is to find impedance Z.i am using the 500ohm series resistor to find the current I flowing through the circuit(by messuiring V2). now in the path to measure V1 (across Z) there is a 80 ohm resistance which would obviously bias the value V1 across Z and give me the wrong V1, hence a wrong estimate of Z. how do i compensate for this 80ohm resistence in the measurement path??
If you measure V1 with a DVM, this will have a 10 megohm input impedance so the extra current, will be very low, and as you know its a 10 megohm resistor you can compensate for it in your calculations.
Frank
the voltage measuring setup across Z has a input impedance of 1Gohms. So am i right in assuming there is essentially no current flowing through the 80ohm resistor as sunnyskyguy said and the measured voltage V1 across Z would approximately be the same with and witout the 80ohm in the voltage measurement path?? thanks