Using CRO to analyse circuit

Thread Starter

wheeltiger

Joined Mar 19, 2007
6
I have built up this circuit as in the attached image, and I measured the peak-peak voltage for open circuit and closed circuit using CRO.

I need to calculate Rm.
I have worked out that Rm = (VRs)/(e-V).

But I don't know how to get 'e' and 'V'... :confused:
 

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thingmaker3

Joined May 16, 2005
5,084
You've already got them. :) Sigma is the source voltage which you measued with the switch closed, and V is the voltage across Rm which you measured with the switch open.
 

Thread Starter

wheeltiger

Joined Mar 19, 2007
6
Thanks a lot!:) :)

I have one more question...:p
For the circuit in the attachment, how do I verify that the expected value of the resistance in the signal generator (Rth) must be small compared with the expected impedances of Cext and C1 ?:confused:
 

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