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Using CRO to analyse circuit

Discussion in 'Homework Help' started by wheeltiger, Mar 19, 2007.

  1. wheeltiger

    Thread Starter New Member

    Mar 19, 2007
    6
    0
    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:
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,073
    8
    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.
     
  3. wheeltiger

    Thread Starter New Member

    Mar 19, 2007
    6
    0
    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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