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RLC phase angle - Multisim

  1. Apr 24, 2015 #1


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    1. The problem statement, all variables and given/known data
    This is actually a lab I'm performing on Multisim. I've recreated a circuit that I build in lab class , but I'm not getting the output I need. I am trying to calculate the V and phase angle across each component. I already have the measurements found form the class lab. In addition to the oscilloscope terminal B not working, I'm not sure how to calculate the phase angle across the cap and inductor.

    I know that each angle is -90 for cap and +90 for inductor.
    2. Relevant equations
    See images RLC.png RLC phase angle.png

    3. The attempt at a solution

    Measured values, but not sure how to apply to phase angle equation to find capacitor and inductor phase angles.
  2. jcsd
  3. Apr 24, 2015 #2


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    Nevermind the multisim question, I figured out what I was doing wrong. As far as calculating the phase angles: do I measure the distance between the source wave and the component wave (wave/division) then take the tan-1(dV/R)?
  4. Apr 24, 2015 #3


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    Homework Helper

    The equation you have been given is for the phase of the entire circuit.

    I'm not sure, but you may be looking for a "phase difference". In that case ##\phi = \omega \Delta T = 2 \pi f \Delta T## should be all you need.
  5. Apr 24, 2015 #4


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    My second port is no longer flat-lining, and I know I have to move the placement of the resistor in the circuit in order to get a reading of it on the oscilliscope, but the scope doesn't match my Vr measurement from lab, instead its looks closer to what I got for the Vcap measure. Could someone please explain this to me?

    Attached Files:

    • rlc1.png
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    Last edited: Apr 24, 2015
  6. Apr 24, 2015 #5


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    Staff: Mentor

    You have B monitoring the capacitor voltage (between the capacitor and earth), and the display shows this voltage lagging the signal voltage.
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