How to Accurately Measure Phase Angle in Multisim for Circuit Analysis

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Discussion Overview

The discussion centers on measuring the phase angle of current through a capacitor in Multisim, a circuit simulation software. Participants explore methods for conducting AC analysis and compare results obtained through simulation with manual calculations.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about the possibility of measuring phase angle in Multisim, specifically for the current through a capacitor.
  • A later reply suggests modifying the "AC analysis magnitude" of sources and outlines steps for performing a single frequency AC analysis to obtain phase measurements.
  • Another participant notes that their manual calculation of the phase angle does not match the result obtained from Multisim, indicating a discrepancy in the phase measurement for the current through the capacitor.
  • Further, it is mentioned that the calculated complex current shows a different phase angle than what Multisim provides, leading to questions about the calculation methods used by the software.

Areas of Agreement / Disagreement

Participants express differing views on the accuracy of phase angle measurements in Multisim, with at least one participant confirming their manual results while another highlights a mismatch with the software's output. The discussion remains unresolved regarding the reasons for the discrepancies.

Contextual Notes

Participants have not fully clarified the assumptions behind their calculations or the specific settings used in Multisim, which may affect the results. There is also a lack of consensus on the method of calculating phase angles in the software.

etf
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Hi!
Is it possible to measure phase angle in Multisim? I want to measure phase angle of current through capacitor C1:

sema1.jpg


I got by hand ic1(t)=0.117*sqrt(2)*sin(2*pi*50*t-178.040deg)

Thanks in advance.
 
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Solved...
 
How did you do it?
 
Firstly, it's necessary to modify "AC analysis magnitude" of sources: in my case I put 16.970562 (12sqrt(2)) for voltage source, current source shouldn't be modified. Then I go to Simulate->Analysis->Single frequency AC analysis and there we choose Magnitude/Phase for Complex number format and in Output tab we select our variables. Here are phases for 4 nodes in our circuit:

mjerenje.jpg


It matches with result I got by hand. However, for some reason phase of current through capacitor C1 doesn't match with my result.
 
It doesn't calculate phase angle on same way as I. Here is complex current IC1:
IC1=-0.1174-0.0040195j. Phase angle of this current is atan(-0.0040195/(-0.1174))-pi=-3.1073rad=-178.040deg. Multisim calculates only atan(-0.0040195/(-0.1174))=1.959deg.

mjerenje2.jpg
 
Last edited:

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