Probe error Multisim

Hello

I assigned a circuit AC problem to my students.  They measure the values of voltage and current with amplitude and phase.  It seems that some results are incorrect.  The circuit with results is fixed and the correct answers are below.

I did a similar with the FG and extended measure, and that's okay.

Is = 943<33.61° ma=""                ="">I22nF = 849<59.36° ma            ="">V3k =  1.23<-30.64°>

I3k =  410<-30.64°>

Hello

You use a probe with reference to another probe to calculate the phase at this time. This is a limited feature because it gives only the phase of tension. If you just drop these probes without reference, you will notice:

1. the Irms and VRM is correct in this case.

2. phase won't be shown.

This is due to the fact that the reference sensor calculates a difference. In the case of the current through the 22nf CAP, you will notice that the phase of 30.8. That's because this is the phase of the voltage difference (which is the same for both I22n and I3k) compared to that from the source. This is calculated as referenced probe - probe. If we were to divide using a phase V calculator by the impedance to 22n we would then get the correct current.

The calculation of phase is limited in Multisim functionality.

Kind regards

Tags: NI Software

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