multisim

[Priyatham24]

I am working on a circuit to study the effects of load on the source side and study the harmonics present in the circuit due to the load. I worked on it but I need a Fourier analysis of input current waveform in order to study the harmonics. I am attaching the pictures of the two models I am working on and i need help in getting the Fourier analysis of the wave at the current probe at 230 v input signal.I am getting an error as :LENGTHS DO NOT MATCH the Fourier analysis i am attaching is for inductive load. I am expecting a solution at the earliest

[jcham]

I recreated your circuit and was able to run Fourier analysis with no issue. What version of Multisim are you using? Are you running Fourier analysis with default settings? 

Could you attach your circuit so we can take a closer look?

Thanks,

Jeff 

National Instruments

[Priyatham24]

I am using multisim version 11.0 and I tried to simulate the circuit by setting the parameters to default.but still i face the same problem.

[jcham]

Hi Priyatham24, 

Could you attach your ms11 file so we can take a closer look? 

Thanks,

Jeff

National Instruments

[Priyatham24]

I am attaching ms 11 file here.but can you be quick in analysing the simulation, because i have got some deadlines, so i request you to make it quick. thanking you in advance.

[jcham · Accepted solution]

This was caused by an legacy issue with our internal simulation engine with the syntax used in some device parameters - in this case the square brackets used in the current expression in your output variable. 

This was fixed and works correctly in Multisim 13 and later versions. 

If Multisim 13 is not an option for you, you can get the analysis to work in Multisim 11 by removing the current output variable in the Output tab of the Fourier Analysis settings, selecting "All variables" from the dropdown in the left-hand variables list, and adding the "I(h1:xcp1)" variable to the analysis. This is the same variable, just with a different syntax, and will not cause any issues when running the simulation. 

I hope that helps.

Jeff

National Instruments

[Priyatham24]

thank you ..it worked

[Priyatham24]

why dont someone help me regarding using smps in multisim. I have already posted in the forum regarding this but none replied.can you help me regarding this.for more, check my post on smps with flyback as subject