Led Simulation error

I had problems with a more complex circuit that I played with, and I've narrowed the problem down to handling of Multisim diodes during the simulation.

The circuit below shows two branches that have identical resistances but there is a diode in series with it if she performs only other each half cycle. It is a rectifier and theory tells us to wait for the RMS current through resistance to 70.7% of the current flowing through a resistance that does not have the diode in series (for an ideal diode). For R2 below I (R2) = 12/2.88 = 4 .16A and this is properly determined by XMM2 multimeter. The current in the branch of the diode must be 4.16 * 0.707 = 2.94 A but as you can see XMM1 multimeter is far away. I changed the led a virtual model and the current has dropped to 2.14 A...

I checked this with the same values of resistance and the diode model using LTSpice and I get the correct results with this program (which allows Fior diode charactersists)...

I have attached two files (Multisim 14 and LTSpice) simulaiton for reference.

So what is happening here?

Hi Myamigo

Thanks for that information, I think that the issue here is with the multimeter and not with the circuit. I used a current probe and got A 2.8 on this line. I enclose a picture showing this.

I think that this may be due to a configuration on this unit or it can also be a CAR, but I need to conduct additional research on this to see if it is a wrongful conduct of Multisim multimeter.

Tags: NI Software

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