RLC, Single frequency AC analysis results do not match hand caculated results.

[MAGNOTRAN]

My hand calculated results:

For this example, I get:

Z = 400 – j300

Z, mag = 500, phase = -36.86

I, mag = 0.04, phase = 36.86

VR, mag = 16 , phase = 36.86

VL, mag = 52, phase = 126.86

VC, mag = 64, phase = -53.14

The Multisim magnitude values are all off by factor of 20 (You have to multiply  Multisim magnitude results by 20 to get the correct results) Multisim and hand calculated Phase values are all correct and match. These hand calculated values are correct since phasor magnitude sum of  the individual component voltages equal the source (sqrt( R ^ 2 + (VC – VL ) ^ 2) = 20) but Multisim magnitude results do not. The original Multisim file (attached)has a DC source with 0 voltage magnitude (author used for current calculation that is redundant) in series with the capacitor that has been removed for simplicity.

Tien P,

Were you able to confirm Multisim results and do you have any status?

Thank you in advance.

[Tien_P]

To get the correct reading, double-click on the source V1 and in the AC Analysis Magnitude set your voltage to 20V.  When you run the AC or Single Point Analysis, the value in this field is used; the Voltage(pk)  field is only used in the time domain such as Transient analysis.  I know this is confusing but this is part of SPICE.  

[MAGNOTRAN · Accepted solution]

Tien,

Thanks very much for your assistance. I posted Kudos. If you did not receive it, please send me the link and I will post again.

[MAGNOTRAN]

I posted Kudos but it does not appear that it has been posted. I suppose I may have filled in the wrong information since I had to guess a few thing like AE country, etc. This link/page should be improved for seamsless posting of kudos.