0
\$\begingroup\$

I am a beginner and trying to simulate a cole-cole plot of a simple parallel circuit having two R, one coil and a capacitor. Image attaced, LTspice version is XVII, pc is windows7.

I've read this Q-A;[Bode plot graph: Frequency vs. Angular frequency] Bode plot graph: Frequency vs. Angular frequency but things does not seem to be the same.

When I checked out the current for R1, the graph goes well. So altered this curve from R2 to 1V/I(R2) as shown in this image in the upper left.

Then altered the vertical values; 85dB to -85dB, with the tick 5db, and clicked Nyquist. This seems works goo.

But when I alter the horizontal value; o.oohms - 1Mohms, the curve collapses.

Any tips will be very much appreciated, thanks!

p.s.; Incidentally I tried turned off [Autoranging], but the results was the same...

enter image description here

Improve this question
\$\endgroup\$
2
  • \$\begingroup\$ As I understand it , Cole-Cole plots are for phaser dielectric properties in the microwave band to establish a model from data, not discrete parts <1Hz ameteksi.com/products/software/zsimpwin \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Aug 15 '18 at 3:02
  • 1
    \$\begingroup\$ Welcome to EE.SE. Can you ask a specific answarable question? \$\endgroup\$ – winny Aug 15 '18 at 6:50
1
\$\begingroup\$

LTspice doesn't have ohms, farads, etc, in the schematic editor, all it has is units, and they are case insensitive. That is, m stands for milli (1e-3), and so does M. So what you have is a step from 1 to 1e-3. So do not bother adding ohm, it has no effect, you can just write .ac oct 50 1 1meg.

Also, LTspiceXVII orders the stepped values in increasing order, but I don't know if this also applies to .AC directives.

Improve this answer
\$\endgroup\$
3
  • \$\begingroup\$ Hello Concerned_Citisen, thanks. your tip was fantastic to me. I did this. \$\endgroup\$ – Chy Farm Aug 15 '18 at 14:09
  • \$\begingroup\$ @ChyFarm If you think the answer was helpful, mark it as answered by clicking on it (the select mark below the down-arrow). This will serve others, in the future, to know that the answer can be used for their problems, as well. \$\endgroup\$ – a concerned citizen Aug 15 '18 at 20:12
  • \$\begingroup\$ Concerned_Citizen, thanks again, was looking for that mark! Now did it. \$\endgroup\$ – Chy Farm Aug 16 '18 at 1:06

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.