Hello,
I wanted to analyse (AC) an R L C chain (serie) with one voltage source. The result were good when measured between an node and ground. Does anyone know how to measure between nodes? Is a common grond really necessary in this case?
problem with AC analysis in SwCadIII
Aug 19, 2006
7 Replies
Right click on the circuit. At the bottom of the pop up menu there is an item 'set probe reference' click that and click on a node in the circuit to set your new reference point.
Or. Left-click on the first node, hold the button down, drag the mouse to the second node, release the button.
Tony Williams.
In message , dated Sat, 19 Aug 2006, Geert writes
There is a mailgroup devoted to SwCAD, and it's better to ask there. But when you click on 'Run' and the panel asks you to choose what to output, double-click and enter Vn(00x)-Vn(00y), with your node references for x and y.
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
2006 is YMMVI- Your mileage may vary immensely.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
"Tony Williams" schrieb im Newsbeitrag news: snipped-for-privacy@ledelec.demon.co.uk...
Hello Tony,
How to do this with cursor and mouse has been already answered by the others.
You can also enter a difference directly in the "Add Trace" dialog. Just enter the following (replace netname1,2 with your nodenames).
V(netname1,netname2)
You could also enter this in the long form, but the previous method is more elegant and shorter. V(netname2)-V(netname2)
You always need at least one GND in your circuit in every SPICE.
A DC-path to GND is necessary from every node. This is important if you simulate isolated circuits. You have to add then a resistor to GND at one point in the isolated section, e.g. 1000GOhm.
Best regards, Helmut
"Helmut Sennewald" schrieb im Newsbeitrag news:ec70sa$t7e$03$ snipped-for-privacy@news.t-online.com...
news: snipped-for-privacy@ledelec.demon.co.uk...
Sorry Tony,
I should have written Geert.
Best regards, Helmut
New glasses (asap) Helmut, please. :)
There is one other method, very useful when the plots have to be shown to others, so a less cryptic syntax is desirable.
Put a x1 VCVS across the two nodes, -output to earth and +output appropriately labelled. In this case the OP could (say) have an output labelled "L1". The plot would then display V[L1]. This is nicely consistent with LTspice's labelling of currents, eg I[L1].
Tony Williams.
news:ec70sa$t7e$03$ snipped-for-privacy@news.t-online.com...
news: snipped-for-privacy@ledelec.demon.co.uk...
Thanks Helmut,
My problem is solved.
Best regards Geert
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