problem with AC analysis in SwCadIII

[Geert]

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?

 

[Genome]

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?

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.

 

[Tony Williams]

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.

 

[John Woodgate]

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?

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.

 

[Helmut Sennewald]

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.

Or. Left-click on the first node, hold the button down,
drag the mouse to the second node, release the button.

Best regards,
Helmut

 

[Helmut Sennewald]

Hello Tony,

Sorry Tony,

I should have written Geert.

Best regards,
Helmut

 

[Tony Williams]

Hello Tony,

New glasses (asap) Helmut, please.

You could also enter this in the long form, but the previous
method is more elegant and shorter.
V(netname2)-V(netname2)

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].

 

[Geert]

Helmut Sennewald schreef:

Sorry Tony,

I should have written Geert.

Thanks Helmut,

My problem is solved.

Best regards
Geert