#314 How to probe a current inside a subckt

[Carsten B Rasmussen]

I would like to know how to probe a current inside subckt. I can not find an example of that in the manual.

Ex.
.subckt test a b
VR1 a c 0
R1 c b 10
.ends

XR1 ax 0
V1 ax 0 1

.control
save @XR1.R1[i] all
dc v1 0 5 0.1

plot @XR1.R1[i] <-- Does not work
plot i(XR1.VR1) <-- Does not work

.endc

.end

I don't know what else to try.
Note. I work with voltages but not currents?

Could somebody please guide me
Thank you.

[marcel hendrix]

Use the "listing e" command to see how to reference.
The below example works.

The .save command has a problem with "@" that I don't
understand right now, or maybe it has to do with the
DC command.

-marcel

~~~~
::html

Example probing

.subckt test a b
VR1 a c dc=1.234
R1 c b 10
.ends test

XR1 ax 0 test
V1 ax 0 dc=1

.save @r.xr1.r1[i] all

.control
listing e
dc v1 0 5 0.1
plot v(xr1.c)
plot @r.xr1.r1[i]
.endc

.end

[Carsten B Rasmussen]

Hej Marcel.
Thank you for clarifying this.

So as I understand from you the syntax for device probing is.

@<device letter="">.<subckt>. ..<devicename></devicename></subckt></device>

Correct!

Thanks

marcel hendrix wrote:

Use the "listing e" command to see how to reference.
The below example works.

The .save command has a problem with "@" that I don't
understand right now, or maybe it has to do with the
DC command.

-marcel

~~~~
::html

Example probing

.subckt test a b
VR1 a c dc=1.234
R1 c b 10
.ends test

XR1 ax 0 test
V1 ax 0 dc=1

.control
listing e
dc v1 0 5 0.1
plot v(xr1.c)
plot @r.xr1.r1[i]
.endc

.end

---

** [bugs:#314] How to probe a current inside a subckt**

Status: open
Group: v1.0 (example)
Created: Tue Sep 22, 2015 10:29 PM UTC by Carsten B Rasmussen
Last Updated: Tue Sep 22, 2015 10:29 PM UTC
Owner: nobody

I would like to know how to probe a current inside subckt. I can not find an example of that in the manual.

Ex.
.subckt test a b
VR1 a c 0
R1 c b 10
.ends

XR1 ax 0
V1 ax 0 1

.control
save @XR1.R1[i] all
dc v1 0 5 0.1

plot @XR1.R1[i] <-- Does not work
plot i(XR1.VR1) <-- Does not work

.endc

.end

I don't know what else to try.
Note. I work with voltages but not currents?

Could somebody please guide me
Thank you.

---

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--

Yours sincerely

Carsten Bleser Rasmussen
Technical Director - R & D

---

Polaric
Jernholmen 54B
DK-2650 Copenhagen SV
Denmark
(tlf) (+45)70225579
(mob) (+45)42720739
http://www.polaric.dk

---

[marcel hendrix]

In principle: yes.

My example lacked a .save command for the resistor current. I have corrected that now by editting the answer. The plots should now be what you intended.

Your question is not a bug and is better put on the ngspice-user forum.

-marcel