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Helmut,

Edit Plot Defs File works when I open LTspice as Administrator in Windows 7. Thanks... but now LTspice is not using the plot.defs file I created.

I edit the file using the Edit Plot Defs File. After making changes to the file, I save, close and reopen the file. The changes are all there but LTspice is not using the file when I Run a simulation. It appears to be using the Autoranging EVERY TIME I Run a simulation, even though I have unchecked Plot Settings\Autorange.

I have looked through the menus to see some master toggle for Autoranging feature but can't find anything.

I verified that the code in the file actually works copying the file to another name. It runs fine when I use Plot Settings/Open Plot Settings File and the selecting the file.

FYI, the code looks like this:
[Transient Analysis]
{
Npanes: 1
{
traces: 1 {268959746,0,"V(n001)"}
X: ('n',1,0,5e-010,6e-009)
Y[0]: (' ',1,-4,0.2,4)
Y[1]: ('_',0,1e+308,0,-1e+308)
Volts: (' ',0,0,1,-4,0.2,4)
Log: 0 0 0
GridStyle: 1
}
}





Thank you for your expertise!
Al

--- In LTspice@..., "Al" <alhastings314@...> wrote:

I'm using LTspice version 4.19i and can not get "Edit Plot Defs File" to work. I don't know if this feature existed or worked on earlier versions or not.

After I Run a simulation, I click on the .raw window to activate the window. Click "Plot Settings" and then "Edit Plot Defs File." Get error message, "Trouble creating file: C:&#92;PROGRA~2&#92;LTC&#92;LTSPIC~1&#92;plot.defs."

I did a search on my harddrive for plot.defs. Not found. Everything on else on the LTspice seems to be working fine. I just hate the default settings for the plots (including FFT plots).

Yes I have been successfully using "Save Plot Settings" and "Reload Plot Settings" on this version. But I'd really like to change the default settings if there is a means of getting the feature to work.

Cheers!

Hello Al,

I think there is an acceptable workaround.
Run LTspice as an administrator when you want edit plotdefs.
Later you can run it normally when you only want execute a plot
function.

Best regards,
Helmut

Python is a very typical academia method and one that I used.

The past few years I have been using VBasic from within Excel for driving
other programs. The primary reason is that Excel is (almost) always there.
It is also very convenient having data and commands lined up in tables with
named ranges often matching variable names. I have used Excel to write text
files of SPICE net lists that are compatible with the SPICE du jour ...
then kick off that SPICE engine to run using that file. I use various
fields (rows) in Excel to compile the command lines. This is convenient in
that the lines can be made manual initially before the real VBasic prose is
written. This requires no direct interaction with the other program.
Nothing like OLE that I suggest below. Excel's VBasic is just a language
already installed if Excel is present of course.

I used to extract multi-pin connector models. The Ansoft field solver
created C & L files with 1000s of lines that the macro/VBasic scripts
massaged & reduced in Excel. In that process the SPICE syntax was added.
Eliminated were the extremely small coupling values that contributed
nothing but SPICE convergence errors.

There is a learning curve for either approach. But there are many books &
online examples for either approach.

Last, I wish that LTspice had the OLE engine. OLE is what gives many
programs the built in capability of directly communicating with other
programs and adds VBasic of some sort to the program with OLE. I had iSpice
once upon a time and had done quite a bit of pre- & post- processing with
this. But iSpice is/was too uncommon for any sort of customer support or
public support of "this is how you do it".

Just thought that I would get my 2� in.
-Jeff

On Sun, Jul 7, 2013 at 2:35 PM, Howard Hansen <hrhan@...> wrote:

**


Hello Yang,

Here is a procedure you could use to run LTspice from within Python.
This procedure is appropriate for Windows. If you are using Linux or Mac
OS X you may need to modify this procedure.
First set the "Path" Environment Variable to C:&#92;Program Files&#92;LTC&#92;LTspceIV
Next run Python and enter the following commands
import os
os.chdir("To your net list folder")
cmd = "scad3.exe your net list"
os.system(cmd)

Setting the "Path" Environment Variable and changing Python's current
working folder to your net list folder saves a lot typing and eliminates
a lot of typing errors. If you use the -b command line option with
LTspice, LTsice will not open a Window.

Howard


On 7/5/2013 2:44 AM, He wrote:

Hallo Tim,

Thank u very much for the message, i know that i can use python to
write the script. but i don't know how should i programm then i can
use the python to call LTspice. can you show me an example? or just
how should i script? i cant find it in the internet. thanks again!

regards
Yang

--- In LTspice@... <mailto:LTspice%40yahoogroups.com>, Tim
Jameson <tim@...> wrote:

He:
This can be done using Python (or bash scripting), and examining the

net

list, and modifying the appropriate value on the R line for the

variable

resistor, and calling ltspice to run the simulation.

I understand not wanting to use the .op command, but it is really much
easier to use, and you can vary up to three (3) parameters with it.

I have

even seen ways to access a table which allows you to vary more than 3
parameters.

Tim


On Tue, Jul 2, 2013 at 8:33 PM, Renan Birck Pinheiro <
renan.ee.ufsm@...> wrote:

**


2013/7/1 He <he.yang@...>

How through external program calls LTspice, I would like a variable
resistor value from 0 to 100K, a variable power supply

simulation. do not

use LTspice's . Op statements. But through external programming.

Some

people know which software and how programming?

You could write a program that builds netlists for you and then runs
LTspice with the netlist it just created.

--
Renan Birck Pinheiro - Chip Inside Engenharia e
Tecnologia<>
Acad. Engenharia El閠rica <> -
UFSM<>- Santa Maria, Brasil
- +55 55 91162798

*Talk is cheap, show me the code*. - Linus Torvalds

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

--
Jeffrey L Walden

EMC/SI RF analysis and product development

jwalden@...
(866)547-5365

Hello All of You,

A great day today:
I have had to run a full "Recovery" from my VISTA ( first time).
I can now open "all_files.htm" right from the club.
So I have to apologize for my spam.
Regards,
Philippe

John,

Thanks for the good intel. I'm running Windows 7 Home Premium, Serv Pack 1.

The LTspice executable program, scad3.exe, is located in
C:&#92;Program Files (x86)&#92;LTC&#92;LTspiceIV
Is that the correct place to add a plot.defs file?

Where can I get such a file? I looked through the this groups files and could not find one.

Al

Hello Yang,

Here is a procedure you could use to run LTspice from within Python.
This procedure is appropriate for Windows. If you are using Linux or Mac
OS X you may need to modify this procedure.
First set the "Path" Environment Variable to C:&#92;Program Files&#92;LTC&#92;LTspceIV
Next run Python and enter the following commands
import os
os.chdir("To your net list folder")
cmd = "scad3.exe your net list"
os.system(cmd)

Setting the "Path" Environment Variable and changing Python's current
working folder to your net list folder saves a lot typing and eliminates
a lot of typing errors. If you use the -b command line option with
LTspice, LTsice will not open a Window.

Howard

In message <krc9s0+h4ki@...>, dated Sun, 7 Jul 2013, Al <alhastings314@...> writes:

After I Run a simulation, I click on the .raw window to activate the window. Click "Plot Settings" and then "Edit Plot Defs File." Get error message, "Trouble creating file: C:&#92;PROGRA~2&#92;LTC&#92;LTSPIC~1&#92;plot.defs."

Windows Vista, 7 and 8 do not allow programs to create files in Program Files folder. Without more knowledge of how your files are organized, I can't tell you how to overcome this. The Path above is written for DOS - maximum eight characters.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

I'm using LTspice version 4.19i and can not get "Edit Plot Defs File" to work. I don't know if this feature existed or worked on earlier versions or not.

After I Run a simulation, I click on the .raw window to activate the window. Click "Plot Settings" and then "Edit Plot Defs File." Get error message, "Trouble creating file: C:&#92;PROGRA~2&#92;LTC&#92;LTSPIC~1&#92;plot.defs."

I did a search on my harddrive for plot.defs. Not found. Everything on else on the LTspice seems to be working fine. I just hate the default settings for the plots (including FFT plots).

Yes I have been successfully using "Save Plot Settings" and "Reload Plot Settings" on this version. But I'd really like to change the default settings if there is a means of getting the feature to work.

Cheers!

--- In LTspice@..., "sawreyrw" <sawreyrw@...> wrote:

--- In LTspice@..., "jtanalog" <ltlist@> wrote:

--- In LTspice@..., "analogspiceman" <analogspiceman@> wrote:

--- In LTspice@..., Jim Thompson "jtanalog" wrote:

Is there any way, in a LTspice plot, to _display_ the average
of a waveform over a specified interval? Something like the
AVGX mechanism in PSpice's Probe?

Mike Engelhardt has stated that he is philosophically opposed to
such imprecise functions. What is average? Is it an analog low
pass filter function or a numerical sliding average? [snip]

Simpson's Rule? Doesn't have corners or any of those other nasty analog limitations ;-)

-Jim Thompson

Jim,

Yes, it does. Over what time interval? How many samples? Does every sample have equal weight? etc?

Rick

The time interval would be a user-specified parameter, as in PSpice's AVGX function in Probe (same as LTspice's plot window).

As for samples and "equal weight", you've never actually used Simpson's Rule have you ?:-) Back in the good old days it was used as an employments exam question... show the candidate a squiggly curve and ask him to compute the integral >:-}

-Jim Thompson

Try the Cadsoft offcie in Florida. They have always been extremely helpful. I was sorry when Newark bought them and was afraid those who usually helped me might get eliminated.

Hi there,

dows anybody have an idea for modelling a inductance with a permeability in dependency of frequency ??

I could not find anything in the messages ?!

Herbert

Dear John:



Thank you very much for your feedback, I will be revising the video this
morning



to make the necessary corrections.







Sincerely,





Julio Rodriguez















_____

From: LTspice@... [mailto:LTspice@...] On Behalf Of
John Woodgate
Sent: Sunday, July 07, 2013 7:56 AM
To: LTspice@...
Subject: Re: [LTspice] Re: A link to an IMD (Intermodulated Distortion)
video Part 1





In message <krbh5p+hur0@... <mailto:krbh5p%2Bhur0%40eGroups.com> >,
dated Sun, 7 Jul 2013, Lawrence
<lawrence_joy@... <mailto:lawrence_joy%40yahoo.com> > writes:

My engineering information defines the order of IMD as "The order of a
given intermodulation product is the sum of the absolute values of the
coefficients". Thus what you have labeled as "First Order Products" is
called "2nd order" and what you have labeled as "Second Order Products"
is called "3rd order".

Yes, according to the International Electrotechnical Vocabulary:

702-07-67

intermodulation product order

a sum p + q + ... of the absolute values of integral coefficients p, q,
... of the formula: f = p*f1 + q*f2 + ... giving the combination
frequency of an intermodulation product in terms of frequencies f1, f2
... of the spectral components at the input of a non-linear device or
transmission medium

The last ten words are not sensible, but the rest is.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

In message <krbh5p+hur0@...>, dated Sun, 7 Jul 2013, Lawrence <lawrence_joy@...> writes:

My engineering information defines the order of IMD as "The order of a given intermodulation product is the sum of the absolute values of the coefficients". Thus what you have labeled as "First Order Products" is called "2nd order" and what you have labeled as "Second Order Products" is called "3rd order".

Yes, according to the International Electrotechnical Vocabulary:

702-07-67

intermodulation product order

a sum p + q + ... of the absolute values of integral coefficients p, q, ... of the formula: f = p*f1 + q*f2 + ... giving the combination frequency of an intermodulation product in terms of frequencies f1, f2 ... of the spectral components at the input of a non-linear device or transmission medium

The last ten words are not sensible, but the rest is.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

Dear Lawrence:





Thanks for your feedback, I have always been under the impression that
first order products were "simple sum or difference"



I will research this further, and make changes as necessary.



Again, thank you very much for feedback.



Sincerely,





Julio Rodriguez











_____

From: LTspice@... [mailto:LTspice@...] On Behalf Of
Lawrence
Sent: Sunday, July 07, 2013 6:51 AM
To: LTspice@...
Subject: [LTspice] Re: A link to an IMD (Intermodulated Distortion) video
Part 1





My engineering information defines the order of IMD as "The order of a given
intermodulation product is the sum of the absolute values of the
coefficients". Thus what you have labeled as "First Order Products" is
called "2nd order" and what you have labeled as "Second Order Products" is
called "3rd order".

Regards, (9V1MI, WN8P) Larry

--- In LTspice@... <mailto:LTspice%40yahoogroups.com> , "Julio
Rodriguez" <juliorz@...> wrote:

Dear All LTspice users:









Below you will find a link to a video that I created on the subject of
IMD, LTspice is used in part 1 (Part 2 confirms the theory of part 1 using
some lab experiments, is has not been released)



to perform simulations that confirm classroom theory.







Part 2 will have lab experiments using a spectrum analyzer, and the same
circuits that were used in part 1.





I expect to release part 2 next week.

















enjoy.





Sincerely,





Julio Rodriguez

My engineering information defines the order of IMD as "The order of a given intermodulation product is the sum of the absolute values of the coefficients". Thus what you have labeled as "First Order Products" is called "2nd order" and what you have labeled as "Second Order Products" is called "3rd order".

Regards, (9V1MI, WN8P) Larry

--- In LTspice@..., "jtanalog" <ltlist@...> wrote:

--- In LTspice@..., "analogspiceman" <analogspiceman@> wrote:

--- In LTspice@..., Jim Thompson "jtanalog" wrote:

Is there any way, in a LTspice plot, to _display_ the average
of a waveform over a specified interval? Something like the
AVGX mechanism in PSpice's Probe?

Mike Engelhardt has stated that he is philosophically opposed to
such imprecise functions. What is average? Is it an analog low
pass filter function or a numerical sliding average? [snip]

Simpson's Rule? Doesn't have corners or any of those other nasty analog limitations ;-)

-Jim Thompson

Jim,

Yes, it does. Over what time interval? How many samples? Does every sample have equal weight? etc?

Rick

--- In LTspice@..., "analogspiceman" <analogspiceman@...> wrote:

--- In LTspice@..., Jim Thompson "jtanalog" wrote:

Is there any way, in a LTspice plot, to _display_ the average
of a waveform over a specified interval? Something like the
AVGX mechanism in PSpice's Probe?

Mike Engelhardt has stated that he is philosophically opposed to
such imprecise functions. What is average? Is it an analog low
pass filter function or a numerical sliding average? [snip]

Simpson's Rule? Doesn't have corners or any of those other nasty analog limitations ;-)

-Jim Thompson

--- In LTspice@..., "Helmut" <helmutsennewald@...> wrote:

--- In LTspice@..., "jtanalog" <ltlist@> wrote:

--- In LTspice@..., "Helmut" <helmutsennewald@> wrote:

--- In LTspice@..., "jtanalog" <ltlist@> wrote:

Is there any way, in a LTspice plot, to _display_ the average of a waveform over a specified interval? Something like the AVGX mechanism in PSpice's Probe?

-Jim Thompson

Hello Jim.

Unfortunately it's not possible to directly define a formula
with integration in the waveform viewer. One has to make a
Bv-source in the schematic or netlist.

.param d=100u
.func avgx(x,d) {(idt(x)-delay(idt(x),d))/d}

BV1 avgout 0 V=avgx(V(out),d)

BV2 avg37 0 V=avgx(V(37),d)

By the way you don't need a Bv-symbol. You could directly add
these SPICE-lines from above to your schematic. You will need
one B-device SPICE-line for every item you want to average.

I tried an example and found it's necessary to define a small
max time step in .TRAN and to switch off data compression for
best results.

.options plotwinsize=0 ; data compression off

The text after ';' is only comment.

Best regards,
Helmut

Thanks, Helmut! That's what I was looking for.

Is it possible to define your own set of functions (maybe in a library somewhere) that can be used later?

(I still haven't found the VDMOS tool. Can you give me a link?)

-Jim Thompson

Hello Jim,

Only plot-formulas could be in a central file managed by LTspice,
but this is dangerous when you over-install LTspice intentionally
or by accident or when you move to another PC and have forgotten
it.You could have your functions in your own file and .lib it to
your schematic.

The VDMOS-tools you asked for is in the folder Software.

Files > Util > Files > Util > Model Tools > Board Level MOSFET (VDmos)> Software




Another program is this one.

Files > Util > vdmos171.zip




Both programs will still require hand tuning.

Best regards,
Helmut

Thanks!

Dear All LTspice users:









Below you will find a link to a video that I created on the subject of
IMD, LTspice is used in part 1 (Part 2 confirms the theory of part 1 using
some lab experiments, is has not been released)



to perform simulations that confirm classroom theory.







Part 2 will have lab experiments using a spectrum analyzer, and the same
circuits that were used in part 1.





I expect to release part 2 next week.

















enjoy.





Sincerely,





Julio Rodriguez

Hello Helmut,



I did click on the box after 10 seconds, but only got 82 bytes as the
download using IE 10. I copied the address and used Chrome. Then I did get
the full 31.98 MB file download, must be something missing in my version of
IE10. Thank you for letting me know that the box was supposed to work.



Gene



From: LTspice@... [mailto:LTspice@...] On Behalf Of
Helmut
Sent: Saturday, July 06, 2013 3:38 PM
To: LTspice@...
Subject: [LTspice] Re: My collection of models and examples for LTspice.





Hello Gene,

You have to click the "button" below the 31.98. It's enabled
after 10 seconds.

Best regards,
Helmut

--- In LTspice@... <mailto:LTspice%40yahoogroups.com> , "Gene
Neau" <glneau@...> wrote:

Hello,

Neither this 31.98Meg nor the previous 98Meg files appear to have working
links. I see a timer that counts down and only when it reaches 0 is there

a

box that may be a link, but the downloaded file is an index.html of 1 kB.
Could you please provide more information on how to download the files.
Thank you.

Gene



From: LTspice@... <mailto:LTspice%40yahoogroups.com>

[mailto:LTspice@... <mailto:LTspice%40yahoogroups.com> ] On
Behalf Of

bordodynov
Sent: Thursday, July 04, 2013 11:55 PM
To: LTspice@... <mailto:LTspice%40yahoogroups.com>
Subject: [LTspice] My collection of models and examples for LTspice.





Hello All.
My collection of models and examples for LTspice contains a large number

of

models. It includes a collection of EXTRA. This collection EXTRA I

expanded

with new models and changed the characters of digital items. Now you do

not

need a reference to the library. The collection contains a lot of
operational amplifiers described in bulk (one character and a lot of
models). Also, it has a model of the photodiodes, avalanche photodiodes,
avalanche transistors, lasers, and many other items. In folder example a

lot

of good examples.
File is LTspiceIV.zip (34Meg).
Link --->

Bordodynov.