LTspice Waveform Cursors w/ .step
analog
Mike Elliott, Helmut Sennewald, Mike E, Helmut S, Mike E wrote:
...
>>>>> I'm running a simulation that has a stepped parameter and am
>>>>> viewing only one node in waveform viewer. I'd like to use the
>>>>> attached cursors to measure the various stepped waveforms. But
>>>>> the cursors remain stubbornly attached to one of the resultant
>>>>> waveforms. How can I get the darn cursors to switch to some of
>>>>> the node's other waveforms?
>>>>
>>>> Hello Mike,
>>>> you can use the the up and down keys(arrows) on your keybaord
>>>> to step from one curve to the next.
Programs! You can't tell your curves without a program. :)
For a parameter guide, display the "SPICE error log" text file in a
small window on top of the output file's family of curves (accessed
from the "View" drop down menu in the schematic window).
>>> Brilliant. Mystery solved. How'd you discover that technique?
>>
>> Hello Mike, I think it is still not explained in the help pages.
>> I have that knowledge from a thread in this news group.
>>
>> Others collect stamps. I have collected all useful information
>> regarding SwitcherCADIII/LTSpice from the news groups since
>> October 2001.
>
> I think it is time to create the "Unofficial Guide to LTSpice".
Yes, high time, indeed.
LT spice seems to have quite a few "hidden" capabilities that have
slipped through the documentation cracks. These include: the
procedure to add an initial condition to a capacitor or inductor
(ctrl-right click over the component to access the Component
Attribute Editor and add the IC statement to the "Value 2" line),
that "ctrl-x" works as delete, that "ctrl-v" (which normally seems
superfluous) only functions as paste when pasting between schematic
windows, that the ground symbol and net names automatically orient
themselves depending on the direction of the wire to which they are
attached, that "re" and "im" are valid operators for waveform math,
that any signal (regardless of whether it's a voltage or current)
can be displayed on either axis via the properties menu, that "ctrl-
enter" works as well as "ctrl-m" for entering a line return when
entering spice or comment text, that B source table functions *must*
go from the smallest (most negative) x value to the largest.
What other LT Spice mysteries remain to be uncovered? analog
Mike Elliott
@ieee.org>, . . .
> Mike Elliott, Helmut Sennewald, Mike E, Helmut S, Mike E wrote:
> ...
> >>>>> I'm running a simulation that has a stepped parameter and am
> >>>>> viewing only one node in waveform viewer. I'd like to use the
> >>>>> attached cursors to measure the various stepped waveforms. But
> >>>>> the cursors remain stubbornly attached to one of the resultant
> >>>>> waveforms. How can I get the darn cursors to switch to some of
> >>>>> the node's other waveforms?
> >>>>
> >>>> Hello Mike,
> >>>> you can use the the up and down keys(arrows) on your keybaord
> >>>> to step from one curve to the next.
>
> Programs! You can't tell your curves without a program. :)
>
> For a parameter guide, display the "SPICE error log" text file in a
> small window on top of the output file's family of curves (accessed
> from the "View" drop down menu in the schematic window).
Okay, that sounds intriguing. But my schematic's "View" dropdown has the
"SPICE error log" grayed out. After a simulation. What's the trick to
accessing that function?
> > I think it is time to create the "Unofficial Guide to LTSpice".
>
> Yes, high time, indeed.
>
> LT spice seems to have quite a few "hidden" capabilities that have
> slipped through the documentation cracks. These include: the
> procedure to add an initial condition to a capacitor or inductor
> (ctrl-right click over the component to access the Component
> Attribute Editor and add the IC statement to the "Value 2" line),
> that "ctrl-x" works as delete, that "ctrl-v" (which normally seems
> superfluous) only functions as paste when pasting between schematic
> windows, that the ground symbol and net names automatically orient
> themselves depending on the direction of the wire to which they are
> attached, that "re" and "im" are valid operators for waveform math,
> that any signal (regardless of whether it's a voltage or current)
> can be displayed on either axis via the properties menu, that "ctrl-
> enter" works as well as "ctrl-m" for entering a line return when
> entering spice or comment text, that B source table functions *must*
> go from the smallest (most negative) x value to the largest.
>
> What other LT Spice mysteries remain to be uncovered?
My waveform math is pretty weak -- what do "re" and "im" operators do?
We needs a volunteer to post this stuff on a handy web page.
MikeE
Kevin Aylward
Real and imaginary.
Kevin Aylward
sa...@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.
Mike Elliott
@newsfep1-win.server.ntli.net>, . . .
Oh. Duh.
MikeE
analog
Mike Elliott, analog, Mike Elliott wrote:
>> For a parameter guide, display the "SPICE error log" text file in a
>> small window on top of the output file's family of curves (accessed
>> from the "View" drop down menu in the schematic window).
>
> Okay, that sounds intriguing. But my schematic's "View" dropdown has
> the "SPICE error log" grayed out. After a simulation. What's the
> trick to accessing that function?
Ctrl-tab over to the schematic window (it must be the active window)
and it will no longer be grayed out. Now downsize and scroll the text
window such that only the parameter information shows. Finally, move
the text window to an edge of the LT Spice screen and resize the graph
window so both show at once.
>>> I think it is time to create the "Unofficial Guide to LTSpice".
>>
>> Yes, high time, indeed.
>>
>> LT spice seems to have quite a few "hidden" capabilities that have
>> slipped through the documentation cracks. These include: the
>> procedure to add an initial condition to a capacitor or inductor
>> (ctrl-right click over the component to access the Component
>> Attribute Editor and add the IC statement to the "Value 2" line),
>> that "ctrl-x" works as delete, that "ctrl-v" (which normally seems
>> superfluous) only functions as paste when pasting between schematic
>> windows, that the ground symbol and net names automatically orient
>> themselves depending on the direction of the wire to which they are
>> attached, that "re" and "im" are valid operators for waveform math,
>> that any signal (regardless of whether it's a voltage or current)
>> can be displayed on either axis via the properties menu, that "ctrl-
>> enter" works as well as "ctrl-m" for entering a line return when
>> entering spice or comment text, that B source table functions *must*
>> go from the smallest (most negative) x value to the largest.
>>
>> What other LT Spice mysteries remain to be uncovered?
>
> My waveform math is pretty weak -- what do "re" and "im" operators do?
Real and imaginary parts of a complex number. For example, when a
circuit is excited with a 1 amp ac current source, the equivalent
input impedance verses frequency can be displayed as follows:
L1_equivalent_series = im(V(1))/(2*pi*freq)
R1_equivalent_series = re(V(1))
C1_equivalent_parallel = im(1/V(1))/(2*pi*freq)
R1_equivalent_parallel = re(1/V(1))
> We needs a volunteer to post this stuff on a handy web page.
Ok, I volunteer Helmut or LT Mike. :) -- analog
Mike Elliott
>
> >> For a parameter guide, display the "SPICE error log" text file in a
> >> small window on top of the output file's family of curves (accessed
> >> from the "View" drop down menu in the schematic window).
> >
> > Okay, that sounds intriguing. But my schematic's "View" dropdown has
> > the "SPICE error log" grayed out. After a simulation. What's the
> > trick to accessing that function?
>
> Ctrl-tab over to the schematic window (it must be the active window)
> and it will no longer be grayed out.
Odd. Clicking on the Schematic window did not make "View | SPICE Error
Log" available. But ctrl-tab'ing over to it does ungray it. Am I going
mad? Or is this another secret LTspice thingy?
MikeE
qrk
LTspice is pretty much compatible with Pspice syntax. Some of the
questions you ask are covered in the Pspice reference guide. You can
download an old version at:
ftp://ftp.ntua.gr/pub/pc/Pspice/Student_version_9_1/PSPCREF.PDF
This is a good basic spice reference with a smattering of Pspice
twists.
In fact, you might find some other useful info at:
ftp://ftp.ntua.gr/pub/pc/Pspice/index.html
What is really needed for LTspice is a Users Manual and Reference
Manual in PDF. That's a pretty large undertaking.
-
Mark Chun
Santa Barbara, CA
Ralph Wallace
> On Tue, 18 Feb 2003 14:36:28 GMT, Mike Elliott
> <j.michae...@REMOVETHEOBVIOUScoxDOT.net> wrote:
>
>
> What is really needed for LTspice is a Users Manual and Reference
> Manual in PDF. That's a pretty large undertaking.
>
> -
> Mark Chun
> Santa Barbara, CA
free reader for it)
Cheers,
Ralph
Mike Elliott
<uet55vgfno4a2av6c...@4ax.com>, . . .
> >
> >MikeE
>
> LTspice is pretty much compatible with Pspice syntax. Some of the
> questions you ask are covered in the Pspice reference guide. You can
> download an old version at:
> ftp://ftp.ntua.gr/pub/pc/Pspice/Student_version_9_1/PSPCREF.PDF
> This is a good basic spice reference with a smattering of Pspice
> twists.
>
> In fact, you might find some other useful info at:
> ftp://ftp.ntua.gr/pub/pc/Pspice/index.html
>
> What is really needed for LTspice is a Users Manual and Reference
> Manual in PDF. That's a pretty large undertaking.
>
> -
> Mark Chun
> Santa Barbara, CA
>
Thanks, Mark. Good stuff, that first link (manual). Now a proud member
of my "favorites."
MikeE
Spehro Pefhany
<ra...@rwallace.com> wrote:
>>Not PDF, you can't search it. Maybe text, html, or MS word( there is a
>free reader for it)
What do you mean by "can't search it" ? Unless it's scanned, you
should be able to, but perhaps not by *nix grep or whatever.
Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
sp...@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
qrk
wrote:
PDF is searchable. I search thru PDF data sheets, manuals, and books
often. Try Ctrl-f and F3.
Text manual is no good since images are necessary. html is the worst
manual format due to piss poor searching capability (unless you use
grep), poor compression, special symbols problems, poor print control,
and the multi-file nature of html documentation. Personally, I would
use a word processor, like OpenOffice or Word, to author the document
and distribute as an unprotected PDF.