Problem with .step in LTSpice

[Paul Burridge]

Hi,

I've come across an odd problem in the simplified circuit I'm posting
to a.b.s.e under the same subject title as this message.
I can't seem to get LT to step through 3 drain resistor values whilst
performing a DC sweep of Vgs. It should amount to just 30 iterations
in total, but LT is sweeping through over 22,000 when I include "oct"
in the .step statement. I can't get it to run at all without "oct" in
that line and I've never had to use "oct" at all for a step run
before. Can anyone tell me if the syntax for this kind of check has
changed recently and/or what the correct syntax should be?

Thanks,

p.
--

"What is now proved was once only imagin'd." - William Blake, 1793.

 

[Paul Burridge]

On Mon, 16 Aug 2004 20:43:20 GMT, "Mike Engelhardt" <nospam@spam.org>
wrote:

.step param R 1k 5k 1k ; step from 1K to 5K in 1K steps
.step oct param R 1K 5K 10 ; step from 1K to 5K in 10 steps per octave

Great; thanks, Mike.
Is there a comprehensive manual on LTS anywhere on the 'net or in
print form that covers all the functionality of the program? A help
file alone doesn't really do it justice.
--

"What is now proved was once only imagin'd." - William Blake, 1793.

 

[Mike Engelhardt]

Paul,

.step param R 1k 5k 1k
.step oct param R 1K 5K 10

Great; thanks, Mike.
Is there a comprehensive manual on LTS anywhere on the 'net
or in print form that covers all the functionality of the
program? A help file alone doesn't really do it justice.

The help file is only officially supported document, but you
can get that as a printable .pdf from

http://LTspice.linear-tech.com/software/scad3.pdf

Another good source of info is the independent users' group
at http://groups.yahoo.com/group/LTspice

--Mike