LT Spice plot axis question

[John Larkin]

Are there command lines to change the waveform axes? I want to do a
frequency sweep with y-axis in volts, in a fixed range. The HELP isn't
much help.

I can do it manually, every time I do a run, but that gets tiresome.

Basically, I built a sort of VNA to analyze a control system. Instead
of running a zillion test cases with various loads, I thought that
looking at loop Zout would spot troublesome things. If the output is
real-resistive at all frequencies, no passive load should make it
oscillate.

--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

 

[John Larkin]

On Wed, 06 Nov 2019 13:20:35 -0800, John Larkin
<jlarkin@highland_atwork_technology.com> wrote:

Are there command lines to change the waveform axes? I want to do a
frequency sweep with y-axis in volts, in a fixed range. The HELP isn't
much help.

I can do it manually, every time I do a run, but that gets tiresome.

Basically, I built a sort of VNA to analyze a control system. Instead
of running a zillion test cases with various loads, I thought that
looking at loop Zout would spot troublesome things. If the output is
real-resistive at all frequencies, no passive load should make it
oscillate.

There's no visible directive. But if you click in the plot plane, then
the Plot Settings tab pops up, and you can save the current plot
settings, which makes a file like "P900_VNA_2.plt", which will be used
in the future.


--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

 

On Wednesday, November 6, 2019 at 5:16:27 PM UTC-5, John Larkin wrote:

On Wed, 06 Nov 2019 13:20:35 -0800, John Larkin
jlarkin@highland_atwork_technology.com> wrote:



Are there command lines to change the waveform axes? I want to do a
frequency sweep with y-axis in volts, in a fixed range. The HELP isn't
much help.

I can do it manually, every time I do a run, but that gets tiresome.

Basically, I built a sort of VNA to analyze a control system. Instead
of running a zillion test cases with various loads, I thought that
looking at loop Zout would spot troublesome things. If the output is
real-resistive at all frequencies, no passive load should make it
oscillate.

There's no visible directive. But if you click in the plot plane, then
the Plot Settings tab pops up, and you can save the current plot
settings, which makes a file like "P900_VNA_2.plt", which will be used
in the future.


--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

not sure if this answers your question, here are some of my notes

to tURN OFF AUTORANGING TO USE PRESET RANGES
In the plot
right click uncheck autorange
SAVE the plot settings into the .plt file for reuse
click PLOT SETTINGS (on the tool bar) / Save plot settings
NOTE, the saved plot settings will NOT be automatically reused, you MUST reload plot settings each time you run a simulation., this is a PIA. SEE HOTKEY setting below

SET a HOTKEY
tools/control panel/waveform/hotkeys
Set Reload plot settings = F2
You have to select the plot window then hit F2 for the saved the plot settings to take effect

Mark

 

[Helmut Sennewald]

Am 13.11.2019 um 18:52 schrieb makolber@yahoo.com:

...
SET a HOTKEY
tools/control panel/waveform/hotkeys
Set Reload plot settings = F2
You have to select the plot window then hit F2 for the saved the plot settings to take effect

Mark

Hello,

"Reload Plot Settings" is mapped to the space-bar of the keyboard by
default in LTspiceXVII.

Run the simulation. When finished, hit the space-bar to get the plot
again with the saved plot setting.

Helmut

 

[John Larkin]

On Thu, 14 Nov 2019 22:31:39 +0100, Helmut Sennewald
<helmutsennewald@t-online.de> wrote:

Am 13.11.2019 um 18:52 schrieb makolber@yahoo.com:
...
SET a HOTKEY
tools/control panel/waveform/hotkeys
Set Reload plot settings = F2
You have to select the plot window then hit F2 for the saved the plot settings to take effect

Mark


Hello,

"Reload Plot Settings" is mapped to the space-bar of the keyboard by
default in LTspiceXVII.

Run the simulation. When finished, hit the space-bar to get the plot
again with the saved plot setting.

Helmut

In the schematic pane, spacebar refits the schematic to the window.

In the plot pane, space does reload the .plt file settings. I didn't
know that.



--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com