How to include 0.9m start saving data in spice directive?

.trans 1m


1 Answer 1


Right click with the mouse on the text .trans 1m and change it in the dialog box as shown below.

The LTspice directive becomes .tran 0 1m .9m

Explanation of the preceeding zero:
The syntax is: .TRAN <Tstep> <Tstop> [Tstart [dTmax]] [modifiers]
If Tstart or dTmax is specified, Tstep must has to be specified as well. Tstep is the plotting increment for the waveforms but is also used as an initial step-size guess. LTspice uses waveform compression, so this parameter is of little value and can be omitted or set to zero.

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  • \$\begingroup\$ unfortunately, im using the mac version of ltspice which doesn't have the edit simulation command menu, am I right? \$\endgroup\$
    – www
    Oct 19, 2019 at 20:00
  • \$\begingroup\$ @www That's why I added the new spice directive as well. I was already thinking it had to be someting like that. Why would someone ask something very basic for LTspice under Windows? \$\endgroup\$
    – Huisman
    Oct 19, 2019 at 20:03
  • \$\begingroup\$ So if the stop is 1m and start saving data is 0.9m, the directive is .trans 0 1m .9m But when I checked the result, why it still shows the data before 0.9m? \$\endgroup\$
    – www
    Oct 19, 2019 at 20:04
  • \$\begingroup\$ In case the help file doesn't work under Mac, you might be interested in: ltwiki.org/LTspiceHelpXVII/LTspiceHelp.html .. do check the whole site, it's interesting :) \$\endgroup\$
    – Huisman
    Oct 19, 2019 at 20:07
  • \$\begingroup\$ @www Note that the plot window always starts at 0 (and not at e.g. 0.9 msec). Are you sure the window shows the data before this 0.9 ms? An easy way to verify this is adding a Behavioral Voltage Source with V=time and plot that result as well. The voltage should be 0.9mV at t=0s. \$\endgroup\$
    – Huisman
    Oct 19, 2019 at 20:14

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