Krivx and the group,
The increase in distortion to around 2% by increasing the time 200ms can be explored in this experiment:
![](https://www.eevblog.com/forum/beginners/lt-spice/?action=dlattach;attach=132775;image)
In this first test I have set the time to 200ms and the reported THD is 2.12%. The THD should be zero, since we are testing a pure sine wave source.
If I add a maximum time step limitation to the simulate command, to limit the maximum time to 0.1u, like this:
![](https://www.eevblog.com/forum/beginners/lt-spice/?action=dlattach;attach=132777;image)
I get a more sensible result.
The increase in distortion comes from the limited number of points in the data collected during the simulation.
Regards,
Jay_Diddy_B