Compression

LTspice uses lossy compression at run time to produce raw data files that are significantly smaller than otherwise uncompressed files.

Note: Compression settings are reset to defaults between program invocations. We recommend leaving default settings for most runs. Nevertheless, you should turn off compression when using .four statements or doing FFTs in post analysis of your data by using the SPICE directive:

.options plotwinsize=0.

To enforce particular tolerances or a window size in a schematic, add the .options SPICE directive with parameters plotreltol, plotvntol, plotabstol or plotwinsize.

Window Size (No. of Points): Maximum number of points that can be compressed into two end points. Set to zero to turn off waveform compression.

Relative Tolerance: The relative error allowed between the compressed data and the uncompressed data.

Absolute Voltage tolerance[V]: The voltage error allowed by the compression algorithm.

Absolute Current tolerance[A]: The current error allowed be the compression algorithm.