Original report (archived issue) by Shaun Johnstone (Bitbucket: shjohnst, GitHub: shjohnst).

The simplistic implementation of shutter delays can result in undesired results.

For example if the delays are:

#!python

open_delay = 3e-3
close_delay = 5e-3

and you call:

#!python

shutter.open(t)
shutter.close(t+1e-3)

then the command to close the shutter ends up coming before the command to open it.

This will result in the shutter opening at the correct time, but never closing.

Similarly the delays may be such that the open command is overwritten by the close command, so the shutter will never open (though in this case labscript will at least warn the user).