Download Bruce W’s PHD_Dither 1b from the PHD2 website and unzip the files into a folder such as “phd dither” There are a couple of apps that allow you to set things up, the dither script and a pdf file that explains it all.
The trick to get it to work with Artemis is to fire up the sequencer and on the right you will see a “system command” column. In here you write the command to initiate the dither script, so it would be something like C:\phd dither\Dither_script.vbs. You can add a delay between subs in the sequencer (bottom left) to allow things to settle down after the dither before starting the next capture.