[Diabolical Artificer]

That's a lovely phosphor on your scope, a really deep green. The doubling up your seeing can be normal trigger behaviour whilst the trigger tries to latch or isn't quite set right. Also on a lot of scopes triggering at low sweep speeds is problematic. Every scope has its quirks and anomalies, some trigger really well, others don't, not sure how good a Dynamco is supposed to be..


Audacity and a bit of free software called Soundcard Scope both have decent sig gens in them, Try a 1khz sine on the 1ms/div setting, if it doesn't trigger on that it'd be worth investigating into.

Andy.