10 seconds in 3 minutes ....
That's around a 5.5% error, and the OSC would be 7,555,556 Mhz.
http://spreadsheets.google.com/pub?k...uiCKE-EFrRLaZA
I think you're right about it not being the OSC
Are you using the Timer Template, or the Elapsed Timer?
Bookmarks