It was written...
No idea though where to find a website teaching scope
usage, but maybe
Tony Duell know a few????
See:
http://www.doctronics.co.uk/scope.htm
and
http://www.facstaff.bucknell.edu/mastascu/eLabs/Scope/Scope1.html
and the best yet.... a virtual oscilloscope you can use online ...
http://www.virtual-oscilloscope.com/simulation.html
Regards,
Jay West