Oscilloscope Simulation Software.

Here are a couple of links which will take you to two very useful teaching aids.

Both are based around the theme of training students (or in fact anyone) to use an oscilloscope. The first is probably best used for Key stage 4 however will act as a good introduction to AS Physics.

http://www.ltscotland.org.uk/5to14/resources/science/oscilloscope.asp

This one is much more advanced and uses a good quality graphic of a Hameg scope.

http://www.virtual-oscilloscope.com/simulation.html