Videos - cathode ray oscilloscope

Some useful links for CRO videos suitable for A-level or university from Youtube :

GCE (A-level) Physics E29 The Oscilloscope - YouTube 
Good clear introduction to basic CRO use mostly using diagrams. Examples of making measurements of voltage and frequency. 11mins

The Oscilloscope - YouTube  http://www.youtube.com/watch?v=5yNDSkQBEy0&feature=related
A good introduction to a more complex (dual-beam) CRO. The CRO is shown in action. 5mins

AC vs DC Explained and How to Use an Oscilloscope - YouTube 
Another look at basic CRO use using a real CRO and also using a CRO with a PC. 12mins