Velleman Oscilloscope

Here's a screenshot of it in action. The blue is the signal of interest. The red is a square wave the unit is generating itself that I'm using as a trigger.



The blue line is the video portion of the output of my Flip camera. Note: for more detail, click on the image and use your browser's magnification function. At 2x magnification, you can clearly see the back porch burst oscillations (see graph below for labels of portions of the curve). If you measure them out, their duration comes pretty close to 2.5 microseconds, as the standard dictates.


For reference, here's a graph from Cornell University on the signal encoding in NTSC: