Next thing you know, they'll outlaw the teaching of hubris. I thought that within the scientific method one could only disprove rival hypotheses regarding controllably repeatable phenomena. It would seem to me that the creation of the universe, or for that matter the origin of species, even for the unestimably gifted evolutionists, would be out-of-bounds for strict sense scientific mthod science. I would be careful as well to not use the term "evidence based" as a substitute for the more rigorous specifications of scientific method science. Extrapolating forward or backward in time is anyone's prerogative, mind you, but use of the word "science" should be carefully scoped in any discussion. Thank you and I'll take my beatings off-line.

Forgot to mention ..... With digital sampling scopes: (1) be they standalone units or PC peripherals, the student get a way to document their screenshots; and (2) they can catch a useful range of single-shot events.

Tim / fffdddooo (3692429), Not unlike the Digilent Analog Discovery product (2 channels, 5MHz analog BW), the Embedded Artists Labtool offers 2 channels @ 6MHz analog BW and a AWS generator. The cost is $139USD or $99EU. The URL is: http://www.embeddedartists.com... and it's available from distributors like Mouser.com I think Digilent is ahead with delivered courseware. I'm a community college professor at stcc.edu and I'm looking at the same ideas. One of the milestones for our beginner student is getting the whole time-domain mentality across to them (think ... DuMont Oscillagraph :-) ). Despite my dinosaur upbringing with big Tek 515's and 535's, I think our students could use these PC-peripheral style instruments with no loss of meaning. In actual practice I think we could accomplish our goals with a 200KHz 'scope just as well. As I'm sure you're already aware, most frequency domain discussion nowadays can be effected using FFT software + a digital sampling oscilloscope. Obviously any truly RF stuff is going to require something beyond these low-cost instruments but, for around the same price as a textbook, they can have a scope and signal generator as a takeaway. Best Wishes, Coop