On Mon, 11 Feb 2013 14:55:42 -0000, "N_Cook"
wrote:

Without differential scope amplifier/probe,

Then get a differential scope. You have one in your computah in the
form of the stereo input of your sound card. Just install an
oscilloscope emulator program. Put some large value resistors in
series with the inputs so you don't blow anything up. Favorite
softwa
http://www.sillanumsoft.org
You'll also find it handy when troubleshooting constant voltage
speaker system.

Incidentally, looking at my pile of about 15 assorted scopes (dead and
alive), the only one that doesn't have a differential input is an
ancient Heath Vectorscope. Finding two scope probes that are matched
and/or haven't been broken by my mishandling is a bit more difficult.


--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558