Okay. Stupid question alert!
How should we be generating the DC signals of 0V and +3V to calibrate?
Wow. I can't believe anyone asked such a stupid question. I sure do wish someone would answer it, because I've been wondering the exact same thing. Here's another question that I bet's even more stupid: How is a 0V signal different from no signal at all?
Sheepishly (but I *have* been reading up!),