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Onvinyl 23rd January 2007 09:38 PM

Scope readings <-> possible reasons
is anyone aware of an (online or book) resource, where several scope pictures (like overshoot on a square-wave) an their possible reasons are discussed ? Some are intiutive to me, but some are not.
At the moment, I'm having an otherwise good looking square-wave with an additional step on the top, like this:


I'm in the process of tweaking the feedback path of a discrete pre, so I often run into funny (to me) slopes and envelopes, and such a resource would be great.

I_Forgot 23rd January 2007 11:20 PM

First, have you tuned the probe's capacitance to match the Z in of the scope? This is what calibrator signals are for in scopes. You connect the probe to it then use a tiny screw driver to adjust the capacitance in the little box that is part of the probe's connector until you get a clean looking square wave.

Do that before judging anything going on at the rising edge of a waveform.


jcx 24th January 2007 02:03 AM App note 47 High Speed Amplifier Techniques,P1219,D4138

really big - slow to load even with dsl

because it has lots of 'scope photos

including appendix A: ABC's of probes - written by tektronix staff
sarting p69

Onvinyl 24th January 2007 01:07 PM

jcx, I_F,
thanks a lot, that will keep me going!

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