Scope readings <-> possible reasons

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Hi,
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.
Thanks,
Rüdiger
 
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.

I_F
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.