Scope readings <-> possible reasons

Onvinyl · 23rd January 2007, 09:38 PM

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

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.

I_F

jcx · 24th January 2007, 02:03 AM

Linear.com App note 47 High Speed Amplifier Techniques

http://www.linear.com/pc/downloadDoc...28,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!
Rüdiger

23rd January 2007, 09:38 PM	#1
Onvinyl diyAudio Member Join Date: Aug 2002 Location: Germany	Scope readings <-> possible reasons 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 __________________ "I can feel what's going on inside a piece of electronic equipment. I have a sense that I know what's going on inside the transistors." Robert Moog

24th January 2007, 01:07 PM	#4
Onvinyl diyAudio Member Join Date: Aug 2002 Location: Germany	jcx, I_F, thanks a lot, that will keep me going! Rüdiger __________________ "I can feel what's going on inside a piece of electronic equipment. I have a sense that I know what's going on inside the transistors." Robert Moog

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23rd January 2007, 11:20 PM	#2
I_Forgot diyAudio Member Join Date: Jan 2005 Location: Phoenix, Az.	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

24th January 2007, 02:03 AM	#3
jcx diyAudio Member Join Date: Feb 2003 Location: ..	Linear.com App note 47 High Speed Amplifier Techniques http://www.linear.com/pc/downloadDoc...28,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

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