Author Topic: Tektronix 2225  (Read 25370 times)

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Offline SuperMiguel

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Re: Tektronix 2225
« Reply #50 on: October 20, 2010, 06:53:13 pm »
changed it to 2KHz and got:

 

Offline saturation

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Re: Tektronix 2225
« Reply #51 on: October 20, 2010, 08:15:52 pm »
I agree with strube09, you're getting really close.  The estimate of 22kHz was a ball park figure, but lower it to 1kHz and see. 



Yep... looks about as good as a sound card could probably produce... I bet at around 1K it would look almost there. ... just depends on how many harmonics the sound card can produce at once.... if it will only produce 4 or 5 odd harmonics at once then you probably won't get much better.
Best Wishes,

 Saturation
 

Offline Strube09

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Re: Tektronix 2225
« Reply #52 on: October 20, 2010, 08:23:42 pm »
This is kind of a great experiment to show how/where square waves really come from.... The pictures really show it in this thread vs. some drawing in a book.
 

Offline SuperMiguel

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Re: Tektronix 2225
« Reply #53 on: October 20, 2010, 09:04:53 pm »
1KHz


 

Offline saturation

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Re: Tektronix 2225
« Reply #54 on: October 20, 2010, 10:37:00 pm »
It looks like those added waveforms are ringing artifacts caused by, possibly the Gibbs phenomenon particulary when looking at the artifacts at 2 kHz:

http://en.wikipedia.org/wiki/Ringing_%28signal%29

This occurs when the generator of the square wave, if it actually made by summing multiple sine waves together and mixing harmonics 9,7,5,3,etc., of the fundamental to create a square wave, but does do it imperfectly or misses some of the key harmonics, it will create artifacts.

http://en.wikipedia.org/wiki/Gibbs_phenomenon


Nevertheless, the scope can pick it all up easily!



quote author=SuperMiguel link=topic=1535.msg20877#msg20877 date=1287608693]
1KHz



[/quote]
« Last Edit: October 20, 2010, 10:46:36 pm by saturation »
Best Wishes,

 Saturation
 

Offline Time

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Re: Tektronix 2225
« Reply #55 on: October 20, 2010, 11:30:26 pm »
This is kind of a great experiment to show how/where square waves really come from.... The pictures really show it in this thread vs. some drawing in a book.


I agree
-Time
 

Offline Mechatrommer

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Re: Tektronix 2225
« Reply #56 on: October 20, 2010, 11:59:56 pm »
can be a reminder for me too on this harmonics application ;)
if something can select, how cant it be intelligent? if something is intelligent, how cant it exist?
 

Offline SuperMiguel

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Re: Tektronix 2225
« Reply #57 on: October 21, 2010, 01:50:19 am »
so far everything has worked with the scope... so i think it was a good buy for $75 .... Thanks all of you that helped me made the decision and then helped me test it :) thanks
 


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