Tektronix 2225

[SuperMiguel]

changed it to 2KHz and got:

[saturation]

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.

[Strube09]

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.

[SuperMiguel]

1KHz

[saturation]

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]

[Time]

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

[Mechatrommer]

can be a reminder for me too on this harmonics application

[SuperMiguel]

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