oscilloscope uses?

[buschfsu]

ok less talk more action... so i ran a line out of my pc freq generator and put a sine wave into my new scope. looks great. when i put a square wave into it it had batman heads on the horizontal sections of the square waves. does this tell me that the quality of the pc soundcard is below par? i get perfect square waves with the scopes internal calibrator.

trying to figure out how to evaluate with this thing... :?

 

[JohnRoberts]

[quote author="buschfsu"]ok less talk more action... so i ran a line out of my pc freq generator and put a sine wave into my new scope. looks great. when i put a square wave into it it had batman heads on the horizontal sections of the square waves. does this tell me that the quality of the pc soundcard is below par? i get perfect square waves with the scopes internal calibrator.

trying to figure out how to evaluate with this thing... :?[/quote]

Did it look like "Gibbs" phenomenon?

http://www.sosmath.com/fourier/fourier3/gibbs.html

JR

 

[buschfsu]

yes!!! how does that translate to the quality of the circuit audiowise?
thanks

 

[JohnRoberts]

[quote author="buschfsu"]yes!!! how does that translate to the quality of the circuit audiowise?
thanks[/quote]

It's actually what a square wave looks like properly stripped of all harmonics above the LPF. It is arguably more correct, than that same square wave run through an analog filter, but we are not as practiced listening with our eyes.

I suspect the practical difference is in the analog filter some upper harmonics that aren't removed are phase shifted, while the digital "Gibb's" version isn't.

JR

 

[Larrchild]

One shortcoming of Fourier series today known as the Gibbs phenomenon was first observed by H. Wilbraham in 1848 and then analyzed in detail by Josiah W. Gibbs (1839-1903). We will start with an example.

Later, the Gibbs Phenomenon, would move to America and come to dominate American radio and Discoteques in the 1970's.

 

[NewYorkDave]

[quote author="buschfsu"]when i put a square wave into it it had batman heads on the horizontal sections of the square waves. [/quote]

Did it look like this?

You must have had the Bat-pass filter engaged. Don't worry, it's a common newbie mistake.

 

[Mbira]

:green:

hmmm....looks like they're out of phase too.

 

[Larrchild]

hmmm....looks like they're out of phase too.

The tight outfits in the 60's series made me think that also.

 

[CJ]

Thanks for the laughs at least.

Don't forget B H curves and the triangle wave for checking when an amp clips, top or bottom.
Has anybody seen Larry's XFMR?

It's huge! :razz: