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Re: test for transients

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In Reply to: Re: test for transients posted by john curl on July 15, 2003 at 10:03:44:

First of all, much of the IM distortion produced by a square wave will fall back on the square wave harmonics.
But the second order IM products (i.e. f₁ + f₂, f₂ - f₁) which are typically the dominant products will all be even and fall between the square wave harmonics.
A real world perfectly symmetrical square wave is rare, and I had to add a trim pot to my Heathkit square wave generator in order to make it so. Of course, by computer generating the square wave, you can do really well.
He'll be doing this in simulation so it's not a problem.
Still, the odd order harmonics will fold back on the primary signal.
The third order IM products (i.e. 2f₁ + f₂, 2f₂ + f₁, 2f₂ - f₁, 2f₁ - f₂) will. But that's why he's planning to use a subtractive process and look at the residual.
se

"Of course that's just my opinion. I could be wrong."

Follow Ups:

Re: test for transients - john curl 12:10:28 07/15/03 (6)
Cabot's work is derived from our original work on TIM. I am the person who recommended using 30KHz as a rolloff, in order to match Holman's test on the subject. Besides, it fit the measurements we made. We also standardized with a 100KHz rolloff, for extreme test conditions.
- Re: test for transients - john curl 12:12:18 07/15/03 (5)
  Sorry, SE I meant to post this to Dan.
  - Re: test for transients - Steve Eddy 12:15:50 07/15/03 (4)
    Sorry, SE I meant to post this to Dan.
    Ah, ok. That explains why it didn't make any sense. :)
    se
    
    "Of course that's just my opinion. I could be wrong."
    - Re: test for transients - Dan Banquer 12:21:10 07/15/03 (3)
      Good God; I hope J.C. isn't implying that we are interchangeable? After all your taste in ice cream is dubious at best.
      - Re: test for transients - Steve Eddy 12:28:41 07/15/03 (2)
        
        In Reply to: Re: test for transients posted by Dan Banquer on July 15, 2003 at 12:21:10:
        
        Good God; I hope J.C. isn't implying that we are interchangeable? After all your taste in ice cream is dubious at best.
        Bah! Just more yeasayer handwaving. All ice cream tastes the same and so far no one has produced a single repeatable double-blind tasting test to show otherwise! There's no need to waste your money on all those grossly overpriced exotic ice cream flavors. All you need is a cheap gallon of vanilla ice cream from WalMart!
        se
        
        "Of course that's just my opinion. I could be wrong."
        
        Re: test for transients - Dan Banquer 12:33:33 07/15/03 (1)
        
        In Reply to: Re: test for transients posted by Steve Eddy on July 15, 2003 at 12:28:41:
        
        I'll have you know that with a few of the right mods ( like adding cream and vanilla ) you can make that WalMart stuff really sing!!!
        
        Re: test for transients - Steve Eddy 12:51:14 07/15/03 (0)
        
        In Reply to: Re: test for transients posted by Dan Banquer on July 15, 2003 at 12:33:33:
        
        I'll have you know that with a few of the right mods ( like adding cream and vanilla ) you can make that WalMart stuff really sing!!!
        Hahahahaha! Touche. :)
        se
        
        "Of course that's just my opinion. I could be wrong."

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