[sdiy] Measuring filter response

[Dave Manley]

Years ago, a college lab I had did what you describe.  It works.

In the good old days, we would hang a polaroid camera on the front of
a tektronix green eye scope.  tek sold this as an accessory.

http://www.recycledgoods.com/images/41053_1.jpg

Pretty primitive, eh?

A digital camera on a tripod in 'Bulb' or 'time exposure' mode could
do the trick if you don't have a storage scope.

-Dave


 On Mon 11/08/15 12:55 PM , "Harry Bissell" harrybissell at wowway.com sent:
> If you don't use a storage scope its pretty tough to view lower
> frequencies...
> H^) harry
> 
> ----- Original Message -----
> From: David G Dixon <dixon at mail.
> ubc.ca>To: 'Neil Johnson' <n
> eil.johnson97 at ntlworld.com>, s
> ynth-diy at dropmix.xs4all.nlSent: Mon, 15 Aug 2011 15:45:30 -0400 (EDT)
> Subject: Re: [sdiy] Measuring filter response
> 
> I once read in an old textbook (pre-computer, pre-digital scope) about
> usinga slow sawtooth to ramp the filter frequency, and also using this saw
> totrigger the scope, then just feeding a sine to the filter and looking at
> theresponse.  Has anybody tried that?
> 
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> -- 
> Harry Bissell & Nora Abdullah 4eva
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