Re: 'scope terminology
From: Walter Harley (walterh_at_cafewalterNOSPAM.com)
Date: 07/06/04
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Date: 6 Jul 2004 00:21:03 GMT
"Adam Stouffer" <adam_stouffer@hotmail.com> wrote in message
news:yEiGc.21283$6e7.11228@nwrddc03.gnilink.net...
> Hello all, I'm in the process of trying to decide what type of scope to
> buy for audio work. What is the correct term to descibe analog scopes
> that display the numeric readings right on the screen? Say for example
> it will show you have a 3vPP signal and the freq is 12Khz? I know the
> digitizing scopes all do this but only a few analog models seem to.
>
> Is an old digitizing scope like a HP 54501A or 54200A overkill for doing
> audio work, or should I stick to analog? Any input appreciated.
You might need to be more specific about what you mean by "audio work."
For repairing hifi amps, any old 20MHz dual-trace scope will do fine - you
can probably find something on eBay for less than $100. Couple that with a
cheap multimeter and a frequency counter (or a calculator) and you'll be in
great shape. The cursor features you describe are nice (I use 'em on my
2465A) but not by any means necessary.
For designing very-low-distortion circuitry, in conjunction with a
distortion analyzer, a digitizing scope can allow you to average a wave over
many repetitions and thus see (repetitive) distortion buried in (random)
noise. Some will also do FFT's, so you don't need a spectrum analyzer. (Or
a sound card and computer.)
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