Re: An unusual Oscilloscope phenomenon

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#957

From: Phil Allison
Date: Fri, 26 Jun 2009 02:24

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"Steve Sousa"
> "David L. Jones"
> Since you're into it, why don't you compare the refresh rate of digital vs 
> analog scopes?

**  Be like comparing chalk with cheese.

> Also known as the waveforms-per-second capability?


**  Pretty meaningles with analogue scopes that show the input signal 
continuously.


> It's something i'm very curious about in practice,

** Digital scopes  SAMPLE  the signal, both in amplitude and time -  then 
show you one screen's worth of SAMPLEs.

 Bit later they show you another one.

 Bit like tasing a pot of stew with your little finger.


> and also, do the digitals behave as the analogs (like a low-pass filter) 
> when you increase the freq of a wave-form or suddenly start aliasing?

** The topic of  " aliens "  with DSOs is verboten among makers and fanatics 
alike.

Plain fact is that you do not get to see what is actually coming down the 
probe cable and you may well see stuff that is not there at all.

Bit of a worry,  really.


.....   Phil

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From: "Phil Allison" <phil_a@tpg.com.au>
Newsgroups: sci.electronics.design,aus.electronics
Subject: Re: An unusual Oscilloscope phenomenon
Date: Fri, 26 Jun 2009 12:24:16 +1000
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