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Article #930

Re: An unusual Oscilloscope phenomenon

#930
From: Nico Coesel
Date: Fri, 26 Jun 2009 19:49
37 lines
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"Steve Sousa" <etsteve@yahoo.com> wrote:

>
>
>"David L. Jones" <altzone@gmail.com> wrote in message 
>news:h8B0m.53620$FI5.3564@newsfe12.iad...
>> Check out a rather unusual phenomenon you can see on your oscilloscope in 
>> my latest blog (#14):
>> http://www.alternatezone.com/eevblog/
>> See if you can get it to happen on your scope!
>>
>
>Hello:
>
>Since you're into it, why don't you compare the refresh rate of digital vs 
>analog scopes?
>Also known as the waveforms-per-second capability? It's something i'm very 
>curious about in practice, and also, do the digitals behave as the analogs 

The waveforms-per-second depends on the sample rate, the length of the
acquisition memory and the throughput of the display system. Another
thing that limits the refreshrate is the refreshrate of the display.
The latter can be circumvented by adding several swaps into one
signal.

>(like a low-pass filter) when you increase the freq of a wave-form or 
>suddenly start aliasing?

That depends on the samplerate and the bandwidth. If the samplerate is
lower then the maximum bandwidth expect aliasing effects unless it is
a sampling oscilloscope.

-- 
Failure does not prove something is impossible, failure simply
indicates you are not using the right tools...
                     "If it doesn't fit, use a bigger hammer!"
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From: nico@puntnl.niks (Nico Coesel)
Newsgroups: sci.electronics.design,aus.electronics
Subject: Re: An unusual Oscilloscope phenomenon
Date: Fri, 26 Jun 2009 19:49:41 GMT
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