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Article #964

Re: An unusual Oscilloscope phenomenon

#964
From: David L. Jones
Date: Sat, 27 Jun 2009 02:25
43 lines
2904 bytes
The Phantom wrote:
> On Fri, 26 Jun 2009 13:41:07 +1000, "David L. Jones"
> <altzone@gmail.com> wrote:
>
>
>>
>> It's not only about waveforms-per-second, it's also about the
>> capture and display engine as well.
>> The manufactuers have various technologies (e.g. Tek Digital
>> Phosphor) to make their digital scopes have an "analog type" display
>> and response, and they work superbly. In fact they can be better
>> than analog in many respects. But that performance costs money, so
>> you have to start paying around say the $5K mark before you get a
>> digital scope that really performs like an analog one in terms of
>> variable display intensity, response time, and capture dead-time.
>> See here for more info:
>> http://www.tek.com/products/oscilloscopes/dpo_technology/
>> http://www.tek.com/Measurement/App_Notes/Technical_Briefs/55-13757/eng/55w-13757-0.pdf
>>
>> Lower end scopes don't have these "analog like" display
>> technologies, so then "waveforms-per-second" is pretty much the
>> basic benchmark. Modern scopes are pretty darn good though, and even
>> the low end cheap ones are streets ahead of previous generation
>> DSO's.
>> Those who haven't used a modern high end digital scope don't know
>> how superb they can really be.
>>
>> With modern fast real-time deep memory scopes, aliasing is pretty
>> much a thing of the past.
>
> Is that an Agilent 6000 series scope I see in front of you?

It is indeed.
In fact, it's that exact same setup where I first found this issue, 
debugging that actual design as you see there, probably only days before or 
after that photo was taken.

Dave.

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From: "David L. Jones" <altzone@gmail.com>
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Date: Sat, 27 Jun 2009 12:25:14 +1000