[time-nuts] Chinese Scopes

Don Latham djl at montana.com
Tue Apr 17 22:35:12 UTC 2012


Timestamp is good, but ping-pong circular buffers let you look at
precoursers to the trigger event if any, and loads one buffer at a time
to mass storage with accompanying metadata, including the timestamp.

Jim Lux
> On 4/17/12 7:55 AM, John Lofgren wrote:
>> One feature of the Agilent and Rohde scopes (maybe Tek, too?) that can
>> help in some situations is segmented memory.  It allows you to capture
>> periodic or random events with the full sample rate but to ignore all
>> the dead time between events.  For each trigger it stores one sweep
>> with a time stamp.  When you want to look at the record you can roll
>> back through memory and look at each individual event with full
>> resolution.
>>
>> This isn't a cure-all because the time stamps will have limited
>> resolution and some amount of jitter, but it can be helpful in some
>> applications.  It also assumes that you know what you're looking for
>> and can trigger on it :)
>>
>
>
> Yes, this was a tek..it does the same thing (called "fast frame" in
> their manual) and the trigger time stamps were actually high resolution
> (higher than the sample rate).
>
>
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-- 
"Neither the voice of authority nor the weight of reason and argument
are as significant as experiment, for thence comes quiet to the mind."
R. Bacon
"If you don't know what it is, don't poke it."
Ghost in the Shell


Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com





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