[SI-LIST] Re: TDR with single event trigger
- From: Peter.Pupalaikis@xxxxxxxxxxxxxxxxxx
- To: SI-List <si-list@xxxxxxxxxxxxx>
- Date: Thu, 1 May 2014 09:24:50 -0400
Hi Jinhua:
Most TDR instruments consist of a high speed pulser (step generator) and an
equivalent time sampler. The equivalent time sampler is sampling in a range
of 40KS/s to 150KS/s, repeatedly triggering on the TDR incident edge and
building up an equivalent time record. Even if you could get the trigger
system to trigger on a bump or wiggle indicative of the location you refer
to, you'd have to get really lucky to even get one point of the waveform at
that location - in general, you would miss the event.
What you need is to use a real-time oscilloscope in conjunction with a
high-speed pulser. You can use the pulser from the TDR instrument in
conjunction with a power splitter and connect the real-time scope to one
portof the splitter. The problems you will then encounter is that you might
need a very high-bandwidth real-time scope and if you use a real-time scope
with bandwidths commensurate with your TDR system, it will be expensive.
Also, you will need to contrive a trigger capable of triggering on your
eventof interest.
In thinking about this, you might want to trigger on the actual striking of
the device (using an accelerometer or something) and take repeated
acquisitions of the TDR after the strike. On LeCroy scopes, this would be a
sequence mode acquisition (i.e. many waveforms generated from repeated TDR
edges), but "qualified" by the signal detecting the strike.
I hope this information helps,
Pete
"Jinhua Chen" ---05/01/2014 08:55:20 AM---Hi, experts I am
troubleshooting an interconnect issue. The symptom is intermittent open when
mechan
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From:
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"Jinhua Chen" <dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender
"jhchen0710@xxxxxxxxx" for DMARC) [IMG]
To:
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SI-List <si-list@xxxxxxxxxxxxx>, [IMG]
Date:
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05/01/2014 08:55 AM [IMG]
Subject:
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[SI-LIST] TDR with single event trigger [IMG]
Sent by:
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Hi, experts
I am troubleshooting an interconnect issue. The symptom is intermittent open
when mechanical force is applied (hit by a stick etc.). TDR is a good tool
topin point the exact location of open. But this intermittent issue only
lastfor micro seconds. TDR today has continuous trigger. It can't catch the
single event. Does any one know how to trigger TDR with single event? Or any
other tools to pin point the physical location of intermittent open?
Thanks!
Jinhua
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