[SI-LIST] Re: TDR with single event trigger
- From: "Jinhua Chen" <dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender "jhchen0710@xxxxxxxxx" for DMARC)
- To: jeff.loyer@xxxxxxxxx
- Date: Thu, 1 May 2014 23:10:58 +0800
Jeff
Good idea. Besides, your approach is easy to set up because it doesn't need
extra equipments. I will use the persistent mode to catch. Somehow, your link
below doesn't work. Can you send me the waveform screen shots?
Pete's approach is quite different. I do have a realtime scope with 13 Ghz
bandwidth and 20 Gs/S. The sample rate might be low if I want to have pico
second resolution. But it worths a try.
Thanks for all the valuable suggestions.
Jinhua
On May 1, 2014, at 10:20 PM, "Loyer, Jeff" <jeff.loyer@xxxxxxxxx> wrote:
> The way I've dealt with this issue was to develop the "TDR Tug Test" (TTT for
> short :)). The key is to put the TDR in infinite persistence mode while you
> tug (or beat) on the offending hardware. You'll capture the TDR waveform
> jumping at the open even though it happens very quickly.
> Sample waveforms are available at the link below. Note that in this case I
> daisy-chained the various pins through a connector so the exact open location
> varied, but you should get the idea. I also had the TDT waveform captured,
> but that's not essential.
> https://www.filesanywhere.com/fs/v.aspx?v‹6d638a616470759c9e
>
> Have fun,
> Jeff Loyer
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
> Behalf Of Jinhua Chen
> Sent: Thursday, May 01, 2014 5:54 AM
> To: SI-List
> Subject: [SI-LIST] TDR with single event trigger
>
> 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 to
> pin point the exact location of open. But this intermittent issue only last
> for 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 Chen------------------------------------------------------------------
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