[SI-LIST] Re: Q on TDR coupon measurements

ah ... now we know where the term "averaging mean" method comes from.  
Averaging refers to placing the TDR instrument into averaging mode.  
Mean refers to the segment of the TDR waveform over which the mean is 
measured.

This method is reasonable, considering that most TDR coupon launches are 
terrible, and attempts to remove the launch artifacts from the 
measurement result.  But, it is incorrect, and does not provide a 
measure of the actual impedance of the PCB trace.


Scott McMorrow
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
(401) 284-1827 Business
(401) 284-1840 Fax

http://www.teraspeed.com

Teraspeed® is the registered service mark of
Teraspeed Consulting Group LLC



Loyer, Jeff wrote:
> One source for this kind of information:
>
> http://www.intel.com/design/chipsets/applnots/29817901.pdf=20
>
> It's pretty old, though - much has been learned since 2000...
>
> Jeff Loyer
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of Ivor Bowden
> Sent: Thursday, March 23, 2006 5:07 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: Q on TDR coupon measurements
>
> I've been enjoying the discussion on TDR measurements. While I
> understand the principle, I don't have experience with them beside
> evaluating TDR printouts.
>
> I was wondering if anyone knows a web site or other resource that has a
> variety of example waveforms and their proper interpretations? Including
> touching on some of the details Scott and Eric mention.
>
> tia,
>
> Ivor Bowden
> Curtiss-Wright Controls Embedded Computing
>
>
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