FreeLists / si-list / [SI-LIST] Re: Impedance measurement using TDR

["Daniel, Erik S., Ph.D." <Daniel.Erik@xxxxxxxx>]

Steve-

> You are also correct in that the best 
> picture of what a trace will look like to your circuit is a 
> measurement taken at the risetime your circuit will be seeing 
> in practice.  Since the risetime of a TDR step cannot be 
> easily varied, we encourage our customers to filter their TDR 
> measurements to the risetime in which they are interested.  

We have often used relatively inexpensive commercial risetime filters (e.g.
from PSPL or Agilent) on the TDR outputs of our scopes to simulate the
longer risetimes that are present in many systems.  This seems to work well.

                                        - Erik

==================================================================
Erik Daniel, Ph.D.                   Voice:  (507) 538-5461      
Mayo Foundation                      Fax:    (507) 284-9171
200 First Street SW                  E-mail: daniel.erik@xxxxxxxx
Rochester, MN  55905                 Web:    www.mayo.edu/sppdg/
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