Hi Louis,

Good TDR instruments (Agilent or Tektronix) can measure the impedance of 
trace lengths of 2.5 - 3.5 cm.  You should use a rise time of 50 ps or 
less to get good resolution.


Regards
Ravinder Ajmani
HGST, a Western Digital company
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5601 Great Oaks Pkwy. 
San Jose, CA 95119-1003
www.hgst.com




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[TN] Controlled Impedance measurements






Technetters, I am trying to measure the impedance of some traces on a 
printed circuit board, traces that are 2.5 cm - 3.5 cm in length. They are 
too short for the TDR here to measure. Could a Vector Network Analyzer 
make impedance measurements on traces that short? If so, does anyone know 
of a lab that could make such measurements?

Louis Hart
Compunetics
Monroeville, PA
USA
[log in to unmask]<mailto:[log in to unmask]>
412-858-1232


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