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TDR measurement question (Read 3574 times)

jefkat

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Posts: 69

TDR measurement question
Sep 11^th, 2007, 3:42am

Hi,
I am doing TDR measurements on a board (with components along the path on which TDR is being done). TDR on just a line is simple but it becomes a bit tricky, I think when you have components along the way. The question becomes: what velocity factor do you take for these devices? These are various passives like a transformer etc etc. So how would these be taken into account.
Any clues?
Thanks much
shaf

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neoflash

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Posts: 397

Re: TDR measurement question
Reply #1 - Feb 18^th, 2008, 5:13am

jefkat wrote on Sep 11^th, 2007, 3:42am:

Hi,
� �I am doing TDR measurements on a board (with components along the path on which TDR is being done). TDR on just a line is simple but it becomes a bit tricky, I think when you have components along the way. The question becomes: what velocity factor do you take for these devices? These are various passives �like a transformer etc etc. So how would these be taken into account.
Any clues?
Thanks much
shaf

I think if u have issue locating each component along the signal transmission, you can push the componenet slightly and you can see somewhere along the TDR waveform will change. That's where ur component is on the waveform.

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