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Cable Asylum Interconnects, speaker wire, power cords. Ask the Cable Guys. |
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Cable Asylum Interconnects, speaker wire, power cords. Ask the Cable Guys. |
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In Reply to: Measurements performed by a friend. posted by Al Sekela on April 12, 2006 at 13:33:25:
I've seen this used to test long lines, you return a "blip" wherever there is an impedence mismatch... so sya you have a two mile run of communications wire, you originate a pulse and then watch the echos, you should only get one echo at the termination, if there are other minor blips returning before the end blip you may have cable flaws.... it's pretty much a clear demonstration of termination and cable length effects...here's a jave applet so you can play with this concept:
http://www.eecircle.com/applets/018/TDR.html
Anyway.... the ONLY way TDR could work is that conductive materials are subject to internal reflections... the practical issue is that audio cables are too short for most testing arrangments...
I think that the TDR phenomena clearly show that energy reflections between impedence shifts (termination, solder joints) are a real phenomenon that few manufacturers confront directly, except perhaps MIT and Transparent...
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Follow Ups
- Time Domain Reflectometry ? - tonemaniac 06:36:48 04/13/06 (5)
- Which does not even take into account.... - tonemaniac 08:28:44 04/13/06 (2)
- That is a very interesting idea, thanks... - Al Sekela 14:07:37 04/13/06 (1)
- I think this is why my carbon fiber ICs have such good low level resolution - tonemaniac 15:27:09 04/13/06 (0)
- No, I believe it was an HP network analyzer. - Al Sekela 07:13:21 04/13/06 (1)
- It doesn't matter - jneutron 17:33:08 04/13/06 (0)
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