On Jul 21, 2007, at 12:44 PM, Arkady wrote:

> Well I think it's close to what were my initial thoughts, but how  
> it can be
> done practically?

For a TDR to work correctly you have to know the velocity factor of  
the cable you're measuring (at least that's what we have to do with  
RF cabling).

Our radio club owns a TDR, and it only cost about $200, virtually  
new... the only thing not working correctly on it is the little  
thermal paper printer for printouts of the screen, which we don't  
care about much anyway.

But you do need some practice with it, with some known cable lengths  
to see/learn how to run it.

Other than the practice sessions, it's a piece of cake to find opens/ 
shorts in RF co-ax cabling with the thing... once you have it set  
correctly for your cable's RF velocity factor.  I assume it'd work  
fairly well on open single wire circuits also, if connected correctly.

--
Nate Duehr
nate@natetech.com



-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist