Printable View
I was wondering if anyone knows how some of the handheld testing devices, like the (Fluke NetTool or now, the Linkrunner series http://www.flukenetworks.com/enterpr...rk-Auto-Tester ) test cable length? On the older NetTool device, I find the measurement helpful, but not extremely accurate. For instance, on a 14.1 feet, I get a measurement of 16 feet with the NetTool. This is close enough for me, to help figure out where old wiring on a 36 acre facility goes. Just wondering how they do it.
Google 'Time Domain Reflectometer'
Are you saying the length of the cable from one end of the sheath to the other is 14.1 feet ?Quote:
Originally Posted by ScaleRobotics
If so the 16 feet measurement could well be correct as the cable is twisted therefore longer. also each pair has a different twist ratio therefore each pair will yeild a different results.
Take two peices of single wire each 10 feet long, tie one end to a chair, put the other in the chuck of a cordless drill and twist it up. then see how long the resultant twisted pair is, it certainly wont be 10 feet. :)