User Manual

฀ ฀
฀ Discovering฀Cabling฀Characteristics฀฀ ฀
45฀
avv51.bmp฀ avv52.bmp฀
Reflection฀from฀a฀short.฀฀
Shorts฀and฀other฀decreases฀in฀impedance฀cause฀negative฀
spikes฀on฀the฀trace.฀
Reflection฀from฀a฀section฀of฀cable฀with฀the฀wrong฀impedance฀
(followed฀by฀the฀end฀of฀the฀cable).฀฀
The฀small฀positive฀spike฀at฀the฀start฀of฀the฀section฀indicates฀
higher฀impedance฀than฀the฀rest฀of฀the฀cable.฀The฀negative฀
spike฀is฀the฀end฀of฀the฀section,฀where฀the฀impedance฀drops฀to฀
the฀correct฀value.฀
Figure฀17.฀TDR฀Plots฀for฀Coaxial฀Cabling฀(cont.)฀