Apparatus for measuring the length of an electrical line
 Apparatus for precisely and quickly measuring the length of a line under test to an electrical discontinuity of the line, the apparatus including an edge generator for providing an edge to one end of the line, a reflection detector for detecting the edge reflection returning from the discontinuity to the one end and triggering the edge generator to provide an edge at a fixed time after detecting the edge reflection so as to cause the edge generator to repeatedly provide the edges at a frequency related to the propagation delay in the length of line, and a frequency measurer connected to measure the frequency. 
Teradyne, Inc.
G G
G01R G01S
inventional inventional
Jiann-Neng Stephen A.
Chen Cohen