Apparatus for measuring the length of an electrical line
AssigneeTeradyne, Inc.
InventorsJiann-Neng Chen, Stephen A. Cohen
Life of this patent
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Abstract
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.
Claims28
Apparatus for precisely and quickly measuring the length of a line under test to an electrical discontinuity of said line, said apparatus comprising
- an edge generator for providing an edge to one end of said line,
- a reflection detector for detecting the edge reflection returning from said discontinuity to said one end and triggering said edge generator to provide an edge at a fixed time after detecting said edge reflection so as to cause said edge generator to repeatedly provide said edges at a frequency related to the propagation delay in said length of line, and
- a frequency measurer connected to measure said frequency.
A method of precisely and quickly measuring the length of a line under test to an electrical discontinuity of said line, said method comprising
- providing an edge to one end of said line by an edge generator,
- detecting the edge reflection returning from said discontinuity to said one end,
- triggering said edge generator to provide an edge at a fixed time after detecting said edge reflection so as to cause said edge generator to repeatedly provide said edges at a frequency related to the propagation delay in said length of line, and
- measuring said frequency.
Dependencies are inferred from the claim text.