Importance

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Abstract

A calibration system for automatic test equipment for testing electronic circuits includes a cable (68) of a predetermined length connected to a common mode (74). A switch (66) connects the input of the cable to a test terminal (56) and (48). Each of the test terminals in the system is connected through a similar cable to the common node (74). A transmitter (46) and a receiver (48) are disposed at each terminal in the system and are activated at a single time to provide a incident clock edge into the terminal and to receive a reflected clock edge from the common node (74). By measuring the delay between incident and reflected clock edges for all of the terminals and comparing it with the expected delay, a relative error can be generated and a correction made. Another iteration can be repeated if necessary and a correction effected until the system is calibrated.

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First Claim