Fluke Corporation

Arthur B Liggett

Jeffrey Sandsmark Bottman

Michael Kirita

A test instrument employs main and remote test units at respective ends of a cable under test. The units operate in an active or passive measurement mode, wherein one of the units begins as the active unit, applying test signals to the cable under test to make a set of measurements related thereto, while the other unit takes measurements based on the signals applied by the first end. Then, after a set of measurements has been completed, the units swap roles, and the original passive end becomes the active end, applying test signal stimuli, while the original active end now becomes passive, and takes a series of corresponding measurements based from the test stimuli from the active end. The measurements are thereby overlapped and accomplished from both ends of the cable, saving time.

Method and apparatus for measuring employing main and remote units

A communication line tester system and method allows for effective measurement and presentation of communication line characteristics. The communication line tester includes a transmitter, an analog-to-digital converter and a main processor. The transmitter is electrically coupled to the communication line. The analog-to-digital converter is electrically coupled to the communication line. The main processor is electrically coupled to the analog-to-digital converter. The main processor include a pseudo-random code processor configured to generate pseudo-random coded signals for transmission by the transmitter on to the communication line and to decode pseudo-random coded signals received by the main processor from the analog-to-digital converter. The main processor also includes a multiple waveform based distortion removal processor configured to remove distortion produced by non-linear operation of tester components from signals based on a plurality of signals received from the analog-to-digital converter, the distortion removal based on a plurality of coded signals generated by the pseudo-random code processor. The main processor also includes an even-order distortion removal processor, a display presentation processor, a baseline distortion removal processor, and an open/short processor.

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Snohomish, WA, United States of America

Arthur B Liggett