Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Patent
1997-07-16
2000-03-14
Ballato, Josie
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
324533, G01R 3108
Patent
active
060377801
ABSTRACT:
The object of the present invention is to offer a transmission line propagation delay time measuring device capable of reducing the measurement errors due to attenuation in transmission lines and allowing precise measurement of the transmission line propagation delay time. The invention comprises a test signal generating circuit 1 for generating a test signal for measuring the propagation delay time in a transmission line 3, a transmission line 3 having one end connected to the test signal generating circuit 1 via a measurement point at which the propagation delay time is measured and the other end open, a timing measuring circuit 5 for measuring the time required for the voltage at the measurement point 2 to reach a predetermined value, a data table 7 for storing transmission line attenuation values and measurement errors obtained by simulating the transmission line delay time measuring device as corrective data, and a computing circuit 6 for performing a propagation delay time corrective procedure by calculating a propagation delay time based on measurement values measured in the timing measuring circuit 5 and referring to the data table 7.
REFERENCES:
patent: 3648080 (1972-03-01), Nakaya
patent: 5420512 (1995-05-01), Spillane
Ando Electric Co., Ltd
Ballato Josie
Kobert Russell M.
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