Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1998-12-04
2000-05-09
Ballato, Josie
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324671, 324678, G01R 2726
Patent
active
060608900
ABSTRACT:
Apparatus for measuring the length of a transmission cable carrying primary and inverted multilevel transmission signals. A counter is arranged to count timing signals from the beginning of the measuring process while a filter extracts a high frequency signal component from the primary and inverted multilevel transmission signals. The extracted high frequency signal component is used to charge a capacitor. A comparator compares the level of charge of the capacitor to a reference level and issues a stop counting signal to the counter when charge of the capacitor equals the reference level. The count of the timing signals in the counter when counting halts is proportional to cable length.
REFERENCES:
patent: 3530379 (1970-09-01), Demerliac
patent: 3857092 (1974-12-01), Meyer
patent: 3986108 (1976-10-01), Thomas
Advanced Micro Devices , Inc.
Ballato Josie
Nguyen Vincent Q.
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