Low frequency suppression circuit for a time domain reflectomete

Details Low frequency suppression circuit for a time domain reflectomete Low frequency suppression circuit for a time domain reflectomete

1998-02-27

2000-09-26

Ballato, Josie

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Distributive type parameters

324644, 324534, G01R 2704

Patent

active

061247170

ABSTRACT:
An improved time domain reflectometer (TDR) includes a capacitor coupled in series between a transmission medium under test and the TDR receiver input. A switch, operating under microprocessor control, selectively couples and uncouples the capacitor to a voltage reference, such as ground. During the generation of interrogating pulses from the TDR and the acquisition of data from the transmission medium under test, the capacitor is uncoupled from the voltage reference and acts as a DC blocking capacitor. During periods of non-TDR activity, the capacitor is coupled to voltage reference and acts as a load for low frequency interference appearing on the transmission medium. The capacitor-switch operation blocks low frequency interference signals from the receiver input of the TDR.

REFERENCES:
patent: 5117123 (1992-05-01), Sendelweek
patent: 5726578 (1998-03-01), Hook

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