Apparatus and method for expanding the frequency range over whic

Details Apparatus and method for expanding the frequency range over whic Apparatus and method for expanding the frequency range over whic

1989-05-10

1990-12-18

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Testing potential in specific environment

Voltage probe

324149, G01R 102, G01R 3100

Patent

active

049789074

ABSTRACT:
It has been found that the ground lead of a measurement instrument probe has an inductance which, when coupled with the capacitance of the rest of the probe, forms a resonant circuit. The net result is a peak in the frequency response of the probe which interferes with accurate amplitude measurements of test signals having a frequency above some threshold. Pursuant to the present invention, a resistor is added to the measurement instrument probe whose value substantially flattens the frequency response of the probe and permits accurate amplitude measurements over a substantially greater frequency range. This resistor, either having a fixed or adjustable value, can be added to the measurement instrument probe or can be included in an adjunct which fits over a probe end.

REFERENCES:
patent: 2883619 (1959-04-01), Kobbe et al.
patent: 3532982 (1970-10-01), Zeidlhack et al.
patent: 3612999 (1971-10-01), Bergero
patent: 4418314 (1983-11-01), Nieto, Jr.

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