Method of and apparatus for the measurement of slowly changing o

Details Method of and apparatus for the measurement of slowly changing o Method of and apparatus for the measurement of slowly changing o

1988-02-16

1989-08-15

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Testing potential in specific environment

Voltage probe

324133, G01R 1914

Patent

active

048578320

ABSTRACT:
The measurement of slowly changing or static electric potential or dielectric polarization is effected by an input circuit which comprises a pair of diodes a pair of resistors and a pair of switches. The diodes are connected in reverse parallel between an input terminal and a pair of output terminals. The circuit detects when the potential rises above a first voltage level, changes the input impedance thereof from high to low, detects when the potential has fallen below a second voltage level, and changes the input impedance back to high. Summation means is provided for summing the above changes in input impedance from which a determination can be made as to whether the potential is steady, increasing or decreasing. The switches are preferably Schmitt triggers having a hysteresis which represents the two reference voltages.

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