Apparatus and method for determining the voltage breakdown and c

Details Apparatus and method for determining the voltage breakdown and c Apparatus and method for determining the voltage breakdown and c

1991-08-01

1993-03-23

Harvey, Jack B.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324693, 324705, 324450, G01R 2714

Patent

active

051968037

ABSTRACT:
An apparatus and method for determining both the breakdown voltage and the conductivity of a particulate material, such as a developer material, is provided. In a preferred embodiment, the apparatus for determining breakdown voltage comprises a breakdown cell for storing a preselected quantity of the particulate material and a voltage breakdown ("VB") autometer, the VB autometer being adapted to apply a first voltage across at least portions of the preselected quantity of the particulate material. The VB autometer is capable of progressively varying the magnitude of the first voltage. A measuring circuit, for measuring a second voltage, is coupled to the voltage breakdown cell. When the second voltage substantially equals a preselected reference voltage, the first voltage substantially equals the breakdown voltage of the particulate material.

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patent: 4656832 (1987-04-01), Yukihisa et al.
patent: 4839581 (1989-06-01), Peterson, Jr.

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