Abstract
The first part of this paper describes an explorative circuit system functioning as a highly stabilized and sensitive reactance meter with a wide range of application in various fields of scientific research and industrial operation. With a measuring range of 10-3 to 10+6 pF, it has a sensitivity of 7.6 μA/0.001 pF when measured through an ammeter with a full scale of 100 μA, and a stability of less than 1 μA in terms of zero drift lasting several hours.
The latter part treats the cases where the reactance meter is utilized in measuring the surface fluctuation of the grindstone for a tool grinding machine. For that purpose the surface fluctuation is converted into the change of capacitance by varying the separation of parallel-plate condensers. This non-contact method enables measurements of surface fluctuation to less than several microns. The static and dynamic characteristics of surface fluctuation being investigated through the reactance meter, their differences as well as the optimum measuring conditions are confirmed therewith.
