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ELIMINATING WEIGHING ERROR CAUSED BY ELECTROSTATIC ATTRACTION

IP.com Disclosure Number: IPCOM000022897D
Original Publication Date: 1976-Apr-30
Included in the Prior Art Database: 2004-Mar-27

Publishing Venue

Xerox Disclosure Journal

Abstract

In carrying out experimental xerographic work, weight measurements in the order 1/1000 of a gram may be made of experimental samples of powder (such as toner) , thin films, or even paper, The samples being weighed are often electrically charged. The charge on the samples can cause an electrical attraction between the sample and various parts of the balance used for weighing the sample. This electrical force is substantial in relation to the sample weight and can result in erroneous data. This error can be eliminated by placing the sample in a conductive container during weighing0 The conductive weighing container captures the electric field from the sample, and the field can not act on any surface external to the container. When the container is placed on the balance, it contacts the metal parts of the balance. Thus, no electric field exists between the container or its contents and the balance parts.