Importance

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Abstract

A multi-potential guarding technique for preventing electrical charge exchange to or from an electrical system containing potential gradients and sources of electrical noise. An inner electrically conductive guard shield surrounds the system to be guarded. The electrical potential of the inner electrically conductive guard shield is such that there is ideally no net current flow to the guard shield from the electrical system therewithin. An outer electrically conductive guard shield surrounds the inner electrically conductive guard shield. An operational amplifier drives the outer electrically conductive guard shield to an electrical potential that is substantially equal to that of the inner electrically conductive guard shield so that there is substantially no potential difference between the inner and outer guard shields which has the effect of producing a high insulation impedance around the guarded system. The multi-potential guarding technique of this invention has application in a gradient-guard configuration and a charge-channel configuration.

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First Claim