Solid-state high input impedance meter system

Abstract

Abstract SYSTEMS OF THIS TYPE BE PREDICTABLY ACCURRATE AND OPERATIVE, THE SYSTEM ALSO INCLUDES A HIGH VOLTAGE PORTABLE TEST UNIT TO TEST THE VOLTMETER AND PROBES. TO INSURE COMPLETE RELIABILITY OF VALUES BEING MEASURED, THE HIGH VOLTAGE PORTABLE TEST SOURCE ITSELF IS SUBJECT TO TEST TO DETERMINE THAT IT IS OPERATING PROPERLY BEFOR IT IS USED TO TEST THE VOLTMETER AND PROBES, AND FOR THIS PURPOSE A HIGH VOLTAGE MEGOHMMETER INSULATION LEAKAGE CURRENT-EMISSION DETECTOR IS PROVIDED TO TEST THE HIGH VOLTAGE PORTABLE TEST VOLTAGE SOURCE, AND TO MEASURE THE HIGH VOLTAGE INSULATION ASSOCIATED WITH THE HIGH VOLTAGE POINT OR TERMINAL BEING MEASURED. INASMUCH AS THE HIGH INPUT IMPEDANCE METERING SYSTEM IS USED IN CONJUNCTION WITH HIGH VOLTAGES, A COLLAPSIBLE AND DETACHABLE INSULATING "HOT STICK" IS PROVIDED TO ISOLATE THE HIGH VOLTAGE COMPONENTS FROM HUMAN CONTACT WHILE IN USE. PRESENTED IS A SYSTEM, INCLUDING APPARATUS AND METHODS OF OPERATION THEREOF, FOR EFFECTING ISOLATED MEASUREMENT AND SENSING OF LINE TO GROUND VOLTAGES, DIFFERENTIAL VOLTAGES, CURRENTS, INSULATION LEAKAGE AND RESISTANCES, CORONA LEVELS, AND OTHER PARAMETERS IN INSULATED CONDUCTORS AND RELATED SYSTEMS ASSOCIATED WITH LOW AND HIGH POWER, LOW AND HIGH VOLTAGE ELECTRICAL AND ELECTRONIC SYSTEMS. THE SYSTEM INCLUDES A HIGH INPUT IMPEDANCE METER UNIT ACTUATED BY A SOLID-STATE AMPLIFIER CIRCUIT INCLUDING A PAIR OF FEEDBACK CIRCUITS THAT COOPERATE WITH TRANSISTOR AMPLIFIERS TO MAINTAIN SUBSTANTIALLY CONSTANT THE RATIO OF INPUT AND OUTPUT FROM THE CIRCUIT OVER A WIDE RANGE OF AC AND DC VOLTAGES AND CURRENTS. IN ITS DIFFERENT APPLICATIONS, THE HIGH INPUT IMPEDANCE METER INCLUDING SOLID-STATE AMPLIFIER CIRCUIT IS USED IN CONJUNCTION WITH A VARIETY OF PROBES, BOTH LOW VOLTAGE AND HIGH VOLTAGE TYPES, FOR MEASUREMENTS OF VARIOUS VOLTAGES, AND MAY BE UTILIZED WITH A PROXIMITY PROBE FOR DIRECT SENSING OF AC FIELDS. THE HIGH INPUT IMPEDANCE OF THE METER MOVEMENT AND SOLID-STATE CIRCUIT ALSO PERMITS THE USE OF CORONA VOLTAGE LEVEL AND DETECTING PROBES FOR BOTH HIGH VOLTAGE DIRECT AND LOW VOLTAGE INDIRECT OR PROXIMITY MEASUREMENT OF VARIOUS LEVELS OF VOLTAGES. INASMUCH AS IT IS IMPORTANT THAT

Inventors

• 👤 H Ross

Bibliographic Details