Method of adjusting a temperature compensating resistor while it is in a circuit

• Main Author: MERRICK; EDWIN B
• Format: Patent
• Language: English
• Published: 15.04.1986
• Edition: 4
• Subjects: ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; BASIC ELECTRIC ELEMENTS; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MEASURING; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; PHYSICS; RESISTORS; TARIFF METERING APPARATUS; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TESTING

A method of providing a temperature compensating resistor having a desired ohmic change with temperature comprising the steps of connecting a resistor RT that is made of material having a high temperature coefficient in parallel with a resistor RS that is made of material having a lower temperature coefficient, connecting the parallel combination in a circuit and increasing the value of RS by cutting it with a laser until the circuit indicates that the desired result is obtained.