Arrangement for measuring temperatures

US3943434A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Jochen Haeusler · Nuremberg, DE
• Roland Horn
• Werner Kirschner

Key dates

• Filing date: Feb 6, 1974
• Grant date: Mar 9, 1976
• Expiry date: Feb 6, 1994

Classification

• Technology area (CPC G): Physics
• CPC primary: G01K7/21
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An improved arrangement for measuring temperatures in which a bridge containing two temperature dependent resistances is used. A first branch of the bridge consists of a parallel connection of two series circuits each consisting of a constant resistance and a temperature-dependent resistance and a second branch of the bridge consists of a series circuit of two constant resistances. Means are provided to impress a constant current on the first bridge branch so that the current divides between the two constant resistances at the input and flows out between the two temperature dependent resistances. At the second bridge branch, a voltage corresponding to the voltage generated in the first bridge branch is impressed. A junction of the second bridge branch is at the same potential as the current sink of the first bridge branch. The output for measuring a temperature proportional voltage is taken across the junction of the two constant resistances in the second bridge branch and the junction between one constant and one temperature dependent resistance in the first bridge branch.