Circuit arrangement comprising a multi-wire line for supplying current and emitting signals

US7456635B2 · kind B2 · utility

Assignee

• MAS Auer GmbH · DE

Inventors

• Petrus Akkerman · Berlin, DE
• Andreas Lemke · Berlin, DE
• Ingmar Bönig · Berlin, DE

Key dates

• Filing date: Jul 20, 2004
• Grant date: Nov 25, 2008
• Expiry date: Jul 20, 2024

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D3/08
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A circuit arrangement with a multi-wire line for supplying current to a sensor and for emitting a signal that corresponds to a measured value to an evaluation module via a signal line. To eliminate measuring errors caused by short circuits, first and second resistors, with the second resistor provided with a current tap, and a transistor, which is connected to a clock-pulse generator that bridges the first resistor in a clocked manner, are connected in series to the signal emission line. A comparator for comparing the values obtained via the resistors in the successive switching positions of the transistor and for emitting a short-circuit error message to the evaluation module, if the measured values differ in the successive clock pulses, is connected downstream of the resistors.