A 3-wire differential resistance measurement circuit

Author

Kara, Miklos T. ; Rizkalla, Maher E.

Author_Institution

Dept. of Electr. Eng., Purdue Univ., Indianapolis, IN, USA

fYear

1993

fDate

18-20 May 1993

Firstpage

505

Lastpage

508

Abstract

The authors describe two circuit techniques to measure small differences between two resistors or small changes in a transducer resistance. The resistances of the three connecting wires to the transducer are canceled by methods other than the conventional 3-lead circuits. The first method uses a pair of matched current sources. The second employs a dual-slope analog-to-digital converter with a multiplexed preamplifier. Based on the latter method, a 3 1/2-digit, 0.1 °C resolution, 3-lead platinum thermometer was built successfully

Keywords

analogue-digital conversion; bridge circuits; electric resistance measurement; multiplexing; multiplexing equipment; platinum; resistance thermometers; Pt thermometer; bridge; differential resistance measurement circuit; dual-slope analog-to-digital converter; matched current sources; multiplexed preamplifier; resistors; three lead circuit; three wire circuit; transducer resistance; Bridge circuits; Electrical resistance measurement; Joining processes; Platinum; Resistors; Temperature measurement; Temperature sensors; Transducers; Voltage; Wires;

fLanguage

English

Publisher

ieee

Conference_Titel

Instrumentation and Measurement Technology Conference, 1993. IMTC/93. Conference Record., IEEE

Conference_Location

Irvine, CA

Print_ISBN

0-7803-1229-5

Type

conf

DOI

10.1109/IMTC.1993.382590

Filename

382590