Title :
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
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;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1993. IMTC/93. Conference Record., IEEE
Conference_Location :
Irvine, CA
Print_ISBN :
0-7803-1229-5
DOI :
10.1109/IMTC.1993.382590
