Electricity: power supply or regulation systems – Including an impedance – Thermistor or resistor
Patent
1980-09-25
1982-01-05
Pellinen, A. D.
Electricity: power supply or regulation systems
Including an impedance
Thermistor or resistor
73362AR, 73765, 323909, G01K 716
Patent
active
043096530
ABSTRACT:
An RTD probe interface having a three-wire interconnection with a source excitation line, a source return line, and a sensed signal line, includes: an excitation signal source connected between the source excitation line and the source return line for providing an excitation current signal through the RTD; an amplifier having first and second signal inputs connected respectively to the source excitation line and the sensed signal line, for providing an output voltage signal at a magnitude proportional to the difference magnitude between the voltage signals present at the first and second amplifier inputs, and a bias signal source connected between the sensed signal line and the source return line for presenting a bias current signal to the sensed line, at a magnitude and phase equal to that of the excitation current signal, for providing equal line impedance dependent values in the voltage signals appearing at the first and second inputs of the amplifier.
REFERENCES:
patent: 3783692 (1974-01-01), Hansen
patent: 3805616 (1974-04-01), Sugiyama
Calcasola Richard W.
Stack Timothy F.
Chiantera Dominic J.
Pellinen A. D.
United Technologies Corporation
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