AC-DC transfer standard temperature sensor reversal error compen

Details AC-DC transfer standard temperature sensor reversal error compen AC-DC transfer standard temperature sensor reversal error compen

1985-04-30

1987-04-21

Paschall, M. H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219501, 219505, 374181, H05B 102

Patent

active

046599100

ABSTRACT:
A compensation circuit for a heater wire and a temperature sensor, the temperature sensor generating a signal whose amplitude is dependent upon the amplitude of the voltage across the heater wire. The circuit comprises a comparator circuit and a priority encoder circuit for generating digital information that is a function of the amplitude of the voltage in the heater wire; a multiplexor/demultiplexor circuit, responsive to the digital information generated, for generating a reversal error compensation signal, the generated reversal error compensation signal having an amplitude that is a function of the Peltier and Thomson effects associated with the heater wire; and amplifier/chopper circuits adapted to generate a compensated sensor signal that is a function of the reversal error compensation signal and the uncompensated sensor signal. The amplitude of the compensated sensor signal is approximately that of the signal generated by the sensor in the absence of the Peltier and Thomson effects associated with the heater wire.

REFERENCES:
patent: 4370546 (1983-01-01), Warner
Model 1600A-MOD88, Autobalance True RMS AC/DC Transfer Standard, Ballantino Laboratories-5-1984, pp. 3-31 to 3-15.

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