Accurate hand-held digital readout thermometer

Details Accurate hand-held digital readout thermometer Accurate hand-held digital readout thermometer

1981-05-26

1984-01-03

Kazenske, E. R.

Thermal measuring and testing

Temperature measurement

By electrical or magnetic heat sensor

374173, 374181, 374182, 374121, G01K 714

Patent

active

044239688

ABSTRACT:
A hand-held digital readout thermometer measures temperatures over the range -50.degree. C. to +1100.degree. C. with a maximum error less than 3.degree. C. in that range. The thermometer includes a thermocouple, a temperature stable and temperature independent power supply, a temperature stable differential first amplifier, a second amplifier that compensates for the nonlinear response of thermocouple voltage to temperature, and an analog/digital converter controlling a digital display indicating temperature according to a preselected scale. A particular feature of the invention is a latching comparator capable of activating a low battery indicator when the supply voltage drops below a preselected value.

REFERENCES:
patent: 3067610 (1962-12-01), Bockemuehl et al.
patent: 3586168 (1971-06-01), Osheff
patent: 3766781 (1973-10-01), Roberts
patent: 3777568 (1973-12-01), Risgin et al.
patent: 3916691 (1975-11-01), Hollander et al.
patent: 4150433 (1979-04-01), Kaniel
Daniel Sheingold, Ed., Non-Linear Circuits Handbook, (Analog Devices, Norwood, Mass. 1974), pp. 94-97.
Kerel E. Kuijk, A Precision Reference Voltage Source, IEEE J. of Solid State Circuits (Jun. 1973), p. 222.
Schematic Diagram, Newport Model 268 Digital Pyrometer.
Advertising and Circuit Diagram, Atkins "Digi-Sense."

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