Archie J Harrison

US Patent:

47333227, Mar 22, 1988

Filed:

Mar 3, 1987

Appl. No.:

7/022541

Inventors:

Jerry Harper - West Caldwell NJ
Archie J. Harrison - Mount Arlington NJ

Assignee:

Ballantine Laboratories, Inc. - Boonton NJ

International Classification:

H01H 504

US Classification:

361103

Abstract:

An overload protection circuit for an AC-DC transfer standard employing a thermoelement comprising a heater element and a temperature sensor. A first differentiator provides an output that is a function of the voltage across the heater element. A second differentiator produces an output that is a function of the output of the first differentiator. Further including a circuit creating an overload signal provided, which is responsive to the outputs of the first and second differentiators.

US Patent:

46599100, Apr 21, 1987

Filed:

Apr 30, 1985

Appl. No.:

6/728886

Inventors:

Archie J. Harrison - Mount Arlington NJ
Jerry Harper - West Caldwell NJ
Fred L. Katzmann - Cedar Grove NJ

International Classification:

H05B 102

US Classification:

219497

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.