Jerry L Harper Deceased12 Sager Pl, Irvington, NJ 07111
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Us Patents
Ac-Dc Transfer Standard Overload Protection Circuit
US Patent:
4733322, Mar 22, 1988
Filed:
Mar 3, 1987
Appl. No.:
7/022541
Inventors:
Jerry Harper - West Caldwell NJ
Archie J. Harrison - Mount Arlington 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.
Ac-Dc Transfer Standard Temperature Sensor Reversal Error Compensation Circuit
US Patent:
4659910, 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
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.
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