Patents by Inventor Benjamin Eng, Jr.
Benjamin Eng, Jr. has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9116177Abstract: A resistance measuring circuit includes a current generating component, a current control component, and a voltage measurement component. The magnitude of a target resistance can be measured by connecting the target resistance between first and second measurement terminals of the resistance measuring circuit, applying a current generated by the current generating component to the target resistance, and determining the voltage across the target resistance. When no target resistance is connected between the first and second measurement terminals, the current control component controls the current generating component to reduce current consumption of the resistance measuring circuit.Type: GrantFiled: August 1, 2011Date of Patent: August 25, 2015Assignee: Fluke CorporationInventor: Benjamin Eng, Jr.
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Patent number: 8480301Abstract: Systems and methods for dissipating heat generated during an electrical function are disclosed. In particular, the disclosed systems and methods can be used for dissipating heat generated during low impedance measurement on a multimeter. In some embodiments, the multimeter can include a first thermistor coupled in series with a resistor in a measurement path, a second thermistor, and a switch coupled to the measurement path and the second thermistor for selectively including the second thermistor in the measurement path during a low impedance measurement.Type: GrantFiled: December 20, 2010Date of Patent: July 9, 2013Assignee: Fluke CorporationInventor: Benjamin Eng, Jr.
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Publication number: 20130169268Abstract: A passive radio frequency probe that can detect low level RF signals is disclosed. Schottky diodes are used in the probe to convert alternating current (AC) signals to direct current (DC) signals on a one-to-one basis within a given tolerance. The probe is used with a DC voltmeter to permit measurements of radio frequency signals.Type: ApplicationFiled: December 29, 2011Publication date: July 4, 2013Applicant: Fluke CorporationInventor: Benjamin Eng, JR.
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Publication number: 20110285414Abstract: A resistance measuring circuit includes a current generating component, a current control component, and a voltage measurement component. The magnitude of a target resistance can be measured by connecting the target resistance between first and second measurement terminals of the resistance measuring circuit, applying a current generated by the current generating component to the target resistance, and determining the voltage across the target resistance. When no target resistance is connected between the first and second measurement terminals, the current control component controls the current generating component to reduce current consumption of the resistance measuring circuit.Type: ApplicationFiled: August 1, 2011Publication date: November 24, 2011Applicant: Fluke CorporationInventor: Benjamin Eng, JR.
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Patent number: 7990162Abstract: A resistance measuring circuit includes a current generating component, a current control component, and a voltage measurement component. The magnitude of a target resistance can be measured by connecting the target resistance between first and second measurement terminals of the resistance measuring circuit, applying a current generated by the current generating component to the target resistance, and determining the voltage across the target resistance. When no target resistance is connected between the first and second measurement terminals, the current control component controls the current generating component to reduce current consumption of the resistance measuring circuit.Type: GrantFiled: August 14, 2007Date of Patent: August 2, 2011Assignee: Fluke CorporationInventor: Benjamin Eng, Jr.
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Publication number: 20110164656Abstract: Systems and methods for dissipating heat generated during an electrical function are disclosed. In particular, the disclosed systems and methods can be used for dissipating heat generated during low impedance measurement on a multimeter. In some embodiments, the multimeter can include a first thermistor coupled in series with a resistor in a measurement path, a second thermistor, and a switch coupled to the measurement path and the second thermistor for selectively including the second thermistor in the measurement path during a low impedance measurement.Type: ApplicationFiled: December 20, 2010Publication date: July 7, 2011Applicant: Fluke CorporationInventor: Benjamin Eng, JR.
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Patent number: 7854549Abstract: Systems and methods for dissipating heat generated during an electrical function are disclosed. In particular, the disclosed systems and methods can be used for dissipating heat generated during low impedance measurement on a multimeter. In some embodiments, the multimeter can include a first thermistor coupled in series with a resistor in a measurement path, a second thermistor, and a switch coupled to the measurement path and the second thermistor for selectively including the second thermistor in the measurement path during a low impedance measurement.Type: GrantFiled: June 29, 2007Date of Patent: December 21, 2010Assignee: Fluke CorporationInventor: Benjamin Eng, Jr.
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Publication number: 20090045825Abstract: A resistance measuring circuit includes a current generating component, a current control component, and a voltage measurement component. The magnitude of a target resistance can be measured by connecting the target resistance between first and second measurement terminals of the resistance measuring circuit, applying a current generated by the current generating component to the target resistance, and determining the voltage across the target resistance. When no target resistance is connected between the first and second measurement terminals, the current control component controls the current generating component to reduce current consumption of the resistance measuring circuit.Type: ApplicationFiled: August 14, 2007Publication date: February 19, 2009Applicant: FLUKE CORPORATIONInventor: Benjamin ENG, JR.
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Publication number: 20090003410Abstract: Systems and methods for dissipating heat generated during an electrical function are disclosed. In particular, the disclosed systems and methods can be used for dissipating heat generated during low impedance measurement on a multimeter. In some embodiments, the multimeter can include a first thermistor coupled in series with a resistor in a measurement path, a second thermistor, and a switch coupled to the measurement path and the second thermistor for selectively including the second thermistor in the measurement path during a low impedance measurement.Type: ApplicationFiled: June 29, 2007Publication date: January 1, 2009Applicant: FLUKE CORPORATIONInventor: Benjamin Eng, JR.
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Patent number: 6624640Abstract: An apparatus and method of measuring capacitances are provided in which charge packets of known value are delivered to a capacitor of unknown value until a final voltage is determined, and the capacitance is calculated based on the known total charge and measured voltage.Type: GrantFiled: February 7, 2001Date of Patent: September 23, 2003Assignee: Fluke CorporationInventors: John M. Lund, Benjamin Eng, Jr.
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Patent number: 5321403Abstract: A multiple slope integrating analog-to-digital converter (ADC) includes many improvements and refinements which eliminate timing and non-linearity errors which accumulate due to a large number of switching operations that occur over an integrate cycle. The ADC includes an integrator and a comparator in which an input voltage to be measured is applied to a summing node at the input of the integrator during an integrate cycle, while at the same time positive and negative reference currents are selectively applied to the summing node by a controller which monitors the output of the comparator in order to limit the voltage magnitude at the output of the integrator. Thereafter, during a de-integrate cycle, the input voltage is disconnected while progressively shallower ramps are measured with a high-speed clock for greater resolution and accuracy. The comparator has a slight hysteresis built in to slightly separate the switching thresholds for positive-going and negative going ramps.Type: GrantFiled: April 14, 1993Date of Patent: June 14, 1994Assignee: John Fluke Mfg. Co., Inc.Inventors: Benjamin Eng, Jr., Don P. Matson
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Patent number: 4857878Abstract: A miniature high frequency power transformer comprises first and second "E" shaped ferrite core halves surrounding mating inner and outer modular transformer bobbins having formed thereon respectively the primary and secondary windings of the transformer. The inner and outer modular transformer bobbins are positioned such that the inner transformer bobbin is inserted into the outer transformer bobbin with the secondary windings surrounded by the primary windings. When assembled, the inner modular transformer bobbin has a protrusion that extends axially therefrom through the outer bobbin and terminates in first core retaining ears at one end of the transformer. Second core retaining ears extend from the opposite end of the transformer, and both ears receive the "E" shaped core halves, maintained in position on the transformer by bonding.Type: GrantFiled: January 19, 1988Date of Patent: August 15, 1989Inventors: Benjamin Eng, Jr., Margaret E. Winsor
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Patent number: 4847547Abstract: A battery charger supplies to a battery an output voltage having a desired temperature coefficient of voltage. The charger includes an operational amplifier having a summing junction to which a reference current and a feedback signal derived from the amplifier output are supplied. The V.sub.be multiplier circuit includes a bipolar transistor which is biased into its active region so that the charging voltage supplied by the amplifier is temperature corrected in accordance with a negative coefficient of voltage characteristic of the transistor.Type: GrantFiled: July 21, 1988Date of Patent: July 11, 1989Assignee: John Fluke Mfg., Co. Inc.Inventor: Benjamin Eng, Jr.
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Patent number: 4583009Abstract: The ladder network of a recirculation of remainder analog to digital converter has a voltage source that is regulated by a transistor and Zener diode together with feedback circuitry responsive to the regulated output voltage. Current through the circuit is controlled by feedback to establish equal and opposite temperature coefficients in the transistor and Zener diode of the regulator. The temperature stabilized voltage regulator produced thereby eliminates any requirement for trimmer potentiometers.Type: GrantFiled: November 14, 1983Date of Patent: April 15, 1986Assignee: John Fluke Mfg. Co., Inc.Inventor: Benjamin Eng, Jr.
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Patent number: 4555692Abstract: In a recirculation of remainder type analog to digital converter, successive remainders recirculated to develop an output digital signal are overlapped to cancel common error components.Type: GrantFiled: November 14, 1983Date of Patent: November 26, 1985Assignee: John Fluke Mfg. Co., Inc.Inventors: Benjamin Eng, Jr., Peter S. Duryee, John M. Anholm, Jr.
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Patent number: 4539550Abstract: The ladder network of a recirculation of remainder analog to digital converter has pairs of controlled switches connected alternately to a voltage source and a ground, to establish unidirectional current flow through the switches. Unidirectional current flow eliminates ladder error caused by current flow direction resistances inherent in the switches.Type: GrantFiled: November 14, 1983Date of Patent: September 3, 1985Assignee: John Fluke Mfg. Co., Inc.Inventors: Benjamin Eng, Jr., John M. Anholm, Jr., Peter S. Duryee
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Patent number: 4511856Abstract: A circuit for supplying regulated first and second supply voltages to the amplifier/comparator of a recirculation of remainder analog to digital converter, comprises a series pair of transistors connected as emitter followers between unregulated voltage sources. Outputs of the emitter followers carry the regulated supply voltages and are applied to the supply terminals of the amplifier/comparator. A pair of diodes connected in series between the bases of the emitter followers establish the magnitudes of the two regulated supply voltages. The junction voltage between the two Zener diodes is controlled by a difference amplifier that in turn is responsive to an analog input voltage and the output of the amplifier/comparator. The output of the difference amplifier causes the regulated supply voltages to track a common mode signal component inherent in the converter and thereby improves component accuracy.Type: GrantFiled: November 14, 1983Date of Patent: April 16, 1985Assignee: John Fluke Mfg. Co., Inc.Inventor: Benjamin Eng, Jr.