Fluke Corporation

David Lawrence Epperson

Ricardo Rodriguez

Jeffrey E Worones

Ronald Steuer

Clark N Huber

Matthew Carl-Robert Bannister

Glen Howard Vetter

Joseph V Ferrante

Paul Herman Heydron

Paul Andrew Ringsrud

Patrick Scott Hunter

Michael F Gallavan

John M Gilbert

Christian Karl Schmitzer

Peter Radda

Jeetendra Patel

Thomas Duffy Anderson

Luis Alberto Katz

Henricus Koppelmans

Paul Heydron

Systems and methods provide a non-contact current measurement system which operates to measure alternating current flowing through an insulated wire without requiring galvanic contact with the insulated wire. The measurement system may include a magnetic field sensor that is selectively positionable proximate an insulated wire under test. In operation the magnetic field sensor detects a magnetic field generated by the current flowing in the insulated wire. Using an adjustable clamp assembly, the measurement system provides control over the mechanical positioning of the insulated wire relative to the magnetic field sensor to ensure consistent measurements. The non-contact current measurement system may determine information relating to the physical dimensions (e.g., diameter) of the insulated wire. Using the detected magnetic field, the known mechanical positioning, and the determined information relating to the physical dimensions of the insulated wire, the measurement system accurately determines the magnitude of the current flowing through the insulated wire without galvanic contact.

Non-contact current measurement system

A Rogowski coil in a sensor unit has voltage induced by a conductor surrounded by the Rogowski coil. The voltage is integrated to represent current which is converted to digital data representing current in the conductor and sent wirelessly to a multimeter. The sensor unit may receive control signals from the multimeter and a remote control apparatus. A plurality of sensor units may be networked and controlled by the remote control apparatus.

Wireless Rogowski coil system

Systems and methods for measuring alternating current (AC) voltage of an insulated conductor are provided, without requiring a galvanic connection between the conductor and a test electrode. A non-galvanic contact voltage measurement device includes a conductive sensor, an internal ground guard, and a reference shield. A reference voltage source is electrically coupleable between the guard and the reference shield to generate an AC reference voltage which causes a reference current to pass through the conductive sensor. Sensor subsystems may be arranged in layers (e.g., stacked layers, nested layers, or components) of conductors and insulators. The sensor subsystems may be packaged as formed sheets, flexible circuits, integrated circuit (IC) chips, nested components, printed circuit boards (PCBs), etc. The sensor subsystems may be electrically coupled to suitable processing or control circuitry of a non-contact voltage measurement device to allow for measurement of voltages in insulated conductors.

Sensor subsystems for non-contact voltage measurement devices

Wireless rogowski coil system

Systems and methods provide a portable, verified voltage source that allows safe testing of separate non-contact voltage measurement systems. A proving unit of the present disclosure provides a known or specified alternating current (AC) voltage output across an insulated wire, which AC voltage may be fixed or may be user-selectable through a suitable user interface. The proving unit may include a visual indicator and/or an audible indicator that provides the user with an indication confirming that the proving unit is supplying an output voltage with the specifications of the proving unit, so the user will know that the proving unit is operating normally and is ready for testing a non-contact voltage measurement system. If the proving unit cannot provide the specified voltage output, the indicator(s) provides a signal to the user that the proving unit is currently non-functional.

Proving unit for non-contact voltage measurement systems

Systems and methods provide measurement of alternating current (AC) electrical parameters in an insulated wire without requiring a galvanic connection between the insulated wire and a test probe. Measurement systems or instruments may include a housing that includes both a non-contact voltage sensor and a non-contact current sensor. The measurement system obtains measurements from the voltage sensor and the current sensor during a measurement time interval and processes the measurements to determine AC electrical parameters of the insulated wire. The AC electrical parameters may be presented to an operator via a visual indicator device (e.g., display, lights). The AC electrical parameters may additionally or alternatively be communicated to an external device via a wired and/or wireless communications interface. The measurement system may include an alignment feedback sensor that provides feedback to a user regarding the mechanical alignment of the insulated wire relative to the voltage sensor and the current sensor.

Non-contact electrical parameter measurement systems

Systems and methods provide a portable, verified voltage source that allows safe testing of separate non-contact voltage measurement systems. A proving unit of the present disclosure provides a known or specified alternating current (AC) voltage output across an insulated wire, which AC voltage may be fixed or may be user-selectable through a suitable user interface. The proving unit may include a visual indicator and/or an audible indicator that provides the user with an indication confirming that the proving unit is supplying an output voltage with the specifications of the proving unit, so the user will know that the proving unit is operating normally and is ready for testing a non-contact voltage measurement system. If the proving unit cannot provide the specified voltage output, the indicator(s) provides a signal to the user that the proving unit is currently non-functional. The proving unit may additionally verify contact voltage measurement systems (e.g., DMMs).

Proving unit for voltage measurement systems

In at least one embodiment, a handheld measurement system generates a measurement image derived from measurement data that is generated and/or received by the handheld measurement system. The handheld measurement system also generates a plurality of option images that each correspond to a particular selectable option. A display screen, which may be a touch screen, simultaneously displays the measurement image and the option images. The measurement device modifies the measurement image and/or the option images in response to received option image selections.

Handheld measurement system with selectable options

Embodiments of the present disclosure are generally directed to handheld systems, individual components, and methods of using such systems and components for measuring parameters, such as electrical, mechanical, and physical measurement parameters. In one embodiment of the present disclosure, a gateway device for a measurement system generally includes a first communication system for receiving at least one signal containing data according to a first protocol, wherein the at least one signal includes at least one measurement value from at least one handheld measurement device, a signal translator for translating the signal containing the data to another signal containing the data according to a second protocol different from the first protocol, and a data memory system for storing data on the gateway device.

Handheld devices, systems, and methods for measuring parameters

Systems and methods of providing a magnetically coupled ground reference probe for use with test equipment, such as digital multimeters (DMMs). The magnetically coupled ground reference probes disclosed herein may be used instead of a typical test probe or alligator clip. A magnetically coupled ground reference probe may be provided which includes an insulative housing surrounding a conductive magnet such as a permanent magnet or an electromagnet. The magnet may autonomously retract into a cavity of the insulative housing when not coupled to a ground reference so that the magnet does not contact a high potential source when being handled by the operator. In at least some implementations, at least a portion of the insulation material of the housing may be compressible to allow the magnet to come into physical contact with a ground reference surface while providing a sufficient creepage and clearance path.

Magnetically coupled ground reference probe

A technician uses a wireless apparatus and system to vary air or fuel in the burner to optimize efficiency and safety. A wireless remote sensor unit has a probe in a flue to draw a sample of combustion gas from the flue for gas sensors and a temperature sensor. The sensors generate analog signals of gas identity, concentration and temperature that are converted to digital signals by an A-to-D converter. A wireless transceiver sends digital signals to a hand held unit or central computer via wireless transmission. The hand held unit receives the digital signals and displays an analysis of the signals. The analysis may be performed by any one of the remote sensor unit, the hand held unit, or the central computer. The wireless unit also receives control signals for the hand held unit or the central computer.

Wireless combustion/efficiency analyzer

An installation test system has a control device and one or more hand-held test devices. The control device and the one or more hand-held devices are in wireless communication via respective communication systems. The control device performs typical pre-power tests including insulation testing and ground testing. There is at least one hand-held device dedicated to testing for residual current in circuit breakers and another hand-held device dedicated to testing for loop impedance. The control device records all test data and stores data in storage.

Wireless test measurement

An analytical gateway device receives measurement data comprising one or more measurement values from one or more measurement devices. The gateway device selects a measurement application from a plurality of measurement applications available for execution (e.g., on the gateway device or some other computing device) based at least in part on the measurement data. For example, the measurement application can be selected based on measurement type information. The measurement type information may include one or more measurement units associated with the measurement values. The gateway device may cause a user interface (or some other information) associated with the measurement application to be presented on a display (e.g., a display of the gateway device or some other computing device in communication with the gateway device).

Analytical gateway device for measurement devices

A system providing a power source includes an electrical input and multiple electrical outputs. The electrical input is couplable to a current clamp that selectively clamps around at least one electrical conductor. A transformer coupled to the electrical input receives an input electrical signal from the at least one electrical conductor and produces an output electrical signal that is electrically isolated from the input electrical signal. Conversion circuitry electrically converts the output electrical signal to a converted electrical signal that is usable to power multiple electrical devices. Distribution circuitry distributes the converted electrical signal to the multiple electrical outputs, wherein each electrical output is couplable to an electrical device to provide power to the electrical device.

Growing community of inventors

Everett, WA, United States of America

David Lawrence Epperson