A floating input detection method and circuits. A method for detecting a floating signal input terminal includes providing a common-mode input voltage to a first amplifier coupled to the signal input terminal, and providing an output signal generated by the first amplifier to: a non-inverting input of a second amplifier coupled to the signal input terminal, an inverting input of the second amplifier, coarse detection circuitry, and fine float detection circuitry. The method also includes comparing, by the coarse detection circuitry, the output signal to a first threshold voltage, and determining the signal input terminal to be not floating responsive to the comparing indicating that the output signal is greater than the first threshold voltage.

A device for magnetic measurement that includes a DC magnetic field sensor having at least four discrete elements, each of the discrete elements being constituted by at least one coil and a magnetic material without remanence, where the at least four discrete elements are substantially identical. The magnetic field sensor includes a first discrete element orientated in a given direction, and a second discrete element associated therewith to constitute a first differential pair. The second discrete element being orientated in parallel but in an opposite direction relative to the first discrete element. The device further including two other discrete elements constituting a second differential pair substantially identical to the first differential pair. The two other discrete elements being parallel to the orientation of the first differential pair but are respectively orientated in an opposite direction to the first and second discrete elements of the first differential pair.

A device for magnetic measurement that includes a DC magnetic field sensor having at least four discrete elements, each of the discrete elements being constituted by at least one coil and a magnetic material without remanence, where the at least four discrete elements are substantially identical. The magnetic field sensor includes a first discrete element orientated in a given direction, and a second discrete element associated therewith to constitute a first differential pair. The second discrete element being orientated in parallel but in an opposite direction relative to the first discrete element. The device further including two other discrete elements constituting a second differential pair substantially identical to the first differential pair. The two other discrete elements being parallel to the orientation of the first differential pair but are respectively orientated in an opposite direction to the first and second discrete elements of the first differential pair.

A rotary tool diagnosis system according to one aspect of the present invention includes a first current detector, a second current detector, and a signal processing device. The first current detector detects a current of at least one power line connected to a first electric motor that rotates a rotary tool. The second current detector detects a current of at least one power line connected to a second electric motor that is used for moving the rotary tool. The signal processing device triggers based on a result of processing on an output signal of the second current detector and starts recording of an output signal from the first current detector.

A rotary tool diagnosis system according to one aspect of the present invention includes a first current detector, a second current detector, and a signal processing device. The first current detector detects a current of at least one power line connected to a first electric motor that rotates a rotary tool. The second current detector detects a current of at least one power line connected to a second electric motor that is used for moving the rotary tool. The signal processing device triggers based on a result of processing on an output signal of the second current detector and starts recording of an output signal from the first current detector.

The various embodiments herein provide an energy harvester which can capacitively harvest stray electric field from low-voltage AC power lines without a physical grounding connection. The energy harvester comprises an inner electrode, an outer electrode and a circuit. The inner electrode forms an inner periphery of an upper portion of a harvester housing. The outer electrode forms an inner base of a lower portion of the harvester housing to provide a local ground reference. The circuit is housed within the lower portion of the harvester housing to direct stored energy and control an energy discharge.

The various embodiments herein provide an energy harvester which can capacitively harvest stray electric field from low-voltage AC power lines without a physical grounding connection. The energy harvester comprises an inner electrode, an outer electrode and a circuit. The inner electrode forms an inner periphery of an upper portion of a harvester housing. The outer electrode forms an inner base of a lower portion of the harvester housing to provide a local ground reference. The circuit is housed within the lower portion of the harvester housing to direct stored energy and control an energy discharge.

A shock awareness system including a shock detector for measuring an electrical condition in a body of water and a remote station in communication with the shock detector with the shock awareness system displaying a measured electrical condition in the body of water in relation to a known hazardous electrical condition in the body of water to enable an operator to determine a level of danger in a body of water.

A shock awareness system including a shock detector for measuring an electrical condition in a body of water and a remote station in communication with the shock detector with the shock awareness system displaying a measured electrical condition in the body of water in relation to a known hazardous electrical condition in the body of water to enable an operator to determine a level of danger in a body of water.

A device to measure the voltage at a test point, also referred to as a test point voltage sensor, comprises a housing formed from a first material and a second material, wherein the first material comprises an insulating material and the second material comprises a conductive or semiconductive material. The housing includes an opening configured to cover a test point of a cable accessory. The device further includes a pressure pad, disposed in the housing, having a conductive mating surface configured to contact a test point of the basic insulation plug or end plug. The device further includes a low side capacitor embedded in the housing and electrically coupled to the conductive mating surface. The device further includes a signal wire electrically coupled to the low side capacitor.