An electrical arc detector for a series electrical connection as may be associated with an electric meter may comprise: an arc detector housing; a source of electrical power; a de-tuned resonant tank circuit configured to receive a magnetic field and/or an electric field generated by an electrical arc at a series electrical connection; an electrical detector for detecting signals generated in the de-tuned resonant tank circuit responsive to the magnetic field and/or the electric field generated by an electrical arc; and an output device responsive to the electrical detector and configured to provide a human perceivable indication of detection of an electrical arc at the series electrical connection.

An encoder includes an encoder circuit including first and second switches, a first resistor connected in series to the first switch, and a second resistor connected in series to the second switch, the encoder circuit defined by the first switch and the first resistor and the second switch and the second resistor being connected between a power supply voltage and a ground, and a control circuit connected between the first and second resistors and the power supply voltage to turn off power supply from the power supply voltage to the first resistor when the first switch is closed and to turn off power supply from the power supply voltage to the second resistor when the second switch is closed. The control circuit is connected to a first connection point between the first resistor and the first switch and to a second connection point between the second resistor and the second switch.

A method for detecting the presence of an energized e-field in a space, wherein the space includes at least one electrically conductive element disposed in the space and coupled with a controller, the method including receiving in the controller a signal from the at least one electrically conductive element, determining that an energized e-field occupies the space, and sending a signal from the controller indicative of the presence of the energized e-field in the space.

A proximity detector circuit that receives a single-ended sensor signal includes (a) an adaptive level control circuit maintaining the single-ended sensor signal within a predetermined voltage range relative a common mode reference signal; and (b) a programmable gain amplifier receiving the single-ended sensor signal and the common mode reference signal as a differential input signal, and providing an output signal derived from amplifying the differential input signal.

A method of eliminating spurs in measurements of an electrical response of a device under test (OUT) obtained uses a measurement instrument including a mixer and a receiver. The measurement instrument is configured to generate, via the mixer, an intermediate frequency (IF) signal for use by the receiver from a radio frequency (RF) signal and a local oscillator (LO) signal. Input is received from a user at the measurement instrument and includes start frequency and end frequency. Parameters for a frequency sweep are generated based on the input. A measurement for each frequency of the frequency sweep is calculated using averaging of a plurality of samples obtained at that frequency. Frequencies are identified within the frequency sweep at which spurs will occur due to the measurement instrument. The parameters for a frequency of the frequency sweep at which a spur will occur are modified so that a null for a measurement at the frequency falls on the spur.

Apparatuses and methods of distinguishing between a finger and stylus proximate to a touch surface are described. One apparatus includes a first circuit to obtain capacitance measurements of sense elements when a conductive object is proximate to a touch surface. The apparatus also includes a second circuit coupled to the first circuit. The second circuit is operable to detect whether the conductive object activates the first sense element, second sense element, or both, in view of the capacitance measurements. To distinguish between a stylus and a finger as the conductive object, the second circuit determines the conductive object as being the stylus when the second sense element is activated and the first sense element is not activated and determines the conductive object as being the finger when the first sense element and the second sense element are activated.

A disk drive thermal performance testing device includes a drive housing, an electrical connector and an adjustable power loading device. The drive housing is at least partially made of a thermally conductive material. The electrical connector is in the drive housing and provides an external connection. The adjustable power loading device is located in the drive housing, is coupled to the electrical connector, and is thermally coupled to the drive housing.

A power monitoring system includes a plurality of current sensors suitable to sense respective changing electrical current within a respective conductor to a respective load and a conductor sensing a respective voltage potential provided to the respective load. A power monitors determines a type of circuit based upon a signal from at least one of the current sensors and a signal from the conductor, wherein the type of circuit includes at least one of a single phase circuit, a two phase circuit, and a three phase circuit. The power meter configures a set of registers corresponding to the determined type of circuit in a manner such that the configuring is different based upon each of the single phase circuit, two phase circuit, and three phase circuit suitable to provide data corresponding to the determined type of circuit.

A solid state impedance tuner or impedance tuner system including a housing structure and at least two solid state tuner modules electrically combined and disposed in one package within the housing structure. Each tuner module includes at least one solid state control element. Another embodiment is directed to an impedance tuner module card configured in a standardized system architecture. The card includes a chassis board, and at least one solid state tuner module integrated on the card and supported on or by the chassis board, each module including at least one solid state control element. Methods for calibrating a solid state impedance tuner that includes at least two solid state tuner modules combined in one package are disclosed.

The present disclosures relates to an apparatus and a method for detecting power abnormality of an engine-type forklift truck, and the apparatus for detecting power abnormality of an engine-type forklift truck includes: a power supply unit including a pair of batteries so as to supply power to an electric device included in an engine-type forklift truck; an engine control unit (ECU) which receives power from the power supply unit; an equalizer which is provided between the power supply unit and the ECU so as to maintain a voltage balance between the pair of batteries and adjust a voltage of power supplied to the ECU; and an abnormality detecting unit which compares a voltage input from the pair of batteries with a voltage input from any one of the pair of batteries, and detects abnormality in the voltage balance.