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| Number | Title | Issue Date |
| 7528595 | Method for detecting and correcting wiring errors in power monitoring applications A three-phase monitoring system for detecting and dynamically correcting wiring errors in an electrical circuit. The system includes a voltage divider circuit and a current transformer circuit connected to three voltage channels and three current channels, respectiv... | 05/05/2009 |
| 7412338 | Radio frequency device within an energy sensor system An energy measurement system including a radio frequency (“RF”) device powered by a solar panel. The RF device comprising a wireless communication port operative to transmit and receive communication over a wireless network of additional RF devices. The energy m... | 08/12/2008 |
| 7359809 | Electricity metering with a current transformer The data storage and processing resources required for an electric meter are reduced by basing the selection and application of phase error correction on a root mean square load current flowing through the meter. ... | 04/15/2008 |
| 7343255 | Dual source real time clock synchronization system and method A dual source real time clock (RTC) synchronization system and method for implementation within automatic meter reading (AMR) systems that provide system-wide device time synchronization. In one embodiment, a microcontroller-implemented RTC counts elapsed seconds fr... | 03/11/2008 |
| 7336063 | Voltage detector A voltage detector that more accurately measures AC voltage of a voltage conductor by correcting the voltage detected directly by the detector's contact probe to account for the conductor's size and shape. The housing of the detector has plural non-contact electrode... | 02/26/2008 |
| 7315272 | Inverter-based flash analog-to-digital converter using floating resistor ladder An analog-to-digital converter device for converting an analog signal into a digital signal includes a comparator array including a plurality of comparators, each of the comparators including a first inverter and a second inverter connected in series with the first ... | 01/01/2008 |
| 7302752 | Method of manufacturing an extended test switch A method of making and using an extended test switch starting with a previously existing un-extended test switch that is ready for connection to electrical devices to be tested. A housing selected from one or more available housings each having a predetermined lengt... | 12/04/2007 |
| 7274305 | Electrical utility communications and control system A system for managing collection of data and remote operation of fielded remote units is disclosed. The remote units may be incorporated in automatic meter reading systems, capacitor bank switching systems, power line fault detection units, power recloser units, sur... | 09/25/2007 |
| 7259547 | System and method to use dynamic feedback of analog to digital converter sample rate to adaptively lock the sample rate to input frequency A system and method for dynamically lock the sample rate of an analog to digital (ADC) converter to an input frequency. Specifically, a system for measuring power is disclosed. The system includes an ADC converter, a measuring module, an ADC cycle counter, and a cal... | 08/21/2007 |
| 7171265 | Apparatus and method for detecting lead adequacy and quality A method and system for detecting lead adequacy and quality for leads used in devices that sense or deliver low levels of electromagnetic energy. The system includes leads attached to a package substrate having known electrical or optical characteristics. The packag... | 01/30/2007 |
| 7079961 | Method and apparatus for measuring impedance of electrical component under high interference conditions A test system and method having a test channel and an additional channel, and wherein the ratio of amplitude and phase between the interference current through the device under test and the interference signal on the additional channel are determined. The system fur... | 07/18/2006 |
| 6940268 | Apparatus for metering at least one type of electrical power over a predetermined range of service voltages Methods and apparatus for supplying power for use in metering electrical energy over a wide range of voltages with a single meter are disclosed. The wide ranging meter includes a processing unit for processing divided input voltage and a current component in order t... | 09/06/2005 |
| 6927564 | Multimeter instrument with touch-sensitive selection device A multimeter instrument for measuring variables, such as electrical current, voltage, or resistance includes touch-sensitive zones for selection of the variable to be measured. The measurement circuit associated with the variable selected with the aid of touch-sensi... | 08/09/2005 |
| 6828771 | Electrical power measurement An electric power meter measures the value of an electrical power parameter, e.g., Universal Apparent Power or Universal Power Factor, of an electrical power signal in the time domain by: calculating a first instantaneous power component as the product of an instant... | 12/07/2004 |
| 6798187 | Generator status information display for power transfer switch A power transfer arrangement is provided for supplying power from a generator to the electrical system of a building in the event of a utility power interruption. The power transfer arrangement has a power transfer switching mechanism adapted for interconnection wit... | 09/28/2004 |
| 6753678 | Voltage detector with improved accuracy The present invention is a voltage detector that is capable of measuring AC voltages, especially the high voltages encountered by electric utility linemen, with improved accuracy. To obtain these improvements in accuracy the present invention includes a novel circui... | 06/22/2004 |
| 6617839 | Method for detecting current transformer saturation Disclosed is a method for detecting saturation of a current transformer. The method determines whether or not a change of a secondary current generated in a current transformer is due to the saturation of the current transformer.... | 09/09/2003 |
| 6441602 | Method and apparatus for determining phase locked loop jitter An exemplary embodiment of the invention is a method for evaluating jitter of a phase locked loop circuit generating a phase locked loop output signal. The method includes generating a test initiate signal and generating a trigger signal in response to th... | 08/27/2002 |
| 6275021 | Electricity meter The invention relates to an electricity meter with signal channels that are passed to a digital signal processing device and each of which has a multiplexer with downstream analog/digital converter. Voltage signals of an electrical consumer can be connect... | 08/14/2001 |
| 6229295 | Apparatus for metering at least one type of electrical power over a predetermined range of service voltages An apparatus for metering electrical energy over a predetermined range of voltages within a single meter. The meter includes a divider network for dividing the voltage to generate a divided voltage. The divided voltage is substantially linear with minimal... | 05/08/2001 |
| 6147484 | Device for measuring power using switchable impedance A device for measuring power, or other circuit parameters, of an alternating current load. The device has an ammeter and voltmeter for measuring voltage across the device and current through the device. The device also has a known impedance element that i... | 11/14/2000 |
| 6115676 | Methods and apparatus for performing load profile and load control An electronic energy meter register which, in one aspect, is configured to perform load profile recording in a manner which eliminates a need for a back-up battery is described. In other aspects, the present invention is a routine of operating a meter reg... | 09/05/2000 |
| 6112158 | Service type recognition in electrical utility meter Disclosed is a method and arrangement for use in an electrical utility meter, the electrical utility meter operable to be connected to a plurality of electrical service types. The arrangement is operable to identify a present service type, the present ser... | 08/29/2000 |
| 6104182 | Method of deriving a signal indicating an oscillation in an electric power supply system Current and voltage space vectors of the positive sequence system are formed from phase current and phase voltage sampling values of an electric power supply system, and power quantities of the positive sequence system are derived from them. System freque... | 08/15/2000 |
| 6091237 | Three-phrase clamp-type power meter A three-phase clamp-type power meter comprises a main body suitable to be held by hand during operation, a clamp assembly to clamp around an external power line to measure the current flowing in the power line, two test terminals on the main body for conn... | 07/18/2000 |
| 6058354 | Electricity meter to measure electrical physical magnitudes which are parameters or functions of measured voltages and/or currents An electricity meter contains analog/digital converters to transform input analog voltages and currents into sampled digital values. A first high speed processor derives auxiliary magnitudes from the sampled digital values without intermediate storage. Th... | 05/02/2000 |
| 5966010 | Electrical energy meter with snap fit interlocking parts An electrical energy meter is provided with snap fit interlocking parts that eliminate the need for screws or fasteners. The current sensor, located within the meter, has a plurality of current conductors and a notched blade attached to each current condu... | 10/12/1999 |
| 5924050 | Arithmetic unit First and second 1-bit A/D converters convert respective input voltages being in direct proportion to voltage and current of a measurement system into respective 1 bit codes. First and second up-down counters whose up/down count in respective clock termin... | 07/13/1999 |
| 5903145 | Universal electronic energy meter for use with 4-wire standard services A universal electronic energy meter for measuring electrical energy usage of a circuit having a 4-wire service is disclosed. The universal meter is operable with both 4-wire wye and 4-wire delta services without modification to the meter's hardware or sof... | 05/11/1999 |
| 5796631 | Method and apparatus for monitoring and characterizing power quality, faults and other phenomena in network power systems A method and apparatus for receiving, monitoring and characterizing network power information in real time through the use of a specialized display system. A processor receives three phase current and voltage information from a network power relay, conver... | 08/18/1998 |
| 5764523 | Electronic watt-hour meter In a method of calculating an electric power by digitalizing a voltage signal and a current signal of an electronic watt-hour meter and multiplying digitalized signals, precision of an electric power calculation is improved by a circuit arrangement suitab... | 06/09/1998 |
| 5737730 | Measuring process for measuring chargeable electrical consumption from an electrical network and electronic electricity meter A process for measuring electricity consumption, especially suitable for small consumers, comprises the steps of continuously measuring consumer current, integrating the current with time to obtain a value (A.h) relating to consumption; adjusting the inte... | 04/07/1998 |
| 5673196 | Vector electricity meters and associated vector electricity metering methods Line voltage and line current signals are sensed on a power line having at least one conducting path. The sensed line voltages and line currents are converted into a digital signal. A phase-to-neutral voltage signal and phase current signal are computed f... | 09/30/1997 |
| 5642300 | Precision voltage/current/power source In the precision source disclosed herein, a reference waveform and a correction waveform are combined and fed to an output amplifier which supplies an output waveform to a load, e.g., a wattmeter under test. The reference and correction waveforms are gene... | 06/24/1997 |
| 5537028 | Electricity meter and method for measuring apparent power An electricity meter and method for measuring VA power consumption. The electricity meter comprises a transducer circuit receiving line current and line voltage and producing a first signal corresponding to active power on the line, and a level shifting c... | 07/16/1996 |
| 5508617 | Electric power measuring apparatus and method The current invention is directed to a method of measuring an electric power and in particular to a precise power measurement by measuring a current and a voltage of high-frequency distortion waves. The current power measuring method is based upon a summa... | 04/16/1996 |
| 5497077 | Power calculating device A power calculating device including a control signal generating unit for generating a control signal. The control signal determines a power calculating period and an imbalance compensation period. The device also includes an input voltage changeover unit... | 03/05/1996 |
| 5475303 | Electronic watthour meter A first Hall element is supplied with a current proportional to a load voltage and applied with a magnetic field proportional to a load current and produces a voltage proportional to a load power given by the load voltage and the load current. A second Ha... | 12/12/1995 |
| 5450007 | Method and apparatus for power measuring A method for generating a product of signals proportional to the voltage of an electrical supply and the current flowing through a load connected thereto, comprises the steps of deriving a first signal proportional to the said supply voltage, deriving a s... | 09/12/1995 |
| 5446374 | Potentiometer multiplier circuit, and an electrical energy meter including such a circuit A circuit has two multiplier modules. Each multiplier module has at least one controllable potentiometer for adjusting the amplitude ratio between an output signal and an input signal of the module. The potentiometers have substantially identical characte... | 08/29/1995 |
