| Patents for G01R 21 - Arrangements for measuring electric power or power factor (6,609) |
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| 11/15/1990 | WO1990013984A1 Electronic meter reader system |
| 11/14/1990 | EP0397311A2 RF-power detection circuit |
| 11/14/1990 | EP0396665A1 Power measurement apparatus. |
| 11/13/1990 | US4970459 Electronic meter chopper stabilization |
| 11/13/1990 | US4970456 Temperature compensated power detector |
| 11/13/1990 | CA1276234C Electrical measuring instrument for high voltage power measurements |
| 11/06/1990 | US4968150 Process and arrangement for measuring the energy of a microwave pulse |
| 10/18/1990 | WO1990012325A1 A sampling circuit |
| 10/17/1990 | EP0392367A2 Load state decision apparatus of servomotor |
| 10/16/1990 | US4963820 Energy meter |
| 10/16/1990 | CA1275304C Time-of-use-meter with a calendar of cyclic events |
| 10/10/1990 | EP0391577A2 Sampling circuits |
| 10/03/1990 | EP0390651A2 Fiberoptic techniques for measuring the magnitude of local microwave fields and power |
| 10/03/1990 | EP0389749A2 Appliance for measuring electrical power or energy |
| 10/03/1990 | EP0389680A1 Phase detector for mark-space-modulation-type signals |
| 09/26/1990 | EP0388522A2 Electronic watt-hour meter with combined multiplier/integrator circuit |
| 09/19/1990 | CN1045457A 静电电表 Electrostatic Meter |
| 09/12/1990 | EP0386604A2 Static electricity meter |
| 09/12/1990 | CN2062055U Energy-saving single-phase watt-hour meter |
| 09/11/1990 | CA1274018A1 Method for processing analog output signals from current and voltage transducers and facility for carrying out the method |
| 09/07/1990 | CA2010568A1 Static electricity meter |
| 09/05/1990 | EP0385781A2 Radio frequency energy detection circuitry |
| 08/29/1990 | EP0384615A1 Biasing circuitry for a diode detector |
| 08/22/1990 | EP0382890A1 Apparent power measuring arrangement |
| 08/15/1990 | CN2060553U Electronic watt meter |
| 08/15/1990 | CN2060552U Short waveband medium/large power dynamic admeasuring apparatus |
| 08/14/1990 | US4949029 Adjustment circuit and method for solid-state electricity meter |
| 08/08/1990 | EP0380794A2 External consumption-detecting device for meter-equipped users supplied by distribution networks |
| 08/04/1990 | WO1990008952A1 Sensor |
| 08/04/1990 | CA2046630A1 Sensor |
| 08/01/1990 | CN1044344A 智能电力计量装置 Smart electricity metering devices |
| 08/01/1990 | CN1044343A Electric power-meter |
| 07/25/1990 | EP0378817A1 Sensor and device for the measurement of radiant energy, in particular the energy associated with radio-frequency, microwave and light radiation signals |
| 07/25/1990 | EP0378670A1 Adjustment circuit and method for solid-state electricity meter |
| 07/25/1990 | CN1044166A Method for instantaneously measuring a.c. quantity of electricity and device thereof |
| 07/24/1990 | US4943764 Wide dynamic range radio-frequency power sensor |
| 07/17/1990 | US4942310 Arrangement for the transformation of an electrical multiphase signal into a frequency |
| 07/11/1990 | EP0377282A1 Electronic meter digital phase compensation |
| 06/27/1990 | EP0375173A1 Electronic meter chopper stabilization |
| 06/26/1990 | US4937520 Instrument to measure the errors of apparent power meters |
| 06/26/1990 | CA1270906A1 Solid state electricity meter display |
| 06/22/1990 | CA2003604A1 Electronic watt-hour meter with combined multiplier/integrator circuit |
| 06/20/1990 | EP0373248A1 Rotary-current circuit for the supply-synchronised time control of an electrical apparatus |
| 06/13/1990 | CN1043003A Adjustment circuit and method for solid-state electricity meter |
| 06/13/1990 | CN1042999A Digital instrumentation or equipment for measuring real effective values of electric power and electric energy |
| 06/12/1990 | US4933629 Method and apparatus for optically measuring electric and magnetic quantities having an optical sensing head exhibiting the Pockel's and Faraday effects |
| 06/05/1990 | US4931725 Electronic electricity meters |
| 06/02/1990 | CA2004333A1 Electronic meter chopper stabilization |
| 05/29/1990 | CA1269713A1 Electronic electricity meters |
| 05/16/1990 | EP0368581A1 Method of compensating for frequency errors in noise power meters |
| 05/15/1990 | US4926131 Triangle waveform generator for pulse-width amplitude multiplier |
| 05/08/1990 | US4924412 For measuring electrical energy in a conductor of alternating current |
| 05/08/1990 | US4924404 Energy monitor |
| 05/02/1990 | EP0366312A1 Noise parameter test method and apparatus |
| 05/02/1990 | CN1041826A Method for measuring electric power by pulse duration modulation and current feedback |
| 05/01/1990 | US4922189 Electric power measuring devices |
| 05/01/1990 | US4922132 Radio frequency energy detection circuitry |
| 05/01/1990 | US4922123 Supply circuit for a hall sensor multiplication circuit |
| 04/24/1990 | US4920312 Multiplier |
| 04/24/1990 | CA1268215A1 Analogue, bipolar, passive multiplier |
| 04/12/1990 | DE3933707A1 Unstability compensation circuit for Hall sensor multiplier - compensates ageing of Hall sensor, nonlinearity and temp. variations |
| 04/10/1990 | US4916386 Microwave wattage indicator |
| 04/05/1990 | WO1990003558A1 Power measurement apparatus |
| 03/29/1990 | DE3919114C1 RL load effective and/or fundamental mode reactive power determn. - where mains voltage is passed via filter to zero voltage detector, load current is passed via rectifying absolute value generator, etc. |
| 03/20/1990 | US4910456 Electronic watt-hour meter with combined multiplier/integrator circuit |
| 03/15/1990 | DE3831120A1 Power measurement addition for voltmeter |
| 03/06/1990 | US4907165 Electric energy measuring method |
| 02/28/1990 | EP0201593B1 Electrical measurement process |
| 02/27/1990 | US4904995 Integrated remote electricity meter transponder and combination |
| 02/20/1990 | US4902965 Consumption meter for accumulating digital power consumption signals via telephone lines without disturbing the consumer |
| 02/20/1990 | US4902964 Program clock for an electronic demand register with automatic calibration based on sensed line frequency |
| 02/20/1990 | CA1266090A1 Power measuring apparatus |
| 02/08/1990 | DE3826551A1 Method for measuring power factors and/or reactive current |
| 01/25/1990 | WO1990000740A1 Adjustment circuit and method for solid-state electricity meter |
| 01/24/1990 | EP0076809B2 Multiple rate electrical energy metering apparatus |
| 01/23/1990 | US4896106 Watthour meter for wye connected systems |
| 01/23/1990 | US4896105 AC electric energy meter having drive circuit including stepper motor for driving mechanical register |
| 01/17/1990 | EP0351171A2 Method and apparatus for optically measuring electric and magnetic quantities |
| 01/02/1990 | CA1264183A1 Poynting vector probe for measuring electric power |
| 12/12/1989 | US4887028 Watthour meter with isolation transformers having a feedback loop |
| 11/29/1989 | CN2048590U Computer card digit electric meter |
| 11/28/1989 | US4884021 Digital power metering |
| 11/23/1989 | DE3816193A1 Method for identifying a power section of a converter of a type of converter device |
| 11/15/1989 | EP0342146A2 Electricity meter with remote communications |
| 11/14/1989 | US4881027 Circuit arrangement comprising input circuits to find a power output sum for application in multi-phase electricity meters |
| 11/14/1989 | US4881022 Method and/or apparatus for controlling the motor speed of an electric AC motor and/or a method of determining torque |
| 11/08/1989 | CN2047388U Detection table for household appliances |
| 10/31/1989 | US4878185 Digital measuring instrument |
| 10/12/1989 | DE3810157A1 Monitoring of electrical devices |
| 10/10/1989 | US4873484 Extended range composite head power sensor with three circuit branches having a common node |
| 09/26/1989 | US4870351 Electronic watt-hour meter with up and down integration for error correction |
| 09/26/1989 | CA1260555A1 Method and apparatus for converting an electrical signal into a proportional frequency |
| 09/20/1989 | EP0333197A1 Supply circuit for a Hall sensor multiplication circuit |
| 09/20/1989 | EP0332881A1 Process and appliance for digital measuring |
| 09/19/1989 | US4868893 System for remote, interactive communication with a metal under ambient sunlight conditions |
| 09/19/1989 | US4868379 Photovoltaic array with two-axis power maximization tracking |
| 09/06/1989 | EP0330933A1 Arrangement for measuring the energy of a microwave pulse |
| 09/05/1989 | US4864223 Measuring transformer to measure the current flowing in an electric conductor |
| 09/05/1989 | US4864218 Method of compensating for frequency errors in noise power meters |
| 08/29/1989 | US4862074 Polyphase volt-hour indicating circuit |