| Patents for G01R 19 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof (29,850) |
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| 04/28/1999 | EP0911637A2 Signal processing circuit for electro-optic probe |
| 04/28/1999 | EP0911636A2 Electro-optic sampling apparatus |
| 04/28/1999 | CN1215171A Auxiliary induction method transformer magnetic bias test method and apparatus thereof |
| 04/27/1999 | US5898324 High voltage detector circuit |
| 04/22/1999 | WO1999019983A1 Single supply voltage to frequency converter optimized for low voltage sensing above and below ground |
| 04/21/1999 | CN2315573Y Test pencil for automobile |
| 04/20/1999 | US5896324 Overvoltage detection circuit for generating a digital signal for a semiconductor memory device in parallel test mode |
| 04/20/1999 | US5896050 Signal generating circuit and peak detection circuit |
| 04/20/1999 | US5896035 Electric field measuring apparatus |
| 04/20/1999 | US5896033 Method and device for electronic compensation of electrical disturbance signals and use thereof |
| 04/20/1999 | US5896028 Non-contact type sensor driven from a single power supply for allowing a compact configuration and reduced power consumption |
| 04/15/1999 | WO1999009419A3 Method for voltametric measurement of very low voltage using few components |
| 04/14/1999 | EP0908734A2 Electro-optic sampling oscilloscope |
| 04/14/1999 | EP0908733A2 Electro-optic sampling oscilloscope |
| 04/14/1999 | EP0908732A2 Electro-optic sampling oscilloscope |
| 04/14/1999 | EP0904545A3 Current and voltage sensing |
| 04/14/1999 | CN2314381Y Voltage tester with automatically color-varying indicator |
| 04/14/1999 | CN2313695Y Electric iron with leakage tester |
| 04/14/1999 | CN1042985C 电路断路器 Circuit breaker |
| 04/13/1999 | US5894423 Data processing system having an auto-ranging low voltage detection circuit |
| 04/13/1999 | US5894394 Intelligent power switch and switching apparatus |
| 04/08/1999 | WO1999017129A1 Fiber optics apparatus and method for accurate current sensing |
| 04/08/1999 | WO1999017123A1 Instrument for measuring voltages of cells |
| 04/08/1999 | WO1999017122A2 Current comparator |
| 04/08/1999 | WO1999006844A3 Magnetic current sensing and short circuit detection in plate structure |
| 04/08/1999 | DE19816192A1 Electromagnetic wave analysis instrument to analyze electromagnetic wave expanding from multilayer substrate |
| 04/08/1999 | DE19740559C1 Verfahren und Vorrichtung zur Ermittlung des Ladestroms eines Akkumulators Method and device for determining the charging current of an accumulator |
| 04/08/1999 | DE19725880C1 Detector determining switched on condition of electric user loads at house mains |
| 04/07/1999 | CN2313229Y Electric current sensor |
| 04/06/1999 | US5892647 Overcurrent detection circuit |
| 04/06/1999 | US5892609 Digital signal receiver circuit |
| 04/06/1999 | US5892450 Circuit arrangement for testing the operation of a current monitoring circuit for a power transistor |
| 04/06/1999 | US5892430 Self-powered powerline sensor |
| 04/06/1999 | US5892355 Current and voltage-sensing |
| 04/06/1999 | CA2033874C Digital signal processing method and system, electric power system signal processing system and electric power control system |
| 04/01/1999 | WO1998059250A3 Electrical tester for small motor vehicles |
| 03/31/1999 | EP0904545A2 Current and voltage sensing |
| 03/31/1999 | EP0879420A4 Improved charge rate electrometer |
| 03/30/1999 | US5890097 Apparatus for waveform disturbance monitoring for an electric power system |
| 03/30/1999 | US5889659 System for estimating a load to optimize a backup energy system response |
| 03/30/1999 | US5889399 Test-point mounted fault indicator having immunity to fault currents in adjacent conductors |
| 03/25/1999 | WO1999014567A1 Method and device for determining the charging current of an accumulator |
| 03/25/1999 | DE19739322A1 Current-measuring device for electrical appliance |
| 03/24/1999 | CN2311781Y Vehicle and motorcycle fault testing and repairing electronic pen |
| 03/24/1999 | CN2311780Y 高压验电器 Pressure electroscope |
| 03/23/1999 | US5886567 Back bias voltage level detector |
| 03/23/1999 | US5886561 Backup battery switch |
| 03/23/1999 | US5886510 Circuit for diagnosing the state of an electrical load |
| 03/18/1999 | WO1999013574A1 Low power current-to-frequency converter circuit for use in implantable sensors |
| 03/18/1999 | WO1998059251A3 Method and apparatus for indicating an alternating voltage |
| 03/17/1999 | EP0902294A1 A voltage monitoring circuit |
| 03/17/1999 | CN2311002Y Electric leakage alarm device |
| 03/16/1999 | US5883578 Loss of potential determination for use in protective relays for electric power systems |
| 03/16/1999 | US5883547 Charging of a bootstrap capacitance through an LDMOS |
| 03/11/1999 | DE19736224A1 Verfahren zur Messung von kleinsten elektrischen Strömen in der Voltammetrie mit geringen Bauteilaufwand A method for measuring minute electric currents in voltammetry with low component cost |
| 03/10/1999 | EP0901058A1 Two stage current mirror |
| 03/10/1999 | EP0900418A1 Method and apparatus for sensing current in power supplies |
| 03/10/1999 | EP0900365A1 An environmentally insensitive optical sensor with improved noise cancellation |
| 03/10/1999 | EP0757859A4 Reverse current prevention circuits |
| 03/10/1999 | EP0610430B1 Analog-to-digital converter and method of fabrication |
| 03/10/1999 | CN2310326Y Sound-light double-indication low-voltage electricity tester |
| 03/10/1999 | CN1210292A Power management method in personal digital assistant |
| 03/09/1999 | US5880614 Circuit arrangement for evaluating the output signal of an active sensor |
| 03/09/1999 | US5880583 Cryogenic current comparator based on liquid nitrogen temperature superconductors |
| 03/09/1999 | US5880540 Switching apparatus with current limiting circuit |
| 03/04/1999 | DE19819495A1 Voltage monitoring device for monitoring the supply voltage to the driver circuit of a power electronic stage |
| 03/03/1999 | EP0746890B1 Method and apparatus for rms current approximation |
| 03/03/1999 | CN2309573Y Lighting test pencil |
| 03/02/1999 | US5877950 Device for measuring currents in a converter |
| 03/02/1999 | US5877652 Voltage detecting circuit and method for reduced power consumption |
| 03/02/1999 | US5877620 Method and system for analyzing and displaying waveform data |
| 02/25/1999 | WO1999009421A1 Current monitoring device |
| 02/25/1999 | WO1999009419A2 Method for voltametric measurement of very low voltage using few components |
| 02/24/1999 | EP0897542A1 Current sensor, in particular for low currents |
| 02/24/1999 | CN2308901Y Special measurer for CATV cable central power supply |
| 02/24/1999 | CN1208857A Semiconductor device |
| 02/23/1999 | US5874842 For burst communication |
| 02/23/1999 | CA2174900C Method and apparatus for measuring the change in capacitance values in dual capacitors |
| 02/23/1999 | CA2139050C Decision circuit operable at a wide range of voltages |
| 02/18/1999 | DE19733352A1 Circuit for measuring equivalent derived currents, especially for test appliance connectable to earth |
| 02/17/1999 | EP0897213A1 Monitoring of current in an inductive load, PWM driven through a bridge stage |
| 02/17/1999 | CN1208508A Connection in particular a plug-in connector for TT and TN networks |
| 02/16/1999 | US5872457 Method and apparatus for separating and analyzing composite AC/DC waveforms |
| 02/16/1999 | US5872453 Battery remaining capacity measuring apparatus |
| 02/16/1999 | CA2138822C Dc current sensor |
| 02/11/1999 | WO1999006844A2 Magnetic current sensing and short circuit detection in plate structure |
| 02/10/1999 | EP0896410A2 Overcurrent detection circuit |
| 02/10/1999 | CN2307299Y Portable ac tong-type ammeter measuring device |
| 02/09/1999 | US5869996 Semiconductor composite element, and method of detecting abnormal conditions in an inverter device having the element |
| 02/09/1999 | US5869950 Method for equalizing the voltage of traction battery modules of a hybrid electric vehicle |
| 02/04/1999 | WO1999005534A1 Device for analysing a single pulse with variable step |
| 02/04/1999 | DE19732960A1 Mechanism for analysing alternating voltage or alternating current signals |
| 02/03/1999 | CN2306514Y Overload auto-control ammeter |
| 02/03/1999 | CN2306513Y Universal test pencil |
| 02/02/1999 | US5867054 Current sensing circuit |
| 02/02/1999 | US5867020 Capacitively coupled RF voltage probe having optimized flux linkage |
| 02/02/1999 | US5867019 Power cable voltage tester |
| 02/02/1999 | US5867014 Current sense circuit having multiple pilot and reference transistors |
| 02/02/1999 | US5867001 Trim circuitry and method for accuracy in current sensing |
| 02/02/1999 | US5866957 Switching device |