| Patents for G01R 19 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof (29,850) |
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| 04/24/1991 | EP0424331A1 A MOS integrated circuit with switched capacitors, having a full-wave-rectifying and integrating function |
| 04/24/1991 | EP0423987A2 Apparatus and method for extracting the RMS value from a signal |
| 04/24/1991 | EP0423918A2 Battery voltage discriminator circuit |
| 04/24/1991 | EP0423451A2 Transient current peak detector |
| 04/24/1991 | CN1050931A Multi-functional indicator lamp of one-phase and three-phase alternating current motor |
| 04/23/1991 | US5010302 Charge amplifier circuit |
| 04/17/1991 | CN2075127U Test pencil screwdriver with holder |
| 04/16/1991 | US5008613 Voltage tester for graduated optical display of a voltage and method for its manufacture |
| 04/16/1991 | US5008612 Current sensor |
| 04/16/1991 | US5008523 Current measuring circuit with means for nullifying the effects of current source and lead resistance |
| 04/10/1991 | EP0421892A1 Circuit breaker with an electronic release |
| 04/10/1991 | CN2074917U Simple charge diplaying device |
| 04/04/1991 | WO1991004495A1 Temperature-compensated apparatus for monitoring current having reduced sensitivity to supply voltage |
| 04/03/1991 | EP0419768A1 Comparator with controlled output |
| 04/02/1991 | US5005146 Signal processing method for nuclear spectrometers |
| 04/02/1991 | US5004974 Electric current sensing device |
| 04/02/1991 | US5004970 Device and a process for detecting current flow in a MOS transistor |
| 04/02/1991 | CA1282461C Method and apparatus for detection of ac power failure conditions |
| 03/28/1991 | DE4029267A1 Current measuring circuitry for frequency converter - uses currents measuring element in voltage intermediate circuit of converter to deliver pulses at set times |
| 03/27/1991 | EP0419127A2 Noise suppression system |
| 03/27/1991 | EP0419093A2 Current sensing circuit |
| 03/27/1991 | CN2074062U 高电压显示管 High voltage display tube |
| 03/27/1991 | CN2074017U A.c. high-voltage indicating installation |
| 03/26/1991 | US5003250 Voltage testing device for electric tooth-brush |
| 03/26/1991 | US5003249 Electrical power detection and indication device |
| 03/21/1991 | CA2025696A1 Noise suppression system |
| 03/20/1991 | EP0417963A2 Toothbrush with voltage tester |
| 03/20/1991 | EP0417933A2 Circuits for detecting a decrease in the voltage of a DC source |
| 03/20/1991 | EP0417873A1 Circuit for controlling a current supply device for low tension |
| 03/20/1991 | EP0417392A1 Output circuit for a potentiometer |
| 03/19/1991 | US5001726 Circuit for generating discrimination voltage level |
| 03/19/1991 | US5001416 Apparatus and method for detecting and measuring changes in linear relationships between a number of high frequency signals |
| 03/14/1991 | CA2024644A1 Circuit breaker comprising an electronic trip device |
| 03/13/1991 | EP0416589A2 Computer having a function of detecting a low-battery state |
| 03/12/1991 | US4999574 Switchable automotive circuit test light |
| 03/06/1991 | EP0415439A2 Composite semiconductor device having function for overcurrent detection |
| 03/06/1991 | EP0414795A1 Voltage controlling and indicating device. |
| 03/06/1991 | EP0223824B1 Voltage calibration in e-beam probe using optical flooding |
| 03/05/1991 | US4998098 Overvoltage detector to indicate voltage to a remote monitor |
| 02/27/1991 | EP0414039A2 Root mean square measuring circuit, in particular for measuring the effective value of an AC voltage |
| 02/27/1991 | CN1049561A Optical fibre apparatus for measuring current intensity |
| 02/26/1991 | US4996520 Overvoltage detection test apparatus for military aircraft weapons systems |
| 02/26/1991 | US4996448 Low power peak detector/buffer with fast charge-up time |
| 02/21/1991 | WO1991002396A1 Adaptive trip fault current indicator |
| 02/21/1991 | DE4020382A1 Single pole electrical voltage tester - has display element coupled to metallic test contact protruding from housing |
| 02/20/1991 | EP0413644A1 Comparator circuit for amplitude modulated high frequency signals |
| 02/20/1991 | EP0413271A2 Electric power measuring system |
| 02/19/1991 | US4994991 Digital synchronous detector sampling |
| 02/14/1991 | DE3943502A1 Oscillation maintaining circuit for HF resonance network - uses storage capacitor and controlled switch providing control signal for switch in series with resonance network |
| 02/13/1991 | CN2071342U Multifunctional current measurer |
| 02/13/1991 | CN2071118U Universal rotary tool for electrician |
| 02/13/1991 | CN1011622B Reactive power compensator with current source type ac device |
| 02/12/1991 | US4992674 Controlled slew peak detector |
| 02/12/1991 | CA1280166C Power supply magnetic shunt for transmission line sensor module |
| 02/12/1991 | CA1280164C Electronic battery testing device |
| 02/08/1991 | WO1991002395A1 Current adaptive fault indicator |
| 02/08/1991 | CA2064834A1 Current adaptive fault indicator |
| 02/08/1991 | CA2021999A1 Audible circuit tracer |
| 02/06/1991 | EP0412024A1 Device for measuring the RMS-value of a signal, especially for measuring the current in a static tripping device |
| 02/06/1991 | EP0411106A1 Thermo-optical current sensor and thermo-optical current sensing systems |
| 02/06/1991 | CN1049058A On-line overvoltage monitor for electric power system |
| 02/05/1991 | US4991015 Method and circuit arrangement for identifying the presence or absence of at least one frequency of a known value in an input signal compound of a plurality of frequencies |
| 02/01/1991 | CA2021323A1 Measuring device of the rms value of a signal, notably for current measurement in a solid-state trip device |
| 01/30/1991 | EP0410533A1 Method for receiving MLS-impulses and device for carrying out this method |
| 01/30/1991 | EP0410255A2 Circuit for the signalling technical safe assessment of a direct tension |
| 01/30/1991 | CN2070449U High-voltage charged display device |
| 01/29/1991 | US4989005 Method of analog/digital conversion |
| 01/24/1991 | WO1991001064A1 Data encodement and reading method and apparatus |
| 01/23/1991 | CN2070003U Intelligence tester for measuring out-of-balance current of electric railway section |
| 01/22/1991 | US4987323 Peak voltage holding circuit |
| 01/20/1991 | WO1991001500A1 Fibre optic arrangement for measuring the strength of an electric current |
| 01/17/1991 | DE4019810A1 Detection of AC or DC in relatively compact device - stimulating high permeability core with HF current with magnetic field shifting hysteresis curve coercivity range |
| 01/17/1991 | DE3922229A1 Measurement of voltage for A=D converter - involving digital comparison with reference voltage produced by low pass filtering square waves interactive approximation |
| 01/16/1991 | EP0408115A1 Signal-source arrangement |
| 01/16/1991 | CN2069565U High voltage electrification indicator |
| 01/16/1991 | CN2069564U Universal meter function expander |
| 01/16/1991 | CN1048601A Excess current detecting device |
| 01/15/1991 | US4985628 Inspection apparatus incorporating digital electron detection |
| 01/10/1991 | WO1991000524A1 Method and electrical arrangement for processing measurement signals |
| 01/09/1991 | EP0406312A1 Electronic battery testing device |
| 01/09/1991 | CN2069177U Ampere meter provided with protection against overcurrent and phase loss of motor |
| 01/09/1991 | CN2069119U Multi-purpose determination apparatus in electron and electric appliance |
| 01/09/1991 | CN1048471A Acquisition method and device allowing to precisely digitize analog signals |
| 01/08/1991 | US4984253 Apparatus and method for processing simultaneous radio frequency signals |
| 01/08/1991 | US4984185 Portable computer having a battery voltage detecting circuit |
| 01/08/1991 | US4984124 Faulted current indicator with inrush restraint |
| 01/08/1991 | US4983925 Signal sampling device for minimizing the errors effecting successively stored signal samples |
| 01/08/1991 | US4983911 Voltage imaging system using electro-optics |
| 01/08/1991 | US4983858 Level determining circuit generating output signal at first or second output terminal according to level of input signal |
| 01/03/1991 | DE3920648A1 Verfahren und elektrische anordnung zur messsignalverarbeitung Method and arrangement for electrical measurement signal processing |
| 01/02/1991 | EP0406080A1 Method and apparatus for registering analogue data allowing accurate digitization |
| 01/02/1991 | EP0404878A1 Transient suppressor |
| 01/02/1991 | CN2068688U High efficiency energy-saving indicator lamp |
| 01/02/1991 | CN2068687U Screw-driver bit liquid crystal test pencil |
| 01/02/1991 | CN1011081B Method for measuring arc-breaking parameter of welding ac arc and its equipment |
| 01/01/1991 | US4982443 Instantaneous voltage drop detector for DC power source |
| 01/01/1991 | US4982152 Voltage detecting device |
| 01/01/1991 | US4982151 Voltage measuring apparatus |
| 12/29/1990 | CA2020096A1 Acquisition method and device giving an accurate digitization of analog signal |
| 12/27/1990 | CA1278344C Automatic peak-to-peak amplitude measurement system |