| Patents for G01R 19 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof (29,850) |
|---|
| 12/26/1990 | CN1048102A Device for diagnosing electric power apparatus and method |
| 12/26/1990 | CN1048101A Mechanically operated memory device for measuring maximum electric current |
| 12/26/1990 | CN1011012B Digital feedback double sampling a/d converter of high precision |
| 12/25/1990 | US4980791 Universal power supply monitor circuit |
| 12/25/1990 | US4980745 Substrate potential detecting circuit |
| 12/25/1990 | US4980634 Electric power measuring system |
| 12/19/1990 | CN2067836U Mini low-voltage test pencil with lighting and sounding means |
| 12/19/1990 | CN2067835U 接触型闪光试电笔 Contact type flash test pencil |
| 12/19/1990 | CN1010893B Non-contact voltage phase measuring means |
| 12/12/1990 | EP0402286A1 Method for testing electrical circuits of vehicles using a shunt and a control device |
| 12/12/1990 | EP0402277A1 Displaying device for an electric distributing substation |
| 12/11/1990 | US4977375 Fan operating status sensing circuit |
| 12/11/1990 | US4977367 Range selector switch for ion chamber instrument |
| 12/05/1990 | EP0400405A2 Apparatus and method for diagnosis of power appliances |
| 12/05/1990 | CN2066991U Voltage drop recorder |
| 12/05/1990 | CN2066990U Rotary automobile electricity test pen |
| 12/04/1990 | US4974602 Arrangement for analyzing local bioelectric currents in biological tissue complexes |
| 11/28/1990 | CN2066585U Circuit tester for multifunctional motor-driven vehicle |
| 11/27/1990 | US4973962 Signal level detect circuits |
| 11/27/1990 | US4973900 Voltage detecting device |
| 11/22/1990 | EP0398396A2 Voltage sensor |
| 11/22/1990 | EP0398087A2 Circuit arrangement for generating a control signal in dependence upon the occurrence of an extreme value of a sinusoidal oscillation and use of such a circuit arrangement |
| 11/21/1990 | CN2066146U Multi-functional phase-sequence test pencil |
| 11/21/1990 | CN2066144U Multi-functional electronic test pencil |
| 11/21/1990 | CN2066143U Multi-purpose test pencil |
| 11/21/1990 | CN2066142U Pointer freeze voltmeter for testing transformer |
| 11/21/1990 | CN2066141U Low-voltage test pencil |
| 11/21/1990 | CN1010532B Heat-electricity converter and its making method |
| 11/20/1990 | US4972142 Automatic frequency follow-up in particle beam metrology upon employment of a modulated primary beam |
| 11/15/1990 | DE3915706A1 Signalling relay monitoring supply voltage - comprises bistable relays controlled by drive element operated by current transformer |
| 11/15/1990 | DE3915649A1 Null voltage circuit detecting AC voltage zero crossing - contains high impedance potential divider, FET and diode controlling semiconductor element |
| 11/14/1990 | CN2065762U High-voltage ball type electricity testing device |
| 11/14/1990 | CN2065761U Liquid crystal ad/dc induction electricity testing device |
| 11/14/1990 | CN1046981A Current intensity transformer device for measuring variable electric current |
| 11/13/1990 | US4970458 AC voltage sensing for voltage regulators |
| 11/13/1990 | US4969978 Electrolytic cells |
| 11/13/1990 | CA1276234C Electrical measuring instrument for high voltage power measurements |
| 11/12/1990 | WO1990013940A1 Supply voltage circuit with controllable output power |
| 11/12/1990 | CA2064009A1 Supply voltage circuit with controllable output power |
| 11/08/1990 | DE3912923A1 Test device for revealing live conductor and polarity - has hand-held indicator unit requiring only one application of test prod. to determine voltage presence and direction |
| 11/07/1990 | EP0396446A1 Appliance for monitoring a variable electrical signal and component for this appliance |
| 11/07/1990 | CN2065326U Instrument for quick-finding electrical equipment fault of automotive vehicle |
| 11/06/1990 | US4968932 Evaluation method for semiconductor device |
| 11/06/1990 | US4968929 Plug connector coding system for electric cables |
| 11/06/1990 | US4968902 Unstable data recognition circuit for dual threshold synchronous data |
| 11/06/1990 | US4968881 Voltage detector using electro-optic material having anti-reflective coatings |
| 10/31/1990 | EP0395153A2 Circuit for supervising two operation voltages |
| 10/31/1990 | EP0394768A2 Method and device for data acquisition and compression for offnormal recording in monitoring systems |
| 10/30/1990 | US4967144 Electrical signal observing device for converting an electrical signal to be measured into an optical intensity waveform |
| 10/24/1990 | CN2064511U Current densimeters |
| 10/24/1990 | CN2064509U Current controlling meters |
| 10/23/1990 | US4965548 Level indicator with alarm |
| 10/23/1990 | US4965512 Transient current peak detector |
| 10/23/1990 | CA1275445C Voltage testing device |
| 10/23/1990 | CA1275444C Hand held device for use in both testing electrical continuity and detecting voltage sources |
| 10/18/1990 | WO1990012438A1 Voltage-to-frequency squared circuit |
| 10/18/1990 | WO1990012427A1 Energy monitor for storage cells |
| 10/18/1990 | WO1990012324A1 Voltage selector and comparator used therewith |
| 10/18/1990 | WO1990010238A3 Thermo-optical current sensor and thermo-optical current sensing systems |
| 10/18/1990 | DE3912542A1 Circuit for detecting AC current over large range - has transformer driving bistable circuit with rectangular wave detector |
| 10/17/1990 | EP0392439A1 Current transformer for measuring a variable electrical current |
| 10/17/1990 | CN2064065U Magnectic sensitive a.c/d.c mutual-inductor |
| 10/16/1990 | US4964026 Noise reduction technique for PWM controllers |
| 10/16/1990 | US4963818 Current sensor having an element made of amorphous magnetic metal |
| 10/16/1990 | US4963195 Thermocouples is connected to an silicon and germaniium alloy film; accuracy; heat resistance |
| 10/10/1990 | EP0391363A2 System for detecting voltage pulses of a particular magnitude |
| 10/10/1990 | CN2063648U Electro-optic type high-voltage, frequency measuring rod |
| 10/09/1990 | US4962353 Voltage detector |
| 10/04/1990 | WO1990011646A1 Process and device for voltage-frequency conversion |
| 10/04/1990 | DE3910212A1 Monitoring circuit for supply voltages |
| 10/03/1990 | EP0390680A1 Method and apparatus for measuring line voltage |
| 10/03/1990 | EP0389936A2 Level and edge sensitive input circuit |
| 10/02/1990 | US4961049 Magnetically-coupled apparatus for measuring electrical current |
| 09/30/1990 | CA2011903A1 Voltage-to-frequency squared circuit |
| 09/27/1990 | DE3909946A1 Circuit arrangement for evaluating an AF signal |
| 09/26/1990 | EP0389397A2 Apparatus for opens/shorts testing of capacitively coupled networks in substrates using electron beams |
| 09/26/1990 | EP0389383A2 Circuit and procedure for detecting an electric current flow in a MOS-transistor |
| 09/26/1990 | EP0389156A2 Current-to-frequency converter |
| 09/26/1990 | EP0388569A2 Circuit to detect a voltage power drop and to restore the initial circuit condition |
| 09/25/1990 | US4959642 Instrumentation loop-powered backlit liquid crystal display |
| 09/25/1990 | US4959608 Apparatus and method for extracting the RMS value from a signal |
| 09/25/1990 | US4959558 Circuit arrangement for detecting cross-over by an alternating voltage of a fixed reference voltage level |
| 09/19/1990 | CN2062456U Electric testing pen |
| 09/19/1990 | CN2062455U Charged displayer for high voltage electric apparatus |
| 09/18/1990 | US4958139 Method and apparatus for automatically calibrating the gain and offset of a time-shifted digitizing channel |
| 09/18/1990 | US4958124 Multi-channel voltage detector |
| 09/12/1990 | EP0386804A2 Arrangement for measuring a quiescent current of an integrated monolithic digital circuit, integrated monolithic digital circuit provided with such an arrangement and testing apparatus provided with such an arrangement |
| 09/12/1990 | EP0386272A1 Current sensor circuit |
| 09/12/1990 | EP0386167A1 Pilot light assembly |
| 09/12/1990 | CN2062057U Multi-function phase-sequence testing pen |
| 09/12/1990 | CN2062054U Pure electric resistance load detector |
| 09/12/1990 | CN2061885U 组合旋具 Combination screwdriver |
| 09/12/1990 | CN1045298A Multiple channel coupled bias magnetic comparator |
| 09/11/1990 | US4956610 Current density measurement system by self-sustaining magnetic oscillation |
| 09/11/1990 | US4956600 High frequency current detector for a low frequency line |
| 09/11/1990 | US4956568 Monolithic sampler |
| 09/07/1990 | WO1990010238A2 Thermo-optical current sensor and thermo-optical current sensing systems |
| 09/05/1990 | EP0385469A2 Potential detecting circuit |
| 09/04/1990 | US4954773 Voltage measurement with an electron probe without external trigger signal |
| 08/29/1990 | EP0384615A1 Biasing circuitry for a diode detector |