| Patents for G01R 19 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof (29,850) |
|---|
| 06/08/1989 | DE3740138A1 Electronic comparator |
| 06/07/1989 | EP0319414A1 Device for signal sampling |
| 06/07/1989 | EP0319269A2 Inductive power converter |
| 06/07/1989 | EP0319095A1 Inspection apparatus incorporating digital electron detection |
| 06/07/1989 | EP0318869A1 Substrate potential detecting circuit |
| 06/07/1989 | EP0318814A2 Digital circuit testing apparatus |
| 06/07/1989 | EP0318549A1 Test meters. |
| 06/07/1989 | CN2039060U Safety energy-saving plug |
| 06/07/1989 | CN2039026U Double indicating lamps safety electricity-testing-pen |
| 06/07/1989 | CN2039024U Insulating eletronic electricity-testing-pen |
| 06/07/1989 | CN2039023U Indicators of bus-bar and slide-wire power supplies for workshop |
| 06/07/1989 | CN1033322A Integrated poly-phase power meter |
| 06/06/1989 | US4837503 Remote measurement of high voltage AC with radar |
| 06/06/1989 | CA1255393A1 Electro mechanical integrator |
| 05/31/1989 | EP0318289A2 Apparatus and method for detecting tunnel current and electro-chemical reaction |
| 05/31/1989 | CN2038673U Safety changeover socket with current leakage indicating function |
| 05/31/1989 | CN2038633U Load-on type screw-driver with voltage tester |
| 05/31/1989 | CN2038630U Magnetic field dictetor |
| 05/30/1989 | US4835652 Bi-directional DC power controller with fault protection |
| 05/30/1989 | US4835462 Means for proximal end measurement of AC voltage across distal end cable load |
| 05/24/1989 | EP0317225A2 Device for voltage testing |
| 05/24/1989 | EP0317222A2 Voltage divider circuits |
| 05/24/1989 | EP0316635A1 Optical fibre voltage sensor |
| 05/24/1989 | DE3804252C1 Low-loss voltage comparator |
| 05/23/1989 | US4833417 Synchronous demodulation system with digital output |
| 05/23/1989 | US4833403 Method and apparatus for measuring settling characteristics of a device under test by using a measurement system for measuring an input signal by sampling and digitizing said input signal |
| 05/23/1989 | US4833401 Electrical measuring instrument for high voltage power measurements |
| 05/23/1989 | US4833393 Circuit arrangement for capacitance or admittance measurement |
| 05/17/1989 | EP0316157A2 An electrically powered portable medium |
| 05/17/1989 | CN2037849U Miniature wire-clamping alternating-current display |
| 05/16/1989 | US4831328 Measurement processing arrangement |
| 05/16/1989 | US4829824 Method for digital peak value measurement for ultrasonic test pulses |
| 05/10/1989 | EP0315597A2 Analog multiplex for sensing the magnitude and sense of the current through a H-bridge stage utilizing a single sensing resistance |
| 05/10/1989 | CN2037479U Noncontact electrometrical unit |
| 05/10/1989 | CN1032867A Mageneto-sensitive type measuring instrument for intensive mageneto-leakage of ac field |
| 05/09/1989 | US4829482 Current metering apparatus for optimally inducing field emission of electrons in tunneling devices and the like |
| 05/09/1989 | US4829290 Low voltage alert circuit |
| 05/03/1989 | EP0313792A1 A full-wave peak detector device |
| 05/03/1989 | CN1032706A Induction type ammeter with measuring head |
| 05/02/1989 | US4827259 Circuit for high-frequency sampling and compression of data for high-frequency electrical transient signals superimposed in a low frequency steady-state signal |
| 05/02/1989 | US4827207 Linear load current measurement circuit |
| 05/02/1989 | US4827161 Comparator having an offset voltage cancellation circuit |
| 04/27/1989 | DE3826488A1 Method for evaluating electric sampled signals from sensors connected differentially |
| 04/26/1989 | EP0312715A1 Circuit arrangement for the determination of a frequency band-limited periodic signal |
| 04/26/1989 | CN2036674U 数字电压表 Digital voltmeter |
| 04/25/1989 | US4825350 Method and apparatus for detecting a reduction in the input voltage to a power supply |
| 04/25/1989 | US4825199 Circuit underloading monitoring system |
| 04/25/1989 | US4825150 Voltage and continuity tester |
| 04/25/1989 | US4825103 Sample-and-hold circuit |
| 04/25/1989 | US4825018 Voltage detection circuit |
| 04/24/1989 | EP0303633A4 Battery monitoring and condition indicator system for multi-battery pack. |
| 04/19/1989 | CN2036277U Non-contact multipurpose electronic electricity measurer |
| 04/18/1989 | US4823078 Device for A.C. voltage testing using a voltage multiplier and LCD display |
| 04/18/1989 | US4823073 Sensor for measuring the current or voltage of electrically conductive layers present on a reference substrate |
| 04/18/1989 | US4823026 Apparatus and method for measurement of a signal with a sampler |
| 04/18/1989 | US4823021 Circuit for detecting on/off states of switches |
| 04/13/1989 | DE3741560C1 Ignition spark detector |
| 04/12/1989 | EP0310816A1 Automatic frequency following in a corpuscular beam-measuring method using a modulated primary beam |
| 04/12/1989 | CN2035883U Tester for tyer pressure tyer pattern depth and storage battery power of automobile |
| 04/11/1989 | US4821138 Monitoring device for overhead power transmission system |
| 04/11/1989 | US4820968 Compensated current sensing circuit |
| 04/11/1989 | US4819600 Knock detection system for an internal combustion engine |
| 04/05/1989 | EP0310082A1 Evaluation method for semiconductor device |
| 04/05/1989 | EP0309956A2 Method of testing semiconductor elements and apparatus for testing the same |
| 04/05/1989 | CN2035489U Electronic working frequency detector |
| 04/04/1989 | US4818945 Non contacting volt meter |
| 04/04/1989 | US4818929 To a second voltage input comparing a first |
| 03/30/1989 | DE3820202A1 Circuit arrangement for monitoring the operation of heating or compensation components |
| 03/29/1989 | EP0309366A1 Current differentual amplifier with a sequential working anode |
| 03/29/1989 | EP0309255A1 Apparatus and process for detecting direct current magnetic flux deflections of an electrical transformer |
| 03/29/1989 | EP0294449A4 Computer-aided probe with tri-state circuitry test capability. |
| 03/29/1989 | CN2035093U Portable electroscope |
| 03/29/1989 | CN2035092U Dual electronic signal warning ligh-voltage electroscope |
| 03/28/1989 | US4816768 Electronic battery testing device |
| 03/28/1989 | US4816701 Comparing an input signal with a reference signal |
| 03/28/1989 | CA1251861A1 Bar/dot level meter |
| 03/28/1989 | CA1251834A1 Synchronization slicer |
| 03/28/1989 | CA1251833A1 Digital peak-hold circuit |
| 03/22/1989 | EP0307936A1 Multi-channel voltage detector |
| 03/21/1989 | US4815108 Signal detection apparatus |
| 03/21/1989 | US4814934 Voltage fault detector |
| 03/21/1989 | US4814933 Potential indicating device |
| 03/21/1989 | US4814696 Method and circuit arrangement for measuring in-phase and quadrature components of current in an electrical alternating current power supply |
| 03/21/1989 | US4814695 Measurement method for an electrical signal, series-parallel negative-feedback measuring circuit, as well as use of the method of the measuring circuit for measuring voltage sources with very-high-ohmage internal impedances |
| 03/21/1989 | US4814685 Inductive power converter for use with variable input and output voltages |
| 03/15/1989 | EP0306552A1 Atto-amperemeter |
| 03/14/1989 | US4812943 Current fault protection system |
| 03/14/1989 | US4812681 NMOS analog voltage comparator |
| 03/14/1989 | US4812680 High voltage detecting circuit |
| 03/09/1989 | DE3728912A1 Measuring device for measuring electrical current intensity |
| 03/09/1989 | DE3728163A1 Measuring device for determining the peak value of high AC voltages |
| 03/08/1989 | CN1031632A Isolated analog voltage sense circuit |
| 03/07/1989 | US4811191 CMOS rectifier circuit |
| 03/01/1989 | CN2033550U Multifunctional, electrotechnical insulating bar |
| 03/01/1989 | CN1031427A Dc current sensor |
| 02/28/1989 | US4809123 Ground fault detector for high-voltage DC power supplies |
| 02/28/1989 | US4808916 Power supply magnetic shunt for transmission line sensor module |
| 02/23/1989 | WO1989001633A1 Input signal determination system |
| 02/23/1989 | DE3727125A1 Method for compensating voltage variations in a magneto-resistive bridge element |
| 02/23/1989 | DE3727122A1 Method and arrangement for adjusting (balancing) a current controller |