| Patents for G01R 19 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof (29,850) |
|---|
| 11/02/1988 | EP0288977A1 Current comparison circuit |
| 11/01/1988 | US4782422 I2 t monitoring circuit |
| 11/01/1988 | CA1244139A1 Microwave waveform receiver |
| 10/27/1988 | DE3711818A1 Method and device for the isolated measurement of direct current and alternating current |
| 10/26/1988 | EP0288016A2 Comparator with enlarged range for input common mode signal |
| 10/26/1988 | EP0287886A1 Circuit for monitoring several analogous magnitudes |
| 10/26/1988 | CN88102068A Device for measuring electric current by the faraday effect implemented in a sagnac interferometer |
| 10/25/1988 | US4780668 Method and an electronic circuit for measuring very weak signals at high voltage |
| 10/25/1988 | US4780660 Apparatus for compensating reactive power by current-source type converter |
| 10/25/1988 | US4779708 Control device for an elevator |
| 10/19/1988 | CN88203018U Avo meter for vehicles |
| 10/18/1988 | US4779045 Automatic peak-to-peak amplitude measurement system |
| 10/18/1988 | US4779044 Voltage, current and frequency measuring of non-standard waveforms |
| 10/18/1988 | US4779042 Computer-aided probe with tri-state circuitry test capability |
| 10/18/1988 | US4779040 Method and apparatus for recognizing the polarity of polarized capacitors |
| 10/12/1988 | EP0286282A2 Method for detecting input ac voltage |
| 10/12/1988 | CN87214947U Peak voltage measuring apparatus |
| 10/12/1988 | CN87210135U High voltage brake pullrod with voltage tester |
| 10/12/1988 | CN87102521A Automatic calibrating type weak-current meter |
| 10/05/1988 | EP0284909A2 Sensor for measuring the current or the voltage of electric conductive layers on a reference chip |
| 10/05/1988 | EP0284771A2 Device and method for an optical measurement or/and imaging of electrical potentials |
| 10/04/1988 | US4775832 Conductor tracer transmitter with non-reversing magnetic field tracing signal |
| 09/28/1988 | EP0284214A1 Electric current measurement |
| 09/28/1988 | CN87207323U Instrument on line for high-voltage alternating current |
| 09/27/1988 | US4774621 For sampling an AC voltage and/or current in an electric power system |
| 09/22/1988 | WO1988007286A1 Zener diode detector circuit |
| 09/22/1988 | DE3718305C1 Circuit for monitoring the level of alternating-voltage signals |
| 09/21/1988 | EP0282578A1 Quad exchange power controller |
| 09/20/1988 | CA1242247A1 Multiple level voltage comparator circuit |
| 09/15/1988 | DE3806649A1 Device for monitoring at least two electrical loads in motor vehicles |
| 09/15/1988 | DE3706632A1 Device for testing free or connected cable conductors, in particular telephone conductors |
| 09/14/1988 | CN87209980U Liquid crystal screw-driver with voltage tester |
| 09/13/1988 | US4771233 Printed curcuit board lead ammeter |
| 09/07/1988 | WO1988006810A1 Device for detecting output voltage of a laser oscillator |
| 09/07/1988 | WO1988006737A1 Electro-optic measurement (network analysis) system |
| 09/07/1988 | CN88101525A Electric current measurement |
| 09/07/1988 | CN87216354U Surface used current and voltage measuring instrument for low-voltage networks |
| 09/06/1988 | US4769613 Digitalized amplitude detection circuit for analog input signal |
| 08/31/1988 | EP0280501A1 Instantaneous voltage drop detector |
| 08/31/1988 | EP0280261A2 Circuit for getting a temperature independent rectangular signal from a measuring signal |
| 08/30/1988 | US4768215 X-ray generator with current measuring device |
| 08/30/1988 | CA1241385A1 Arrangement for determining the starting instant of the leading edge of a high-frequency pulse |
| 08/17/1988 | EP0278637A2 Automatic peak-to-peak amplitude measurement system |
| 08/17/1988 | EP0278193A1 Circuit for measuring the DC component of the primary winding current of the output transformer of an inverted rectifier |
| 08/17/1988 | EP0278147A1 Earth monitoring apparatus |
| 08/17/1988 | CN88200808U Tester for drawing-motor armature |
| 08/17/1988 | CN87209867U Non-battery test pencil with sound effect |
| 08/10/1988 | EP0277468A1 Method and apparatus for detecting and indicating anomalies in the operation of the ignition systems of internal combustion engines, particularly for motor vehicles provided with catalytic silencers |
| 08/09/1988 | US4763068 Method, circuit and apparatus for the elimination of the d.c. voltage components of a capacitive a.c. voltage divider |
| 08/09/1988 | US4763054 Level detector |
| 08/03/1988 | EP0276280A1 Method for remotely detecting an electric field. |
| 08/03/1988 | CN87206211U Integrated warning unit of warner |
| 08/02/1988 | US4761605 Current sensor |
| 08/02/1988 | CA1239994A1 Test point mounted voltage monitoring system |
| 08/02/1988 | CA1239993A1 Micropower dc voltage indicator |
| 08/02/1988 | CA1239989A1 Apparatus for detecting power lines |
| 07/28/1988 | DE3807305A1 Binary current and voltage monitor for self-commutated converter systems |
| 07/27/1988 | EP0275862A2 Installation for detecting imbalance |
| 07/27/1988 | EP0275548A1 Voltage comparator circuit |
| 07/27/1988 | CN88100365A Controlling apparatus of elevator |
| 07/26/1988 | US4760287 Voltage comparator circuit |
| 07/26/1988 | US4760286 Comparator with input offset current elimination |
| 07/26/1988 | CA1239664A1 Measuring circuit and method for power distribution equipment |
| 07/20/1988 | EP0274995A1 A circuit for the linear measurement of a current flowing through a load |
| 07/20/1988 | EP0274787A1 Device for delivering an output signal corresponding to the maxima or minima of a variable input signal |
| 07/20/1988 | EP0274529A1 Liquid crystal display. |
| 07/20/1988 | CN88100072A Measuring circuit of dc component of current flowing through primary winding of output transformer of inverter |
| 07/20/1988 | CN87209290U Multifunctional true effective value voltagemeter |
| 07/19/1988 | US4758749 CMOS current sense amplifier |
| 07/14/1988 | WO1988005227A1 Digital receiver with dual references |
| 07/14/1988 | DE3702624C1 Device for determining defined trigger points |
| 07/13/1988 | CN87108294A Digital receiver with dual references |
| 07/12/1988 | US4757420 Electromagnetic contactor with wide range overload current relay board utilizing left shifting and method |
| 07/06/1988 | EP0273196A2 Multi-level pattern detector for a single signal |
| 07/06/1988 | CN87216537U Simple and safety screw-driver with voltage tester |
| 07/06/1988 | CN87108371A Computer-aided probe with tri-state circuitry test capability |
| 07/05/1988 | US4755805 Current sensing alarm arrangement for monitoring the presence of high voltage |
| 07/05/1988 | US4755758 Wave formatter for a logic circuit testing system |
| 07/05/1988 | US4755696 CMOS binary threshold comparator |
| 07/05/1988 | US4755665 Light detector and signal processing circuit |
| 06/30/1988 | WO1988004781A1 Computer-aided probe with tri-state circuitry test capability |
| 06/30/1988 | WO1988004776A1 Battery monitoring and condition indicator system for multi-battery pack |
| 06/28/1988 | US4754224 Circuit arrangement for converting an input voltage into a proportional output signal |
| 06/28/1988 | CA1238686A1 Method and device for measuring an electric quantity average value related to a series of periodic wave trains |
| 06/22/1988 | EP0271601A1 Synchronous demodulator with digital output |
| 06/22/1988 | CN87215524U Digital high pressure meter |
| 06/22/1988 | CN87212469U Test pen for indicating voltage level |
| 06/22/1988 | CN87204146U Safety warning device for mains voltage |
| 06/21/1988 | US4752728 Tunable resonant sensing means to sense a particular frequency in a high energy charged particle beam and generate a frequency-domain signal in response |
| 06/21/1988 | US4752700 Apparatus for pre-defining circuit characteristics |
| 06/15/1988 | EP0271294A1 Knock detection circuit |
| 06/15/1988 | EP0270798A1 Apparatus for selective signal counting |
| 06/15/1988 | CN87208317U Detecting device for electricity leakage and illicit electricity using |
| 06/08/1988 | EP0269827A1 Digital measuring apparatus |
| 06/08/1988 | CN87211248U Magneto-sensitive instrument for measuring ac field strength and magnetic leakage |
| 06/07/1988 | US4749944 Load detecting device for generator |
| 06/07/1988 | US4749880 Circuit for detecting level of input voltage |
| 06/01/1988 | DE3700368C1 Digital oscilloscope |
| 05/31/1988 | US4748401 Method and apparatus for recognizing the polarity of polarized capacitors |
| 05/31/1988 | US4748348 Multi-level pattern detector for a single signal |