Patents
Sitemap › G01 - Measuring; Testing › G01R - Measuring electric variables; Measuring magnetic variables › G01R 19 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof
Patents for G01R 19 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof (29,850)
01/1990
01/17/1990CN2051149U Multifunction electrician screwdriver
01/16/1990US4894608 Electric current sensor using the faraday effect
01/11/1990WO1990000327A1 High frequency current detector for a low frequency line
01/11/1990EP0276280A4 Method for remotely detecting an electric field.
01/10/1990EP0350299A2 Bi-directional DC power controller with fault protection
01/04/1990DE3821805A1 Method for acquisition and reduction of data for interference level detection in monitoring systems
01/03/1990EP0349205A2 Differential analog comparator
01/03/1990EP0349028A2 Integrated semiconductor circuit comprising a differential pair of FETs
01/03/1990EP0348965A2 Load voltage detecting device for use in an apparatus for supplying a current variable with time to a load section
01/03/1990EP0348478A1 Voltage fault detector
01/03/1990EP0348416A1 Zener diode detector circuit.
01/03/1990CN2050614U Interval voltmeter
01/02/1990US4891627 Device for detecting object
01/02/1990US4891580 Electro-optic measurements of voltage waveforms on electrical conductors
01/02/1990US4891579 Voltage detector
01/02/1990CA1264182A1 Traction load meter system
12/1989
12/28/1989EP0274529A4 Liquid crystal display.
12/27/1989EP0348123A1 Method and apparatus for automatically calibrating the gain and offset of a time-shifted digitizing channel
12/27/1989CN2050172U Test pencil distinguishing alternating current and direct current low potential
12/27/1989CN2050171U Music induction test pencil
12/26/1989US4890095 Circuit arrangement for automatically monitoring several analog electric signals
12/26/1989US4890014 Sequential operation differential current amplifier
12/26/1989US4890013 Circuit for sensing voltages beyond the supply voltage of the sensing circuit
12/20/1989EP0346937A1 Circuit for sensing voltages beyond the supply voltage of the sensing circuit
12/20/1989EP0346386A1 Electro-optic measurement (network analysis) system
12/14/1989DE3819370A1 Device for measuring direct current
12/14/1989DE3818455A1 Peak voltage meter
12/13/1989EP0346182A1 Physical parameter measuring device using a mobile sensor
12/13/1989EP0345621A2 High speed CMOS comparator with hysteresis
12/13/1989EP0345473A2 Circuit for measuring the voltage difference between the welding electrodes of a resistance-welding machine
12/13/1989CN2049363U Electroscope with indicating meter
12/13/1989CN2049362U High voltage presence displaying device
12/13/1989CN2049361U Multipurpose test pencil
12/13/1989CN1037980A Universal test and control module and its system
12/12/1989US4887026 Voltage detector for detecting a voltage developing in a selected area of an object
12/07/1989DE3817527A1 Circuit arrangement for a level detector
12/06/1989EP0344986A2 Electrical signal observing device
12/06/1989EP0344794A2 Apparatus and method for processing simultaneous radio frequency signals
12/06/1989EP0344479A1 Optical indicator of the operational status of an energy supply network conductor which is inaccessible due to insulation or encapsulation
12/05/1989US4885656 Digital protective relay
12/05/1989US4885532 Apparatus for testing multiphase outlet with visual indication of phase energization, phase rotation, and supply voltage
11/1989
11/30/1989WO1989011748A1 Voltage controlling and indicating device
11/29/1989EP0343579A2 Releasing circuit for actuating vehicular safety device
11/29/1989EP0343578A2 Releasing circuit for actuating vehicular safety device
11/29/1989EP0343392A2 Arrangement for displaying a variable quantity from a driven semiconductor
11/29/1989CN2048591U Contactless electric tester
11/29/1989CN2048589U Tester pen of multitester
11/29/1989CN2048588U Thermoelectric convertor
11/28/1989US4884022 Voltage testing device attachable to the blade terminals of a power meter
11/28/1989US4883987 Comparator circuit having a fast recovery time
11/23/1989EP0343056A1 Automatic charger for batteries or accumulators
11/23/1989EP0343055A1 Automatic charger capable of charging several batteries
11/23/1989EP0342736A1 Phase-locked-loop cicuit and bit-detection arrangement comprising such a phase-locked-loop circuit
11/22/1989CN2048193U Multi-functional digital high-pressure gauge
11/21/1989US4882538 Device for detecting current flowing in an electric wire
11/15/1989EP0342144A2 Voltage sensitive switch
11/14/1989US4881024 Voltage sensitive switch
11/09/1989DE3807147A1 Verfahren und anordnung zur messung des zeitlichen verlaufs eines periodischen signals mit hoher zeitaufloesung nach einem boxcar-aehnlichen verfahren The method and process arrangement for measuring the temporal course of a periodic signal with high time resolution according to a similar boxcar
11/08/1989CN2047388U Detection table for household appliances
11/08/1989CN2047386U Optical fiber voltage sensing head with high-stability
11/08/1989CN2047385U Mutli-functional vehicle and ship test pencil
11/07/1989US4879509 Zero-phase-sequence voltage sensing apparatus
11/02/1989WO1989008266A3 Measurement of the variation in time of a periodic signal
11/01/1989CN2047026U Electronic luminescence sounding test pencil
11/01/1989CN1005651B Displaying signal generating apparatus
10/1989
10/31/1989US4878185 Digital measuring instrument
10/31/1989US4878026 Measuring circuit of the DC component of the current flowing through the primary winding of the output transformer of an inverter
10/25/1989EP0338489A2 Power line monitorng circuit
10/25/1989CN2046631U Domestic electric source indicator
10/25/1989CN2046630U A.c. current detecting device
10/25/1989CN2046424U Test screw-driver bit for vehicle
10/24/1989US4876689 Output voltage detecting device in a laser oscillator
10/24/1989US4876654 True RMS power demodulation system and method for a modulated RF signal
10/24/1989US4876517 Circuit for sensing FET or IGBT drain current over a wide dynamic range
10/24/1989US4876502 Wide dynamic range current measuring apparatus
10/24/1989US4876500 User carried sensor for detecting displacement relative to the ground
10/19/1989WO1989009910A1 Pilot light assembly
10/18/1989CN2046226U Liquid crystal screw -driver with voltage tester
10/18/1989CN2046225U Multifunction screw-driver with voltage tester
10/18/1989CN2046223U Electric power electronic electroscope
10/18/1989CN2046221U Ultrasonic remote control digital microammeter
10/18/1989CN1036458A Device for detecting current
10/17/1989US4875152 Electrical tap switch
10/17/1989US4875006 Ultra-high-speed digital test system using electro-optic signal sampling
10/17/1989US4874969 High speed CMOS comparator with hysteresis
10/12/1989DE3810157A1 Monitoring of electrical devices
10/12/1989DE3809436A1 Method and device for detection of current and automatic prevention of missetting of the nominal current values in electric motors
10/11/1989CN2045856U Intelligent direct-current voltameter
10/11/1989CN1036299A Heat-electricity converter and its making method
10/10/1989US4873512 Active shaft grounding and diagnotic system
10/04/1989EP0335634A2 Integrated circuit incorporating a voltage detector circuit
10/04/1989EP0335460A1 An improved circuit arrangement for detecting cross-over by an alternating voltage of a fixed reference voltage level
10/04/1989CN2045498U Light-emitting diode test pencil
10/04/1989CN2045496U Liquid crystal test pencil capable of measuring voltage range
09/1989
09/28/1989DE3817499C1 Method for the measurement of broadcast interference
09/27/1989EP0333711A1 Current detection device having an extended frequency range of response
09/27/1989CN2045115U Multipurpose test pencil for repair of automobile
09/27/1989CN2045114U Multifunctional electroscope for power driven vehicles
09/27/1989CN1035896A Ac converter
09/26/1989US4870349 Digital level indicating device
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