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)
08/1990
08/29/1990CN2061295U Acousto-optic test pencil
08/28/1990US4952853 Method and apparatus for sensing direct current of one polarity in a conductor and electronically commutated motor control responsive to sensed motor current
08/23/1990WO1990005918A3 Universal output circuit
08/22/1990EP0382973A2 Voltage detection
08/22/1990CN2060893U Test pencil for automobiles
08/22/1990CN2060892U Dynamic electricity sensor of closed loop detecting optical fibers of modulated light source
08/22/1990CN1009311B Method for the elimination of the dc voltage component of a capacitive ac voltage divider
08/21/1990CA1273061A1 Active load network
08/16/1990EP0382217A2 Power source circuit and bridge type measuring device with output compensating circuit utilizing the same
08/16/1990EP0381890A1 Current monitoring
08/16/1990CA2009901A1 Cathodic protection analyzer
08/15/1990CN2060551U Mechnaical maximum current metering memory storage
08/15/1990CN1044711A Ultrahigh voltage ac & dc electroscopic device
08/14/1990US4949030 Isolated analog voltage sense circuit
08/14/1990US4949029 Adjustment circuit and method for solid-state electricity meter
08/13/1990CA2006802A1 Voltage detection
08/08/1990EP0381419A2 Improved method for determining topline and baseline of waveforms using differentiation
08/08/1990EP0381217A2 Signal level detecting circuits
08/07/1990US4947126 Ground fault current rectification and measuring circuit
08/07/1990US4947109 Detector of quantity of electricity
08/07/1990US4947108 Electric current sensing device
08/07/1990US4947033 Voltage/frequency converter and its use in an optical wave guide transmission arrangement
08/01/1990CN2059992U Car test pencil
08/01/1990CN2059991U Bar type telescopic high-voltage electroscope
08/01/1990CN1009030B Induction type ammeter with measuring head
07/1990
07/31/1990US4945441 Zero-cross point detecting circuit
07/31/1990US4945346 Audible circuit tracer
07/31/1990US4945304 Device for monitoring the unbalance of the electric power demanded
07/31/1990US4945261 Level and edge sensitive input circuit
07/25/1990EP0378670A1 Adjustment circuit and method for solid-state electricity meter
07/25/1990CN2059771U Multifunction outlet
07/25/1990CN1044166A Method for instantaneously measuring a.c. quantity of electricity and device thereof
07/24/1990US4943777 Battery voltage warning device
07/24/1990US4943769 Apparatus and method for opens/shorts testing of capacitively coupled networks in substrates using electron beams
07/24/1990US4943766 Electric quantity detecting method
07/18/1990CN2059392U Multifuncitonal tool for electrician
07/17/1990US4942310 Arrangement for the transformation of an electrical multiphase signal into a frequency
07/17/1990CA1271841A1 Resonant loop current perturbing probe
07/12/1990DE4000219A1 Semiconductor memory with externally applied programming voltage - has programming voltage detector determining its level w.r.t. preset one
07/10/1990US4941080 Full wave rectifier circuit
07/10/1990US4940944 Cathodic protection analyzer in which the fundamental and odd harmonics of a power line frequency are removed
07/04/1990EP0376897A1 A circuit for processing the signal generated by a variable-reluctance electromagnetic rotation sensor
07/03/1990US4939471 Impulse detection circuit
07/03/1990US4939448 Electric current sensing device of the magnetic field compensationtype
07/03/1990US4939447 Fiber-optic voltage sensor
07/03/1990US4939395 Temperature compensating circuit
07/03/1990US4939335 Circuit for measuring the voltage drop between the welding electrodes of a resistance welding machine
06/1990
06/28/1990DE3942167A1 Fehlererfassungseinrichtung fuer elektrische schaltungen Error detection means for electrical circuits
06/28/1990DE3843507A1 Method for measuring a pulsed current in an inductive load and device for carrying out the method
06/28/1990DE3842921A1 Circuit arrangement for monitoring the current of electrical loads
06/27/1990EP0374490A2 A voltage comparator circuit for intergrated circuit drivers of inductive electric loads
06/26/1990US4937769 Apparatus and method for reducing transient exponential noise in a sinusoidal signal
06/26/1990US4937757 Digital circuit interrupter with selectable trip parameters
06/20/1990CN2058496U Multifunctional safety device for electric measurement
06/19/1990US4935692 Vector ammeter having digital signal processing unit
06/13/1990EP0372825A2 Monolithic sampler
06/13/1990EP0372240A2 Zero voltage crossover detector for polyphase systems
06/13/1990CN2058253U High-voltage indicator with porcelain knob insulators
06/13/1990CN2058252U Acoustic induction measuring device
06/13/1990CN2058249U Single chip electric parameter measuring apparatus
06/13/1990CN1043003A Adjustment circuit and method for solid-state electricity meter
06/12/1990US4933869 Programmable threshold data detection system
06/12/1990US4933630 System for measuring phase currents in a 3-phase installation
06/12/1990US4933628 Voltage detecting device
06/06/1990EP0371192A1 Electric quantity detecting method
06/05/1990US4931724 Digital level indicating device
05/1990
05/31/1990WO1990005918A2 Universal output circuit
05/31/1990DE3939630A1 System zur erfassung von anormalitaeten bei elektrischen schaltungen System for detecting abnormalities in electrical circuits
05/30/1990EP0370963A1 Circuit for an electromagnetic rotation sensor
05/30/1990EP0370559A2 Level detector of the integratable bipolar type for high-frequency sinusoidal signals
05/30/1990EP0214239B1 Method and circuit for detecting a fault condition
05/30/1990CN2057760U Low-voltage test pen
05/29/1990US4929883 Circuit for sensing the transistor current waveform
05/29/1990US4929851 Data limiter for a radio pager
05/22/1990US4928059 Sinusoidal current sense and scaling circuit
05/16/1990EP0367981A1 Zero-crossing voltage detection
05/16/1990EP0367860A1 Amplitude measuring process of a periodic electrical signal G(t) in a band of signals U(t)
05/16/1990CN2057281U Digital test pencil for car and boat
05/16/1990CN1042240A System for measuring phase currents in 3-phase installation
05/15/1990US4926174 Digital voltmeter
05/15/1990US4926131 Triangle waveform generator for pulse-width amplitude multiplier
05/15/1990US4926043 Apparatus and method for optical measuring and imaging of electrical potentials
05/14/1990EP0282578A4 Quad exchange power controller.
05/10/1990DE3837821A1 High-precision CMOS Schmitt trigger
05/09/1990EP0367563A2 Detector of quantity of electricity
05/09/1990EP0366831A1 Temperature compensating circuit
05/08/1990US4924399 Vehicle control system with HSO-triggered output
05/08/1990US4924177 Tester for solid state electronic components
05/08/1990US4924176 Polarity indicator for vehicle battery
05/08/1990CA1268819A1 Mutual inductor current sensor
05/08/1990CA1268815A1 Superconducting current detecting circuit employing dc flux parametron circuit
05/03/1990WO1990004869A1 Transient suppressor
05/02/1990EP0366619A1 Circuit for an electromagnetic rotation sensor
05/02/1990EP0366453A2 Variable gain current-to-voltage amplifier with gain independent test mode operation
05/02/1990CN2056761U Near electrisity induction electroscope
05/02/1990CN1007778B Technique for measuring bioelectricity of group floating place
05/01/1990US4922188 Electrical peak value measuring and evaluating apparatus
05/01/1990US4922186 Voltage detector
05/01/1990US4922130 High performance track/hold for a digital multimeter
04/1990
04/25/1990CN2056514U Safty electricity test pen
1 ... 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 ... 299