| Patents for G01R 19 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof (29,850) |
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| 08/21/1991 | CN2083295U Safety electroscope |
| 08/14/1991 | DE4020219A1 Mean value device for electronic measuring appts. - uses shift register outputs controlling sample-and-hold circuits coupled to adder |
| 08/14/1991 | CN1053842A Transducer for true effective value of electric energy |
| 08/13/1991 | US5039929 Automatic charger capable of charging several batteries |
| 08/08/1991 | DE4002603A1 Voltage tester with two test probes - has probes connected by single core cable and voltage measuring element and voltage indicator arranged in handles |
| 08/07/1991 | EP0439921A2 Apparatus and method of testing arbitrary waveforms |
| 08/07/1991 | CN2082420U Micro-current detecting instrument |
| 08/07/1991 | CN1053684A Tension measuring circuit |
| 08/06/1991 | US5038134 Releasing circuit for actuating vehicular safety device |
| 08/06/1991 | US5038055 Peak level detecting device and method |
| 08/03/1991 | WO1991011724A1 Integrated optics pockels cell voltage sensor |
| 07/31/1991 | EP0438689A1 Signalling device to indicate the absence of an electrical tension |
| 07/31/1991 | EP0438637A1 Method and apparatus for the determination of an effective value Ieff of a current to be measured using a Hall element and an amplifier circuit |
| 07/31/1991 | CN1053498A Electric current sensor |
| 07/24/1991 | EP0438363A1 Current measurement circuit in a MOS power transistor |
| 07/24/1991 | EP0438141A2 A device for detecting residual capacity of a battery |
| 07/24/1991 | EP0437861A2 Signal processing method and system. |
| 07/24/1991 | CN1013307B Method for instantaneously measuring a.c. quantity of electricity and device thereof |
| 07/23/1991 | US5034728 Low voltage warning apparatus and method |
| 07/23/1991 | US5034698 Dual-path wideband and precision data acquisition system |
| 07/23/1991 | US5034681 Voltage detection |
| 07/23/1991 | US5034680 Digital level display device |
| 07/17/1991 | CN1053151A Ac current collecting unit of electromechanical integration |
| 07/16/1991 | US5032840 Method of receiving pulses of the M.L.S. type and system for implementing this method |
| 07/16/1991 | US5032827 Device for monitoring a variable electric signal and a component for such a device |
| 07/11/1991 | DE4100264A1 Peak value hold circuit for video processing in scanner, - suppresses abnormal bit effects using peak value hold register, and compares with input signal |
| 07/11/1991 | CA2007630A1 Voltage and electrical continuity monitoring device |
| 07/10/1991 | EP0436222A1 Circuit for the digital measurement of an electrical signal |
| 07/10/1991 | CN2080675U Safety overload warning device for circuit |
| 07/10/1991 | CN1052952A Electric measurement without transducer and equipment thereof |
| 07/09/1991 | US5030908 Method of testing semiconductor elements and apparatus for testing the same |
| 07/09/1991 | US5030846 Zener diode detector circuit |
| 07/09/1991 | CA1285991C Input switching in electronic watthour meter |
| 07/03/1991 | EP0435371A2 Power supply device with non-symmetric monitoring |
| 07/03/1991 | CN2080180U Low voltage overhead line load detector |
| 07/03/1991 | CN1052735A Standard source type thin film coaxial thermoelectric conveter |
| 07/02/1991 | US5029273 Integrated optics Pockels cell voltage sensor |
| 07/02/1991 | US5029039 Current adaptive fault indicator |
| 07/02/1991 | US5028874 Ratiometric measurement circuit with improved noise rejection |
| 07/02/1991 | US5028865 Device having main and secondary optical sensors |
| 07/02/1991 | CA1285615C Electrical power line and substation monitoring apparatus and systems |
| 06/26/1991 | EP0433696A2 A circuit with hysteresis for power supply voltage detection |
| 06/26/1991 | CN1012999B Measuring circuit of dc component of current flowing through primary winding of output transformer of inverter |
| 06/25/1991 | US5027118 Analog signal logarithmic envelope detector |
| 06/25/1991 | US5027060 Measuring device of the rms value of a signal, notably for current measurement in a solid-state trip device |
| 06/25/1991 | US5027057 Input condition sensing circuit |
| 06/25/1991 | US5027006 Circuit for detecting a supply voltage drop and for resetting an initialization circuit |
| 06/25/1991 | CA1285322C Digital measuring instrument |
| 06/22/1991 | CA2006603A1 Device for automatically ascertaining capacitor breakdown voltage |
| 06/19/1991 | EP0433266A1 Output voltage detecting device in a laser oscillator |
| 06/19/1991 | CN2079299U Multi-function micro electric field detector |
| 06/18/1991 | US5025208 Method of measuring radio-frequency interfering voltages |
| 06/18/1991 | US5025207 Method for the measurement of a steady level in a noise-infested signal and automatic measuring device for the application of this method |
| 06/18/1991 | US5025195 Current monitoring |
| 06/18/1991 | US5025176 Peak level detection circuit |
| 06/18/1991 | US5024101 Power source circuit and bridge type measuring device with output compensating circuit utilizing the same |
| 06/18/1991 | CA1285025C Folded bar current sensor |
| 06/12/1991 | EP0431512A1 Device for measuring a voltage |
| 06/12/1991 | CN2078886U Range-adjustable induction electric properties tester |
| 06/12/1991 | CN2078884U Voltage tester for identifying several voltage grades |
| 06/12/1991 | CN1012873B Isolated analog voltage sense circuit |
| 06/12/1991 | CN1012862B Improved signal sampling device |
| 06/11/1991 | US5023684 Composite semiconductor device having function for overcurrent detection |
| 06/06/1991 | DE3939408A1 Working voltage monitor for selector banks in telephone exchange - assigns comparator to each voltage with outputs switched together for unit able to produce alarm signal |
| 06/05/1991 | EP0430707A2 Extreme level circuit |
| 06/05/1991 | EP0430661A2 Apparatus for detecting a change in light intensity |
| 06/05/1991 | EP0430354A2 Detection circuit of the current in an MOS type power transistor |
| 06/05/1991 | CN1012757B Ultrahigh voltage ac and dc electroscopic device |
| 06/05/1991 | CN1012718B Wet sand-aerating machine |
| 06/04/1991 | US5021784 Calibrated current source with ripple reduction |
| 06/04/1991 | US5021731 Thermo-optical current sensor and thermo-optical current sensing systems |
| 05/30/1991 | WO1991007666A1 Potential sensor using electro-optical crystal and method of measuring potential |
| 05/28/1991 | US5019995 Input signal discrimination method |
| 05/28/1991 | US5019936 Voltage-to-frequency squared circuit |
| 05/22/1991 | CN2077601U Plug and socket with grounding protection |
| 05/22/1991 | CA2030445A1 Measuring value converter or connection arrangement |
| 05/21/1991 | US5017876 Corona current monitoring apparatus and circuitry for A.C. air ionizers including capacitive current elimination |
| 05/21/1991 | US5017874 Method and apparatus for detecting and indicating anomalies in the operation of the ignition systems of internal combustion engines |
| 05/21/1991 | US5017855 Current controlled inverter |
| 05/21/1991 | US5017833 Pilot light assembly |
| 05/15/1991 | EP0427412A2 Current measuring method and apparatus therefor |
| 05/15/1991 | CN2077131U Multipurpose testing alarm for electrician |
| 05/15/1991 | CN1051426A Ratimetric measurement circuit with improved noise rejection |
| 05/14/1991 | US5016222 Circuit responsive to a voltage change for detecting erroneous writing into a memory |
| 05/14/1991 | US5015944 Current indicating device |
| 05/14/1991 | US5015879 Circuit for processing the signal generated by a variable-reluctance electromagnetic rotation sensor |
| 05/14/1991 | US5015878 Circuit for processing the signal generated by a variable-reluctance electromagnetic rotation sensor |
| 05/14/1991 | CA1284233C Automatic test equipment for integrated circuits |
| 05/08/1991 | EP0426297A2 Ratiometric measurement circuit with improved noise rejection |
| 05/08/1991 | EP0425875A2 Full wave rectifier/averaging circuit |
| 05/08/1991 | EP0425528A1 A real-time signal processing circuit |
| 05/08/1991 | DE4100586A1 Metal-encapsulated HV DC appts. - has electrode attached to isolating part coupled to leakage current detection circuit |
| 05/08/1991 | CN2076679U Multifunctional test pencil |
| 05/07/1991 | US5012808 Pulse generation, parameter determination, and modification system |
| 05/07/1991 | CA2027818A1 Current measuring method and apparatus therefor |
| 05/02/1991 | EP0424390A1 Voltage comparator. |
| 05/02/1991 | DE4033468A1 Indicator control circuit for vehicle, engine speed etc. - contains digitiser and digital filter with hysteresis |
| 05/02/1991 | DE3935577A1 Operating voltage monitoring circuit with hysteresis - has Schmitt trigger input stage connected to changeover device output stage |
| 04/30/1991 | US5012139 Full wave rectifier/averaging circuit |
| 04/30/1991 | US5012097 Radiation measuring apparatus |