| Patents for G01R 15 - Details of measuring arrangements of the types provided for in groups , or (13,411) |
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| 12/11/1991 | EP0460696A2 Low noise pulsed light source utilizing laser diode and voltage detector device utilizing same low noise pulsed light source |
| 12/10/1991 | US5072168 Automatic scaling for display of modulation domain measurements |
| 12/03/1991 | CA1292775C Method for updating the scale factor of an apparatus using the faraday effect to measure the intensity of an alternating current |
| 12/03/1991 | CA1292766C Monitoring device for overhead power transmission system |
| 11/27/1991 | EP0458501A2 Protection of supply metering |
| 11/27/1991 | EP0458429A2 Optical measurement device |
| 11/26/1991 | US5068776 Switched-mode DC-DC power converter for reducing effects of magnetization current |
| 11/26/1991 | US5068598 Tension potential measuring circuit with selected time constant |
| 11/21/1991 | EP0457306A2 Method and device to read and write a data memory driven by a microprocessor, especially for a measuring or counting recording device |
| 11/19/1991 | US5066904 Coaxial current sensors |
| 11/19/1991 | US5066903 Optical current transformer |
| 11/13/1991 | CN2088695U Precision 12 microamper bridge type milliammeter |
| 11/12/1991 | US5065088 Current sensor circuit |
| 11/12/1991 | CA1292082C Method of making a current sensor |
| 11/06/1991 | EP0455530A1 Fibre optical measuring device, gyroscope, navigation and stabilisation system, current sensor |
| 11/06/1991 | EP0454860A1 Potential sensor using electro-optical crystal and method of measuring potential |
| 11/05/1991 | US5063350 Electrostatic spray gun voltage and current monitor |
| 11/05/1991 | US5063290 All-optical fiber faraday rotation current sensor with heterodyne detection technique |
| 10/30/1991 | EP0453693A1 Electric field pockels effect sensor |
| 10/29/1991 | CA1291533C Voltage sensor coupled to the capacitive terminal of a high voltage device bushing |
| 10/23/1991 | CN1055606A Combined instrument with electronic arithmetic circuitry for electrical-power automatization |
| 10/23/1991 | CN1055604A Wireless loss monitoring method for low-voltage circuits |
| 10/22/1991 | US5059916 Gauge driver for use with a remote sensor and having reduced offset potential response |
| 10/22/1991 | US5059910 Optical transformer |
| 10/22/1991 | US5059896 Electronic watthour meter |
| 10/22/1991 | US5059894 Electro-optic voltage measuring appartaus with single ended optics |
| 10/22/1991 | CA1291253C Sagnac type optical fibre interferometry system |
| 10/15/1991 | US5057769 AC current sensor |
| 10/09/1991 | CN1055241A 静电动态电位测量装置 Static dynamic potential measuring device |
| 10/08/1991 | US5055828 Parasitic-ground current indicator for electrical system |
| 10/08/1991 | US5055771 Faulted current indicators with improved signal to noise ratios |
| 10/08/1991 | US5055770 Method and apparatus for detecting voltage |
| 10/02/1991 | DE4010373A1 Voltage testing arrangement for conducting rails - is for medium to high voltage switching systems and contacts insulator between rail and earth with coupling electrode and rail clamp |
| 10/01/1991 | US5053915 Capacitive sensor for a circuit for measuring the potential of a line conductor in a metalclad station |
| 10/01/1991 | US5053695 Dc current monitor |
| 10/01/1991 | US5053694 Device for measuring an electric field |
| 10/01/1991 | US5053693 Fibreoptical sensor |
| 10/01/1991 | US5053617 Instrument for concurrently optically measuring thermal and electric quantities |
| 09/25/1991 | EP0448342A2 Faraday effect current sensor |
| 09/24/1991 | US5051577 Faraday effect current sensor having two polarizing fibers at an acute angle |
| 09/17/1991 | US5049809 Sensing device utilizing magneto electric transducers |
| 09/11/1991 | EP0445921A2 DC current monitor |
| 09/11/1991 | EP0445362A1 Magnetic induction measuring apparatus |
| 09/04/1991 | EP0445048A1 Current sensor for electronic trip device of a circuit breaker |
| 09/02/1991 | CA2037363A1 Current sensor for an electronic trip device |
| 08/28/1991 | EP0406276A4 Monitoring and fault protection of high voltage switchyards |
| 08/28/1991 | CN2083756U High-recision multi-function intelligent kilowatt-hour meter |
| 08/28/1991 | CN1013710B Rongnark interferometer system |
| 08/21/1991 | EP0441898A1 Optical sensing apparatus and method. |
| 08/20/1991 | US5041780 Coreless and coilless |
| 08/20/1991 | US5041761 Magnetic automotive lamp current sensor |
| 08/14/1991 | EP0440979A1 Wide angle gauge driver with resistive sensor |
| 08/14/1991 | CN1013519B Dual function dmm display |
| 08/07/1991 | CN1053684A Tension measuring circuit |
| 08/07/1991 | CN1053683A Capacitive sensor for circuit for measuring potential of line conductor in metalclad station |
| 08/06/1991 | US5038029 Optical sensor arrangement including polarization-altering sensor |
| 08/03/1991 | WO1991011724A1 Integrated optics pockels cell voltage sensor |
| 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 | EP0438616A1 Current-voltage transformer for domestic electronic power meters |
| 07/30/1991 | CA1287112C Optical interface for a magneto-optical current transducer |
| 07/24/1991 | CN2081537U Multipurpose electrician avometer |
| 07/24/1991 | CN1013307B Method for instantaneously measuring a.c. quantity of electricity and device thereof |
| 07/24/1991 | CA2034636A1 Current-voltage transformer for electronic house-service meter |
| 07/23/1991 | US5034683 Voltage detecting device |
| 07/23/1991 | US5034679 Polarization feedback control of polarization rotating sensor |
| 07/16/1991 | CA1286366C Current measuring and magnetic core compensating apparatus and method |
| 07/16/1991 | CA1286362C Testing a circuit arrangement |
| 07/11/1991 | DE4032714A1 Automatic measurement range selector for digital multi-instrument - contains parallel A=D converter and logic controlling output of measurement voltage damping element |
| 07/10/1991 | CN1052951A Automatic measuring range selector of digital multimeter |
| 07/10/1991 | CN1052950A Non-phase-detecting ac measurement and equipments thereof |
| 07/03/1991 | EP0435431A2 Automatic function selecting multimeter |
| 07/03/1991 | EP0435401A1 Parameter measuring circuit |
| 07/03/1991 | CN2080265U Cam control lockless straight key switch changeable attenuator |
| 07/03/1991 | CN2080182U Digit display high voltage meter |
| 07/03/1991 | CN2080181U Anti-false operation device of ac/dc test transformer |
| 07/02/1991 | US5029273 Integrated optics Pockels cell voltage sensor |
| 07/02/1991 | US5028865 Device having main and secondary optical sensors |
| 07/02/1991 | US5028863 High voltage measuring device |
| 06/26/1991 | EP0433970A1 Capacitive sensor for advice for measuring the potential of a conductor of a line in a shielded station |
| 06/26/1991 | EP0433824A1 Fibre-optical sensor |
| 06/25/1991 | US5027059 Differential current shunt |
| 06/25/1991 | CA1285322C Digital measuring instrument |
| 06/20/1991 | CA2032410A1 Capacite sensor for measuring the electrical potential of conducting lead in a shielded housing |
| 06/13/1991 | DE3940932A1 Measurement transducer for simultaneous measurement of AC and DC - has two soft magnetic cores, modulation coils and detection coil and uses periodic modulation current |
| 06/12/1991 | EP0431512A1 Device for measuring a voltage |
| 06/12/1991 | CN2078883U Multi-functional test pencil for multitester |
| 06/12/1991 | CN1052193A Automatic function selecting multimeter |
| 06/11/1991 | US5023948 Polarization modulation of optical signals using birefringent medium |
| 06/11/1991 | US5023684 Composite semiconductor device having function for overcurrent detection |
| 06/05/1991 | EP0430661A2 Apparatus for detecting a change in light intensity |
| 06/05/1991 | EP0430060A1 Fibre-optic current transducer |
| 06/04/1991 | US5021647 Optical fiber sensor having function of compensating for all drifting components |
| 05/30/1991 | WO1991007666A1 Potential sensor using electro-optical crystal and method of measuring potential |
| 05/29/1991 | EP0428601A1 System for measuring partial discharges. |
| 05/29/1991 | CN2078005U Multipurpose alternating-direct current high-low voltage electricity-measuring device |
| 05/28/1991 | US5020108 Audible display of electrical signal characteristics |
| 05/23/1991 | DE4025325A1 Measuring HV using two resistance chains - in which one resistor is of different value so that chains are unbalanced |
| 05/21/1991 | US5017859 Integral capacitive divider bus bar voltage measuring apparatus and combined current sensor |
| 05/21/1991 | US5017804 Hall sensing of bond wire current |
| 05/15/1991 | EP0427412A2 Current measuring method and apparatus therefor |