| Patents for G01R 19 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof (29,850) |
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| 09/26/1989 | US4870343 High voltage detector |
| 09/26/1989 | CA1261920A1 Electronic apparatus for detecting the transient variations of an electrical voltage as a function of time |
| 09/26/1989 | CA1260144A1 Method and circuit arrangement for converting a measured voltage into a digital value |
| 09/21/1989 | WO1989008839A1 Electronic battery testing device |
| 09/20/1989 | EP0332881A1 Process and appliance for digital measuring |
| 09/20/1989 | EP0332705A1 Input signal determination system |
| 09/19/1989 | US4868909 Signal shaping circuit utilizing a magneto-resistor in a voltage divider circuit |
| 09/19/1989 | US4868508 Trouble detecting circuit for resistive sensor type indicator |
| 09/19/1989 | US4868470 Apparatus and method for detecting a true average of N signal samples |
| 09/19/1989 | EP0318549A4 Test meters. |
| 09/19/1989 | CA1259670A1 Method and apparatus for editing particle produced electrical pulses |
| 09/14/1989 | DE3742610C1 Coupling capacitor for a voltage measuring and/or display device |
| 09/13/1989 | EP0332547A1 Current measuring circuit |
| 09/13/1989 | EP0331719A1 Light detector and signal processing circuit |
| 09/13/1989 | CN1035561A Electric current measuring arrangement |
| 09/12/1989 | US4866441 Wide band, complex microwave waveform receiver and analyzer, using distributed sampling techniques |
| 09/12/1989 | US4866389 Circuit and method for measuring battery voltage by time of discharge of a capacitor |
| 09/12/1989 | US4866373 Superconducting current detecting circuit employing DC flux parametron circuit |
| 09/12/1989 | US4866372 Voltage detector having compensation for polarization change caused by spontaneous birefringence |
| 09/12/1989 | US4866301 Controlled slew peak detector |
| 09/12/1989 | CA1259376A1 Protective control method and apparatus |
| 09/08/1989 | WO1989008266A2 Measurement of the variation in time of a periodic signal |
| 09/05/1989 | US4864224 Measuring method for determining the difference between an A-C voltage and another voltage, as well as a measuring device for carrying out the same |
| 09/05/1989 | US4864222 Voltage detector employing electro-optic material having a corner-cube shape |
| 09/05/1989 | US4864220 Voltage detector using electro-optic material and interference of light beams |
| 09/05/1989 | US4864167 Dual function peak metering circuit |
| 09/05/1989 | US4864163 Method for detecting input AC voltage |
| 08/30/1989 | EP0330177A2 Circuit for generating discrimination level voltage |
| 08/30/1989 | EP0250479A4 Current metering apparatus. |
| 08/30/1989 | CN2043762U Multifunctional non-contact detector |
| 08/30/1989 | CN2043761U Test pencil |
| 08/30/1989 | CN2043760U Portable h.v.measurer |
| 08/29/1989 | US4862287 Power line monitor and printer system |
| 08/29/1989 | US4862142 Circuit with memory for detecting intermittent changes in resistance, current, voltage, continuity, power interruption, light, and temperature |
| 08/29/1989 | US4862073 Repetitive wave sampler |
| 08/29/1989 | US4862071 High speed circuit testing apparatus having plural test conditions |
| 08/23/1989 | EP0207086B1 Circuit for monitoring the electric current supply of a consumer |
| 08/22/1989 | US4860230 Signal recognition system |
| 08/22/1989 | US4859936 Method of and apparatus for determining AC calibration errors and apparatus using device with AC calibration errors |
| 08/22/1989 | US4859932 Multi-function tester |
| 08/22/1989 | US4859872 Synchronizing signal processing circuit |
| 08/16/1989 | EP0327619A1 Electric current sensor using the faraday effect |
| 08/16/1989 | CN1034834A Judge circuit for digital circuit cutout |
| 08/16/1989 | CN1034833A Frequency doubling circuit and frequency square circuit for digital circuit cutout |
| 08/15/1989 | US4858153 Method and apparatus for fixing an instantaneous measured value |
| 08/15/1989 | US4857836 Mechanical probe for optical measurement of electrical signals |
| 08/15/1989 | US4857832 Method of and apparatus for the measurement of slowly changing or static electrical polarization |
| 08/15/1989 | US4857826 Tester system for electrical power circuits terminated at an outlet plug receptacle |
| 08/15/1989 | US4857761 Circuit for monitoring a plurality of analog quantities |
| 08/08/1989 | US4855741 Logarithmic digital level display device |
| 08/08/1989 | US4855722 Alternating current power loss detector |
| 08/08/1989 | US4855591 Electro-optical voltage detector |
| 08/03/1989 | DE3801349A1 Circuit arrangement for measuring the supply voltage |
| 08/01/1989 | US4853622 Method and apparatus for detecting and imaging a voltage signal of at least one specific frequency at a measuring location |
| 08/01/1989 | CA1258097A2 Hinge clamp for securing a sensor module on a power transmission line |
| 08/01/1989 | CA1258096A2 System and apparatus for monitoring and control of a bulk electric power delivery system |
| 08/01/1989 | CA1258095A2 Apparatus for measuring and calculating fourier components of a power line parameter |
| 07/27/1989 | DE3801952A1 Monitoring device for an electronic processing unit |
| 07/26/1989 | EP0324805A1 I?2 t MONITORING CIRCUIT |
| 07/25/1989 | US4851792 Temperature-compensated oscillator circuit |
| 07/25/1989 | US4851763 Current-measuring device, especially for determining the motor current of a direct-current motor |
| 07/25/1989 | CA1257902A1 Electrical power line parameter measurement apparatus and systems, including compact line-mounted modules |
| 07/19/1989 | CN2041429U Combined meter for electrician in automobile maintenance |
| 07/19/1989 | CN2041427U Circuit detector for automobile |
| 07/19/1989 | CN2041231U Combined safety screwdriver |
| 07/18/1989 | US4849845 Transient suppressor |
| 07/13/1989 | WO1989006365A1 Voltage indication apparatus |
| 07/13/1989 | DE3744397A1 Method and circuit for the memory-saving recording of signal curves |
| 07/12/1989 | EP0323871A2 Voltage to frequency converter and its application in a fibre optic transmission system |
| 07/11/1989 | US4847523 Lock-in test amplifier |
| 07/11/1989 | US4847518 CMOS voltage divider circuits |
| 07/11/1989 | US4847491 Resonant loop current disturbing probe |
| 07/11/1989 | CA1257330A1 Battery tester including textile substrate |
| 07/05/1989 | EP0323221A2 Instantaneous voltage drop detector for DC power source |
| 07/05/1989 | EP0322964A2 Voltage level sensing circuit arrangement |
| 07/05/1989 | EP0322734A1 Arrangement for the transformation of a voltage which varies within a wide range into a binary information signal |
| 07/05/1989 | EP0322518A1 Digital protective relay |
| 07/05/1989 | CN2040648U Digital ac voltage current transformer |
| 07/05/1989 | CN2040647U Ac electric field strength magnetic leakage measurer |
| 07/04/1989 | US4845383 High frequency voltage comparator circuit |
| 06/29/1989 | WO1989006060A1 Voltage fault detector |
| 06/29/1989 | WO1989006059A1 Current fault protection system |
| 06/29/1989 | WO1989005982A1 Power failure detector circuit |
| 06/28/1989 | CN2040254U High-voltage capacity indicator for ceramic insulator |
| 06/27/1989 | US4843325 Complementary sensing device for minimizing the effects of common mode voltages |
| 06/27/1989 | US4843310 Electricity meter with arrangement for monitoring core saturation incidents |
| 06/27/1989 | US4843307 Voltage difference measuring equipment |
| 06/27/1989 | US4843264 Dynamic sense amplifier for CMOS static RAM |
| 06/20/1989 | US4841234 Voltage detector utilizing an optical probe of electro-optic material |
| 06/20/1989 | US4841177 Comparator circuit operable for a wide range of input signal |
| 06/15/1989 | DE3741050A1 Circuit arrangement for forming the average value of periodically occurring measurement signals |
| 06/14/1989 | EP0320341A1 Measuring apparatus for electric currents using magnetic coupling |
| 06/14/1989 | CN1033425A Improved signal sampling device |
| 06/13/1989 | US4839832 Negative resistance device local extremum seeking circuit |
| 06/13/1989 | US4839788 Bipolar voltage to frequency converter |
| 06/13/1989 | US4839633 Asymmetric voltage monitor for series supplies |
| 06/13/1989 | US4839601 Directional current finder |
| 06/13/1989 | US4839584 Signal level display device for recording/reproducing apparatus |
| 06/13/1989 | US4838698 Extinction type detector |
| 06/13/1989 | US4838653 Liquid crystal display with particular relationship of the capacitances |