| Patents for G01R 19 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof (29,850) |
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| 07/01/1981 | EP0031043A1 Electrophotographic copier including photoconductor charge sensing means |
| 07/01/1981 | EP0030980A1 Stabilized dc power source |
| 06/30/1981 | US4276648 Midvalue signal selection and fault detection apparatus and method |
| 06/30/1981 | US4276513 Auto-zero amplifier circuit with wide dynamic range |
| 06/30/1981 | US4276510 Apparatus for sensing current transformer primary current as a function of differential core inductance |
| 06/16/1981 | US4274143 Recirculating RMS AC conversion method and apparatus |
| 06/16/1981 | US4274056 Charge amplifier with minimum offset voltage |
| 06/16/1981 | US4274052 Current meter using core saturation |
| 06/16/1981 | US4274051 Electromagnetic arrangement for measuring electrical current |
| 06/16/1981 | US4274016 Voltage-to-current converter |
| 06/10/1981 | EP0030056A1 Influence probing arrangement and method for its realization |
| 06/10/1981 | EP0030006A1 Circuit arrangement for the remote supply of intermediate posts in a telecommunication contrivance with monitoring of the output voltage of at least one supply unit |
| 06/10/1981 | EP0029903A1 Measuring arrangement for electric currents |
| 06/09/1981 | US4272765 Microwave leakage detectors |
| 06/09/1981 | US4272759 16 Bit analog to digital converter |
| 06/09/1981 | US4272722 Determination of electric current flow patterns |
| 06/09/1981 | US4272720 Lightning discharge identification system |
| 06/03/1981 | EP0029700A1 Analog-to-digital converter |
| 06/02/1981 | US4271391 Digital voltmeter with electro-optical indication of the waveform |
| 05/26/1981 | US4269494 Battery level warning device |
| 05/26/1981 | US4269489 Camera and error preventing circuit therefor |
| 05/19/1981 | US4268764 Zero crossover detector |
| 05/14/1981 | WO1981001335A1 Method of measuring root-mean-square value of voltage |
| 05/13/1981 | EP0028454A1 Full wave rectifier |
| 05/12/1981 | US4267504 Device for measuring a quantity which influences a field-effect transistor |
| 05/12/1981 | CA1101080A1 Duration range determination of incursions by a variable signal |
| 05/12/1981 | CA1101072A1 Electrical circuit test devices |
| 05/05/1981 | US4266190 Dual core magnetic amplifier sensor |
| 05/05/1981 | US4266184 Method and apparatus for testing insulators |
| 05/05/1981 | CA1100592A1 Programmable voltage sensing circuit |
| 05/05/1981 | CA1100578A1 Meter drive circuit |
| 04/28/1981 | US4264968 Basic circuit for electronic timepieces |
| 04/28/1981 | US4264872 Differential amplifiers utilizing MIS type field effect transistors |
| 04/22/1981 | EP0027425A1 Method and apparatus to prevent tampering with the price indicated by the luminous display of an electronic taximeter and taximeter provided with such an apparatus |
| 04/21/1981 | US4263558 Phase-selective amplifier |
| 04/21/1981 | US4263550 Test point mounted circuit condition indicator |
| 04/14/1981 | US4262282 Indicator arrangement utilizing analog-digital converter |
| 04/14/1981 | US4262221 Voltage comparator |
| 04/14/1981 | CA1099409A1 Charge transfer device differencing circuit |
| 04/14/1981 | CA1099340A1 Capacitance measuring device |
| 04/07/1981 | US4260985 Resistive device sensor |
| 04/07/1981 | US4260907 Power-on-reset circuit with power fail detection |
| 04/07/1981 | CA1098976A1 Input converter |
| 03/31/1981 | US4259635 Electrical continuity and voltage testing device having a pair of probes spaced for insertion into an electrical socket |
| 03/31/1981 | US4259634 Voltmeter of the liquid crystal display type |
| 03/31/1981 | US4258736 Electrostatic monitoring system |
| 03/25/1981 | EP0025680A1 Auto-zero amplifier circuit |
| 03/24/1981 | US4258423 Microprocessor controlled digital detector |
| 03/24/1981 | US4258310 Selectively adjustable voltage detection integrated circuit |
| 03/24/1981 | US4258297 Voltage indicator for a stroboscope |
| 03/24/1981 | US4258277 Discriminator circuits |
| 03/19/1981 | WO1981000774A1 Signal selection from redundant channels |
| 03/17/1981 | US4257061 Thermally isolated monolithic semiconductor die |
| 03/11/1981 | EP0024787A1 Waveform digitizer |
| 03/10/1981 | US4255704 Zero crossing detection and electronic compensation of D. C. saturation magnetization in current transformers used in watthour meter installations |
| 03/03/1981 | US4254374 Cable tester |
| 02/25/1981 | EP0024140A1 RMS converter |
| 02/24/1981 | US4253092 Microwave leakage detector |
| 02/24/1981 | US4253057 Compensation indicator for attenuation probe |
| 02/17/1981 | US4251844 Fault indicator case and mount |
| 02/17/1981 | US4251775 Ion flux density probe |
| 02/17/1981 | US4251770 Combined fault and voltage indicator |
| 02/17/1981 | US4251744 Pulse conversion circuit |
| 02/11/1981 | EP0023752A1 Method and apparatus for accurately determining the RMS value of an unknown signal |
| 02/11/1981 | EP0023708A1 Overvoltage analyzer |
| 02/10/1981 | US4250447 Digital multimeter with more closely spaced ranges |
| 02/10/1981 | US4250446 Combination flashlight and circuit tester |
| 02/10/1981 | CA1095590A1 Electrical voltage tester having retractable elements |
| 02/03/1981 | US4249125 Portable device for testing and/or temporarily correcting circuits in a vehicle electrical system |
| 01/28/1981 | EP0022949A2 Arrangement for dose measurement |
| 01/27/1981 | US4247873 Self-adaptive, all-or-nothing converter of an analog image analysis signal |
| 01/27/1981 | US4247849 Constant current voltage sensing circuit |
| 01/22/1981 | WO1981000159A1 Output voltage-drop detecting apparatus |
| 01/20/1981 | CA1094231A1 Detectors of parameters adapted to act on the force of attraction between an electret and an electrode |
| 01/20/1981 | CA1094160A1 Multiple range peak reading voltmeter |
| 01/20/1981 | CA1094159A1 Precision measuring amplifier |
| 01/13/1981 | US4245183 RMS Circuit for voltage regulation |
| 01/13/1981 | US4245170 Detector |
| 01/13/1981 | US4245150 Power line disturbance detector circuit |
| 01/13/1981 | US4244801 Apparatus to measure the distribution of the anode currents in cells for alkali metal chloride |
| 01/07/1981 | EP0021916A1 Method of watching the instantaneous state of an electric circuit and especially of detecting a break in said circuit |
| 01/07/1981 | EP0021340A2 Apparatus for measuring and evaluating the peak values of a pulsatory voltage signal |
| 01/07/1981 | EP0021319A1 High voltage current relay |
| 01/07/1981 | EP0020898A1 An apparatus for controlling the electrical parameters of an electrode reaction in an electrochemical cell |
| 01/06/1981 | US4243945 Differential amplifier |
| 01/06/1981 | US4243931 Current isolator |
| 12/30/1980 | US4242638 Circuit for monitoring the square of the RMS value of a periodic signal |
| 12/23/1980 | US4241300 Circuit responsive to rate change in amplitude of analog electrical signal for use in tire processing apparatus |
| 12/16/1980 | US4240149 Measuring system |
| 12/16/1980 | US4240072 Load indicator for an air cleaner |
| 12/16/1980 | US4240068 CCD Analog to digital converter |
| 12/10/1980 | EP0019884A1 Circuit arrangement for supervising the operational characteristics of an excess voltage arrester without spark gap |
| 12/09/1980 | US4238811 Three phase undervoltage monitor |
| 12/09/1980 | US4238784 Electronic measuring system with pulsed power supply and stability sensing |
| 12/09/1980 | US4238728 Voltage tester housing with prod retaining channels |
| 12/09/1980 | US4237721 Apparatus and method for detecting substances and for regulating current |
| 12/09/1980 | CA1091295A1 Operational rectifier |
| 12/09/1980 | CA1091162A1 Temperature insensitive dc voltage detection and protection circuit |
| 12/02/1980 | US4236991 Electrochemical cells |
| 12/02/1980 | CA1090889A1 Level indicating system |