| Patents for G01R 19 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof (29,850) |
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| 05/19/1987 | US4667198 Apparatus for measuring quantity of AC electricity |
| 05/19/1987 | CA1222053A1 Method and device for obtaining the peak value of a signal and application to a method and a device to determine soil hardness |
| 05/13/1987 | EP0221234A1 Apparatus for detecting power lines |
| 05/13/1987 | EP0221159A1 Gas monitor |
| 05/13/1987 | CN86208667U Two-purpose digital millivoltmeter for calibrating and measuring |
| 05/13/1987 | CN85108015A Displaying signal generating apparatus |
| 05/07/1987 | DE3538938A1 Method for obtaining an electrical measurement quantity which is proportional to the square of the rms value of an electrical signal |
| 05/06/1987 | EP0220287A1 Ac-dc transfer standard temperature sensor reversal error compensation circuit |
| 05/06/1987 | CN85105986A Method for automatically testing metals to be charged or not |
| 05/05/1987 | CA1221418A1 Method and machine for metering electric parameters |
| 05/05/1987 | CA1221410A1 Reference frequency and low voltage detector circuit |
| 04/29/1987 | EP0220064A2 Synchronization slicer |
| 04/29/1987 | EP0219701A2 Comparator circuit |
| 04/29/1987 | CN86200029U Contactless direct current ammeter |
| 04/28/1987 | US4660909 Remote grounding device for subterranean power systems |
| 04/23/1987 | WO1987002504A1 Current metering apparatus |
| 04/23/1987 | DE3538948C1 Method for digitally measuring the peak value of ultrasonic test pulses |
| 04/22/1987 | EP0218582A1 Electrical warning system for malfunctions in refrigeration |
| 04/21/1987 | US4659910 AC-DC transfer standard temperature sensor reversal error compensation circuit |
| 04/21/1987 | CA1220835A1 Measurement apparatus |
| 04/15/1987 | EP0217947A1 Battery tester and method for making the tester |
| 04/14/1987 | US4658323 RMS calculation circuit for digital circuit interrupters |
| 04/14/1987 | US4658198 Charging circuit for a reference capacitor |
| 04/14/1987 | US4658156 Voltage detection circuit for detecting input voltage larger in absolute value than power supply voltage |
| 04/14/1987 | US4658137 Electron detector |
| 04/14/1987 | CA1220525A1 Electronic circuitry with self-calibrating feedback for use with an optical current sensor |
| 04/09/1987 | DE3535118A1 Analog/digital converter |
| 04/09/1987 | DE3535102A1 Method for measuring an alternating or alternating-current bridge signal voltage at high speed and with high precision |
| 04/08/1987 | EP0067163B1 Linear full wave rectifier circuit |
| 04/08/1987 | CN85107432A Method for measuring on-line d.c. current and on-line galvanometer |
| 04/07/1987 | US4656615 Hydrophone array polarity test circuit |
| 04/01/1987 | EP0216358A2 Power cut detection apparatus for power converter |
| 04/01/1987 | EP0216178A1 CMOS input circuit |
| 04/01/1987 | EP0215810A1 Circuit for obtaining an average value. |
| 04/01/1987 | EP0058693B1 Alarm system for electric fences |
| 03/31/1987 | US4654645 Electric element breakdown detector |
| 03/31/1987 | US4654587 Digital peak detector and method of peak detection |
| 03/31/1987 | US4654584 High-speed precision equivalent time sampling A/D converter and method |
| 03/31/1987 | CA1219912A1 Tracing electrical conductors by high-frequency constant-energy-content pulse loading |
| 03/31/1987 | CA1219911A1 Tracing electrical conductors by high-frequency loading and improved signal detection |
| 03/26/1987 | DE3532661A1 Signal matching circuit |
| 03/25/1987 | CN85106595A Tool sets for repairing automatic vehicles |
| 03/18/1987 | EP0214239A1 Method and circuit for detecting a fault condition. |
| 03/17/1987 | US4651292 Temperature compensation of a linear sensor |
| 03/17/1987 | US4651105 Digital peak detecting means for a pulse train of electrical signals having a frequency within a known frequency bandwidth |
| 03/17/1987 | US4651102 Method of converting a pulse train of electrical signals into digital signals |
| 03/11/1987 | EP0213344A1 Process and circuit arrangement for measuring the active and reactive current in an AC network |
| 03/10/1987 | US4649375 For use with a crane |
| 03/10/1987 | US4649293 Clocked comparator |
| 03/10/1987 | US4649292 CMOS power-on detecting circuit |
| 03/05/1987 | DE3527021C1 Remote voltage tester |
| 03/03/1987 | US4647861 Method and means for producing a D.C. signal proportional to the peak amplitude of an A.C. signal |
| 03/03/1987 | US4647860 Apparatus for automating standard voltage reference cell intercomparisons |
| 03/03/1987 | US4647796 Multiple level voltage comparator circuit |
| 03/03/1987 | US4647793 Driver circuit for generating output at two different levels |
| 02/26/1987 | DE3528958A1 Monitoring and warning system for milk-conveying devices |
| 02/24/1987 | US4646006 Clamp mechanism for power line mounted monitoring device |
| 02/24/1987 | US4646005 Signal probe |
| 02/24/1987 | US4646004 Phase-locked sampling of a periodic signal |
| 02/24/1987 | US4646002 Circuit for high impedance broad band probe |
| 02/24/1987 | CA1218452A1 Multiprobe measuring instrument |
| 02/24/1987 | CA1218426A1 D.c. biassing of mesfets operated at high frequencies |
| 02/24/1987 | CA1218336A1 Bag dispensing package |
| 02/19/1987 | DE3529384A1 Device for monitoring a predefined voltage |
| 02/17/1987 | US4643561 Control system for an electrophotographic printing machine |
| 02/12/1987 | WO1987000928A2 Monitor for a cyclically varying parameter |
| 02/10/1987 | US4642616 Method and apparatus for detection of AC power failure conditions |
| 02/10/1987 | US4642564 Measuring circuit and method for power distribution equipment |
| 02/04/1987 | CN85205607U Testing electricity screw-driver with lighting |
| 02/03/1987 | US4641220 Test point mounted voltage monitoring system |
| 02/03/1987 | US4641090 Polyphase electrical signal measuring apparatus |
| 02/03/1987 | US4641089 Ammeter apparatus and method for capturing current readings |
| 02/03/1987 | US4641082 Six-port reflectometer |
| 01/28/1987 | EP0209688A1 Circuit for detecting the current flow of a TRIAC |
| 01/28/1987 | CN85105751A Manufacturing method of ac & dc fibre-optic voltmeter (electric field) |
| 01/27/1987 | US4639618 Spike detector circuitry |
| 01/27/1987 | US4639134 Process and circuit arrangement for amplifying an input current |
| 01/20/1987 | US4638419 Process and device for determining the mean value of the current delivered by a controllable valve rectifier bridge |
| 01/20/1987 | US4638185 Analog signal measuring apparatus |
| 01/20/1987 | CA1216890A1 Rectifier circuits |
| 01/17/1987 | CN85100829A Multichannel open-type heavy d.c. comparator |
| 01/15/1987 | WO1987000291A1 Remote sensor with compensation for lead resistance |
| 01/15/1987 | DE3524632A1 Device for forming the actual current value in three-phase current block feeding |
| 01/15/1987 | DE3524581A1 Method and circuit for the fast determination of electrical quantities of alternating-current systems |
| 01/14/1987 | CN85105762A Screw-driver with voltage tester for dangerous voltage |
| 01/13/1987 | US4637047 Level indication apparatus for digitally encoded audio signal data |
| 01/13/1987 | US4636929 Abnormal state detecting circuit of inverter |
| 01/13/1987 | US4636732 Apparatus for measuring electrical potential in a cell |
| 01/13/1987 | US4636721 Method and structure for testing high voltage circuits |
| 01/13/1987 | US4636658 Voltage detecting device |
| 01/07/1987 | EP0207800A1 Electro-optical comparator |
| 01/07/1987 | EP0207678A1 Combination of a voltage testing device and an electric tooth brush |
| 01/07/1987 | EP0207554A1 Method of and device for determining a measure of the surface potential of a medium charged by means of a corona charging device |
| 01/07/1987 | EP0207159A1 Voltage comparator of a type of low power comsumption |
| 01/07/1987 | EP0207086A1 Circuit for monitoring the electric current supply of a consumer. |
| 01/06/1987 | US4635057 Remote sensor with compensation for lead resistance |
| 01/06/1987 | US4634971 Portable hand-held voltage sensor with manually adjustable reference voltage for comparison with sensed voltage |
| 01/06/1987 | US4634895 CMOS peak detector and AC filter |
| 12/30/1986 | US4633172 In-line beam current monitor |
| 12/30/1986 | US4633168 Measuring system for determining the reactance ratio of a pair of reactive devices |