Patents
Sitemap › G01 - Measuring; Testing › G01R - Measuring electric variables; Measuring magnetic variables › G01R 19 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof
Patents for G01R 19 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof (29,850)
11/1980
11/26/1980EP0019279A1 Voltage comparator circuit
11/26/1980EP0019154A1 Method and circuit for continuous measurement of moisture
11/25/1980US4236178 Electron microscope with brightness/contrast indicator
11/25/1980US4236111 Method and apparatus for the measurement of electric currents and/or voltages in a plurality of current or voltage circuits
11/18/1980US4234920 Power failure detection and restart system
11/18/1980US4234863 Inductive pickup clip
11/18/1980US4234847 Fault indicator
11/18/1980CA1089951A1 Electronic system for detecting direction of motion
11/18/1980CA1089939A1 Control circuit initiating conduction of an opto- isolator unit
11/12/1980EP0018767A2 Differential amplifier
11/11/1980US4233560 Electrical apparatus for testing voltage, polarity and continuity
11/04/1980US4232383 Electronic timepiece battery monitoring circuit
11/04/1980US4232263 Measuring installation for frequency analysis of signal levels within a large amplitude range
11/04/1980CA1089015A1 Fail-safe monitor of d.c. voltage
10/1980
10/29/1980EP0018310A2 Circuitry for controlling the ratio of the values of two electrical measurement signals
10/29/1980EP0017903A1 Non-contact voltage tester
10/21/1980US4229669 Tight tolerance zero crossing detector circuit
10/21/1980CA1088216A1 Ion-controlled diode
10/21/1980CA1088196A1 Fault indicator responsive to flow of fault current in a conductor when power flow is in one direction only
10/15/1980EP0016951A1 Production of electric current flow patterns in conductors
10/14/1980US4228477 Circuit for monitoring the current distribution in parallel-connected converted branches
10/14/1980US4228399 Offshore pipeline electrical survey method and apparatus
10/07/1980US4227086 Detectors of parameters adapted to act on the force of attraction between an electret and an electrode
09/1980
09/30/1980US4225817 Combined continuity and voltage test instrument
09/30/1980CA1086828A1 Probe assembly for an electric meter
09/23/1980US4224539 FET Voltage level detecting circuit
09/23/1980CA1086417A1 Automatic threshold means and the use thereof
09/17/1980EP0015558A1 Sensing and indicating device for an insulated cable plug
09/17/1980EP0015253A1 A transducer for sensing a variable parameter and for converting a so-obtained analog signal to a digital signal.
09/16/1980US4223307 Delayed power interruption alarm
09/16/1980US4223265 High-impedance and wide-band voltage probe for the selective measurement of interference voltages
09/16/1980US4223220 Method for electronically imaging the potential distribution in an electronic component and arrangement for implementing the method
09/16/1980CA1085928A1 Electronic volt-square-hour metering method and apparatus
09/09/1980US4222087 Passive triac output asymmetry detector
09/09/1980US4222086 Overcurrent control device with fail-safe circuits
09/03/1980EP0014757A1 Power line fault detector circuit
09/02/1980US4220912 Vehicle speed control circuit tester
09/02/1980US4220877 Temperature compensated switching circuit
09/02/1980US4220854 Method for the contactless measurement of the potential waveform in an electronic component and apparatus for implementing the method
09/02/1980US4220853 Method for the contactless measurement of the potential waveform in an electronic component and arrangement for implementing the method
09/02/1980CA1085039A1 Static trip unit for circuit protective devices
08/1980
08/26/1980US4219807 Sensor system for an impressed cathodic protection circuit
08/26/1980US4219152 Dual threshold comparator circuit
08/26/1980CA1084634A1 Method of and apparatus for current-tracing the location of faults on printed circuit boards and similar systems
08/19/1980US4218736 Effective value measuring apparatus
08/19/1980US4218627 Electrical mean square voltage sensor
08/19/1980US4218140 Light meter
08/12/1980US4217651 Electrical measurements
08/12/1980US4217543 Digital conductance meter
08/12/1980US4217506 Level selective a-c monitoring circuit
08/12/1980CA1083672A1 Ground fault detector
08/12/1980CA1083670A1 Apparatus for detection of synchronism by means of vector difference measurement
08/06/1980EP0013945A1 Recorder for electric signals
08/06/1980EP0013843A1 Current intensity detector for power regulation devices in domestic electrical appliances
08/05/1980US4216502 Peak detector circuit
07/1980
07/29/1980US4215351 Chart recorders
07/29/1980CA1082814A1 Automatic comparison calibration device
07/29/1980CA1082776A1 Apparatus for monitoring an a-c variable
07/22/1980US4214210 Electromagnetic noise source locator
07/22/1980US4213702 Glass inspection method and apparatus
07/15/1980US4213125 Display system having voltage comparator circuit
07/15/1980US4213088 Voltage measuring circuit
07/15/1980US4213085 Phase inversion test device
07/15/1980CA1081787A1 Fault indicator and means for resetting the same
07/08/1980US4211971 Ratio meter for capacitive-type displacement converter
07/08/1980US4211942 Voltage comparator provided with capacitively cascade-connected inverting amplifiers
07/08/1980US4211934 Current-measuring input for an electronic relay
07/08/1980US4211237 Method and apparatus for identifying recurring signal patterns
07/08/1980CA1081330A1 Analog comparator
07/01/1980US4210862 Test device for indicating an electric voltage and/or the polarity thereof, and the passage of current through an electric conductor
07/01/1980CA1080842A1 Protection circuits
06/1980
06/25/1980EP0012665A1 Automatic correction circuit for an electrical signal emitted by a differential transducer out of balance
06/25/1980EP0012285A1 Device for emitting an optical signal dependent on an electrical parameter of an isolated cable in a power supply network
06/24/1980US4209779 Method of monitoring equipment and system for carrying out the method
06/24/1980US4209743 Circuit arrangement for measuring currents at high potential
06/24/1980CA1080363A1 Apparatus for calculating amplitude values
06/17/1980US4208627 Alarm circuit to detect shorting of periodic signal source
06/17/1980CA1079808A1 Circuit tester
06/11/1980EP0011711A1 Test device for the stepwise indication of a measurement voltage
06/10/1980US4207566 DC Current level detector for monitoring a pitot tube heater and associated method
06/10/1980US4207517 Switchless D.C. multifunction tester
06/03/1980US4206413 Dynamic threshold transient impulse energy indicator
06/03/1980US4206020 Electrochemical process using a fluidized electrode
05/1980
05/28/1980EP0011454A1 Monitoring circuits, more particularly for monitoring lamp circuits
05/27/1980US4205264 High impedance electrical testing instrument for AC and DC voltage detection and continuity testing
05/27/1980US4205240 Device for progressive electrical switching
05/27/1980CA1078458A1 Compensation indicator for attenuation probe
05/21/1980EP0015253A4 A transducer for sensing a variable parameter and for converting a so-obtained analog signal to a digital signal.
05/20/1980US4204260 Recursive percentile estimator
05/20/1980US4204243 Polarity indicating and reversing unit
05/20/1980US4204152 High and low voltage measuring apparatus employing a single display and impedance matching
05/14/1980EP0010921A1 Direct current detecting device using saturable reactors
05/13/1980US4203033 Radiation energy calibrating system and method
05/13/1980CA1077578A1 Fail-safe electronic polarized relay
05/01/1980WO1980000879A1 Control apparatus for an electrical voltage and,possibly for indicating its polarity
04/1980
04/30/1980EP0010151A1 Circuit for distinguishing between high direct or alternating voltages
04/22/1980US4199729 Variable peak detector
04/22/1980US4199728 Slope detector
04/22/1980US4199727 Malfunction detector
04/22/1980US4199716 Microwave hazard alarm
1 ... 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299