| Patents for G01R 19 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof (29,850) |
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| 05/31/1988 | CA1237476A1 Method and circuit for evaluating an analog voltage |
| 05/25/1988 | CN87213306U Electricity tester for ship and vehicle |
| 05/24/1988 | US4747061 Automatic transfer switch for a wide range of source voltage |
| 05/24/1988 | US4746816 Spike detector circuitry |
| 05/24/1988 | US4746810 Pulse generating circuit |
| 05/18/1988 | EP0267722A2 Probability density histogram display |
| 05/18/1988 | EP0267595A1 Power supply magnetic shunt for transmission line sensor module |
| 05/17/1988 | US4745365 Digital receiver with dual references |
| 05/17/1988 | US4745362 Method and apparatus for detecting and imaging a voltage signal of at least one specific frequency at a measuring location |
| 05/17/1988 | US4745361 Electro-optic measurement (network analysis) system |
| 05/17/1988 | US4745359 Method and apparatus for determining polarity of a capacitor |
| 05/17/1988 | US4745358 Auxiliary displaying device of a digital meter display |
| 05/17/1988 | US4745309 Adjustable RMS circuit |
| 05/17/1988 | US4744671 For detecting when a target area has been hit by indirect ammunition fire |
| 05/11/1988 | EP0266519A1 Open line detector circuit |
| 05/11/1988 | DE3706786C1 Device for monitoring at least two electrical loads in motor vehicles |
| 05/11/1988 | CN87207556U Multifunction electric-phase order tester |
| 05/10/1988 | US4743779 Adjustable threshold window circuit |
| 05/05/1988 | WO1988003319A1 Electric resistor equipped with thin film conductor and power detector |
| 05/04/1988 | EP0266231A1 Device for the digital acquisition of the alternating current output from a saturated magnetic core current transformer |
| 05/04/1988 | CN87106578A Reactive power compensator with current source type ac device |
| 04/28/1988 | DE3635611A1 Partial-discharge measurement of a high-voltage transformer |
| 04/27/1988 | EP0264612A1 Current sensor and method for registering the current flux in analysing conductors |
| 04/27/1988 | CN87214780U High voltage meter |
| 04/27/1988 | CN87104460A Digital feedback double sampling a/d converter of high precision |
| 04/26/1988 | US4741002 RMS calculation circuit |
| 04/26/1988 | US4740745 Polarity and continuity tester for primary and secondary automotive circuits |
| 04/26/1988 | CA1235748A1 Replica circuit |
| 04/20/1988 | EP0263942A1 Spectrometer-detector arrangement for quantitative potential measurements |
| 04/20/1988 | CN87206212U Rotary indicator for testing high voltage |
| 04/20/1988 | CN85109355B Detector for detecting danger of advanced explosion in electric dynamite |
| 04/19/1988 | US4739252 Current attenuator useful in a very low leakage current measuring device |
| 04/19/1988 | US4739149 Current sensor for welder conductor |
| 04/14/1988 | DE3621590C1 Circuit arrangement for supplying voltage to and monitoring an electrical module |
| 04/12/1988 | US4737730 Peak detector circuit for FM measuring apparatus |
| 04/12/1988 | US4737671 Circuit for detecting the current flow of a triac |
| 04/12/1988 | US4737020 Method for making battery tester for two sizes of batteries |
| 04/06/1988 | EP0262264A1 Indicating instrument |
| 04/06/1988 | CN86106781A Test pencil |
| 04/05/1988 | US4736197 Transit system third rail warning signal |
| 04/05/1988 | US4736163 Circuit for detecting and suppressing pulse-shaped interferences |
| 04/05/1988 | US4736145 Electric control apparatus for equipment |
| 03/31/1988 | DE3632178A1 Method and device for the quick detection of power system faults |
| 03/30/1988 | EP0262056A1 Indicator for signalizing a short circuit in a lightning arrester |
| 03/30/1988 | EP0261779A1 Cw and pulse capable crystal video receiver |
| 03/30/1988 | EP0261707A1 Measuring circuit for continuous, accurate measurement of direct and alternating current |
| 03/30/1988 | CN87213555U Spark discharging signal meter |
| 03/30/1988 | CN87207248U Portable multifunctinal a.c. periodic wave meter |
| 03/29/1988 | US4734640 Welding current measuring apparatus |
| 03/29/1988 | US4734639 Master metering module with voltage selector |
| 03/29/1988 | US4734587 Optoelectric distance measuring apparatus with a time discriminator for the accurate detection of electric pulse sequence |
| 03/29/1988 | US4734576 Electro-optic sampler |
| 03/29/1988 | CA1234600A1 Power on/off reset generator |
| 03/24/1988 | WO1988002121A1 Quad exchange power controller |
| 03/23/1988 | CN87212903U Multi-functional electroscope |
| 03/22/1988 | US4733322 AC-DC transfer standard overload protection circuit |
| 03/22/1988 | US4733191 Circuit for changing a periodic intelligence signal into a direct-current signal |
| 03/16/1988 | CN85105751B Fibre-optic voltmeter (electric field) |
| 03/10/1988 | DE3727950A1 Device for carrying out voltage tests and measurements on a medium voltage or high voltage switching installation |
| 03/10/1988 | DE3629153A1 Method for detecting and recording transient and periodic events |
| 03/09/1988 | EP0258517A1 Method and device for identifying the polarity of polarized capacitors |
| 03/09/1988 | EP0258516A1 Method and device for identifying the polarity of polarized capacitors |
| 03/09/1988 | EP0258471A1 Method and device to measure motion errors of NC machine tools |
| 03/09/1988 | CN87207136U Voltage change alarm unit |
| 03/09/1988 | CN87201023U Voltage range detecting device of dc power supply |
| 03/09/1988 | CN86103773A Micro-electric current meter |
| 03/08/1988 | US4730245 Power cut detection apparatus for power converter |
| 03/08/1988 | US4730157 Circuit for the real time analysis of the energy distribution of pulses of a pulse signal |
| 03/02/1988 | EP0257200A2 Synchronized measuring amplifier |
| 03/02/1988 | EP0157799B1 Common mode signal detector |
| 03/01/1988 | US4728898 Method and apparatus for detecting and locating faults in an AC transmission line using two indicators |
| 03/01/1988 | US4728887 System for rating electric power transmission lines and equipment |
| 03/01/1988 | CA1233522A1 Electric meter with electronic rolling demand register |
| 03/01/1988 | CA1233512A1 Phase-locked sampling of a periodic signal |
| 02/25/1988 | DE3726708A1 Arrangement for testing the function of a measuring or monitoring device |
| 02/25/1988 | DE3723263A1 Device for detecting the zero crossings |
| 02/24/1988 | EP0256183A1 RMS current determination by sampling current differential |
| 02/24/1988 | CN87200169U Pincer type wattmeter |
| 02/23/1988 | US4727317 Device orientation test method suitable for automatic test equipment |
| 02/23/1988 | US4727314 Transient detector apparatus |
| 02/23/1988 | US4726661 Flexible resistive heat battery tester and holder |
| 02/18/1988 | DE3627802A1 Monitoring circuit for lines in alarm systems |
| 02/17/1988 | CN86105804A Protable set of tools for vehicles |
| 02/16/1988 | US4725765 Method and apparatus for the protection of D.C. motors under stalled conditions |
| 02/09/1988 | US4724419 Method and circuit arrangement for converting a measured voltage into a digital value |
| 02/09/1988 | US4724382 Testing instrument for detectlng alternating voltages in mains and alternating electromagnetic fields in the vicinity of voltage-carrying conductors |
| 02/09/1988 | US4724339 Low electric power consumption voltage comparison device |
| 02/04/1988 | DE3625551A1 Measuring method for digital systems |
| 02/03/1988 | EP0255143A2 Trouble detecting circuit for resistive sensor type indicator |
| 02/03/1988 | EP0254992A2 Alternating current power loss detector |
| 02/03/1988 | CN87205848U Induction electricity meter |
| 02/03/1988 | CN87203651U Shunt resistor wire device of rail circuit |
| 02/03/1988 | CN87200947U Passive audio and video voltage tester |
| 01/28/1988 | WO1988000718A1 Method for remotely detecting an electric field |
| 01/28/1988 | WO1988000717A1 Liquid crystal display |
| 01/27/1988 | EP0254443A1 Method of and apparatus for the measurement of slowly changing or static electrical polarization |
| 01/27/1988 | EP0254388A2 Frequency-measuring electrical apparatus |
| 01/27/1988 | EP0254012A2 Active load network |
| 01/26/1988 | US4721957 Ground shift compensated parameter measurement system |
| 01/26/1988 | US4721906 For determining the root mean square value or a pulsatile signal |