| Patents for G01R 29 - Arrangements for measuring or indicating electric quantities not covered by groups (11,937) |
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| 01/30/1990 | CA1265186A1 Apparatus for compensating a quantization error |
| 01/24/1990 | CN2051744U High pressure multi-purpose device |
| 01/23/1990 | US4896271 Method and apparatus for measuring jitter in a periodic signal |
| 01/16/1990 | US4894607 Surface potential detecting apparatus |
| 01/16/1990 | US4893632 Method and apparatus for comparing waveform shapes of time-varying signals |
| 01/11/1990 | EP0276280A4 Method for remotely detecting an electric field. |
| 01/09/1990 | US4893082 Noise suppression in magnetic resonance imaging |
| 12/28/1989 | EP0274529A4 Liquid crystal display. |
| 12/26/1989 | US4890332 Apparatus for judging quality of mobile data communication |
| 12/19/1989 | US4888596 Method and apparatus for determining earth station parameters such as rain margin, with attenuation pads |
| 12/14/1989 | DE3819880A1 Method for determining the course of power cables under tension, and a device and two-terminal (two-port) network of periodically varying impendance for carrying out the method |
| 12/12/1989 | US4887313 Method and apparatus for making phase stable microwave measurements |
| 12/12/1989 | US4887279 Timing measurement for jitter display |
| 12/05/1989 | US4885532 Apparatus for testing multiphase outlet with visual indication of phase energization, phase rotation, and supply voltage |
| 11/28/1989 | US4884078 Antenna test and measurement system |
| 11/28/1989 | US4884031 Method and apparatus for charge distribution analysis |
| 11/23/1989 | EP0342285A1 Methods of detecting leakage of radio waves from outside an electromagnetically shielded building |
| 11/23/1989 | EP0342284A1 Electromagnetically shielded building with system for detecting leakage of radio waves thereinto |
| 11/22/1989 | CN1037424A Radio-frequency unechoic chamber |
| 11/16/1989 | DE3908846A1 Antenna arrangement |
| 11/15/1989 | EP0341691A1 Detection voltage output circuit of charge generation type sensing device |
| 11/15/1989 | EP0341669A2 Apparatus for detecting distribution of electric surface potential |
| 11/08/1989 | EP0340866A2 Device for producing x-rays pictures using photoconductors |
| 11/07/1989 | US4879507 Noise measurement probe |
| 11/02/1989 | WO1989010569A1 Method and apparatus for determining earth station parameters, such as rain margin, with attenuation pads |
| 11/02/1989 | WO1989010086A1 Electric field and temperature probe |
| 11/02/1989 | EP0340012A1 Radio-frequency anechoic chamber |
| 11/02/1989 | EP0339822A2 Transceiver testing apparatus |
| 10/31/1989 | US4878185 Digital measuring instrument |
| 10/31/1989 | US4878017 High speed D.C. non-contacting electrostatic voltage follower |
| 10/25/1989 | EP0338659A1 Frequency counter |
| 10/24/1989 | US4876655 Method and apparatus for evaluating jitter |
| 10/19/1989 | DE3811735A1 Method for measuring frequency |
| 10/19/1989 | DE3807361A1 Test device for electrical apparatus |
| 10/11/1989 | EP0335942A1 Microwave radiometer |
| 10/10/1989 | US4873574 Noise measurement for video signals |
| 10/10/1989 | US4873489 Method and apparatus for measurement of charge entrained in fluids |
| 10/10/1989 | US4873436 Nondestructive readout of a latent electrostatic image formed on an insulating material |
| 10/05/1989 | WO1989009412A1 Transition condition detector and measuring instrument utilizing the same |
| 10/04/1989 | EP0335496A2 Waveform timing alignment system for digital oscilloscopes |
| 09/26/1989 | CA1261920A1 Electronic apparatus for detecting the transient variations of an electrical voltage as a function of time |
| 09/26/1989 | CA1261410A1 Device for controlling the time interval between pulses |
| 09/21/1989 | WO1989008849A1 Harmonimeter, and methods of utilizing and constructing same |
| 09/21/1989 | WO1989008848A1 Phase noise measurement system |
| 09/20/1989 | EP0332705A1 Input signal determination system |
| 09/20/1989 | EP0225337B1 Device for the detection of corona discharges in alternating current overhead lines |
| 09/19/1989 | US4868495 Fiber optic |
| 09/19/1989 | US4868465 Determining a delay time for electron beam |
| 09/19/1989 | EP0327577A4 High voltage amplifier. |
| 09/19/1989 | CA1259670A1 Method and apparatus for editing particle produced electrical pulses |
| 09/12/1989 | US4866302 Time domain reflectometer |
| 09/07/1989 | DE3806102A1 Circuit arrangement for evaluating pulses |
| 09/05/1989 | US4864315 Phased array antenna testing arrangement |
| 09/05/1989 | US4864309 Microwave radiometer |
| 09/05/1989 | US4864282 Method and apparatus for detecting or measuring the presence of humans or biological organism |
| 09/05/1989 | US4864218 Method of compensating for frequency errors in noise power meters |
| 09/05/1989 | US4864160 Timing signal generator |
| 08/31/1989 | DE3904434A1 Anordnung zur erkennung der drehrichtung der phasen eines drehstromnetzes Arrangement for recognition of the direction of rotation of the phases of a three-phase network |
| 08/29/1989 | US4862138 Programmable comparator output filter |
| 08/29/1989 | US4860602 RF transparent thermal test chamber |
| 08/24/1989 | WO1989007768A1 Radio frequency detector |
| 08/22/1989 | US4860230 Signal recognition system |
| 08/22/1989 | US4859854 Open grid pulsed ion chamber operating in the linear ion collection region |
| 08/16/1989 | EP0327767A2 Programmable comparator output filter |
| 08/16/1989 | EP0327577A1 High voltage amplifier |
| 08/16/1989 | EP0327545A1 Determination of particle size and electric charge. |
| 08/15/1989 | US4857832 Method of and apparatus for the measurement of slowly changing or static electrical polarization |
| 08/15/1989 | US4857760 Bipolar glitch detector circuit |
| 08/15/1989 | CA1258517A1 Noise rejection in a sonic transducer |
| 08/15/1989 | CA1258499A1 Intermediate frequency amplification circuit capable of detecting a field strength with low electric power |
| 08/15/1989 | CA1258490A1 Detection apparatus |
| 08/10/1989 | DE3509356A1 Method and arrangement for detecting electromagnetic waves |
| 08/09/1989 | EP0327420A1 Device and method for measuring a short light pulse or a short electrical pulse |
| 08/03/1989 | DE3802841A1 Method for characterising optical properties of semiconductor lasers, and device for carrying out the method |
| 08/02/1989 | EP0326430A1 Static induction electric apparatus |
| 08/02/1989 | EP0326094A1 Test appliance for polyphase circuits |
| 08/02/1989 | CN2042204U High-sensitivity contactless electrometer |
| 07/25/1989 | US4852174 System and method for the identification of phase conductors |
| 07/19/1989 | EP0324134A2 Method and apparatus for measuring jitter in a periodic signal |
| 07/19/1989 | CN2041428U Ultra wide band frequency modulation noise measurer |
| 07/18/1989 | US4849685 Measuring and limiting EMI with a differential mode rejection network |
| 07/12/1989 | EP0181935B1 Microwave radiometer using fanbeam inversion |
| 07/11/1989 | US4847496 Nondestructive readout of a latent electrostatic image formed on an insulated material |
| 07/11/1989 | US4847491 Resonant loop current disturbing probe |
| 07/05/1989 | EP0322739A1 Simultaneous-delay correlator apparatus |
| 06/29/1989 | DE3743076A1 Monitoring system for machine drives |
| 06/27/1989 | US4843580 Noise immune crankshaft pulse position developing apparatus |
| 06/27/1989 | US4843309 Waveform timing alignment system for digital oscilloscopes |
| 06/21/1989 | CN2039855U Phase sequence detector for motor power supply |
| 06/20/1989 | US4841451 System for measuring the duration ratio of pulses of variable frequency |
| 06/13/1989 | US4839581 Absolute electrical potential measuring apparatus and method |
| 06/13/1989 | US4838653 Liquid crystal display with particular relationship of the capacitances |
| 06/07/1989 | EP0318807A1 Systeme for measuring the charge distribution on a photoreceptor surface |
| 06/06/1989 | US4837581 Device for the EMI testing of electronic systems |
| 06/06/1989 | US4837498 Method and apparatus for setting the signal-to-noise ratio of a carrier wave |
| 06/06/1989 | CA1255359A1 Control apparatus for the electronic detection in alternating current transmission lines of fault locations causing power losses |
| 05/31/1989 | CN2038631U Measuring apparatus for electrostatic ion |
| 05/30/1989 | US4835790 Carrier-to-noise detector for digital transmission systems |
| 05/30/1989 | US4835703 Method of compensating for noise and pulse pile-up in the counting of random pulse data |
| 05/30/1989 | US4835461 Microdeflector probe for electrostatic voltmeter |