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| Number | Title | Issue Date |
| 5898307 | Independent cursor control in dual-trace engine analyzer scope An engine analyzer having a dual-trace digital oscilloscope display provides a discrete waveform plot area for each trace and displays in each plot area a cursor array which may selectively include one or two vertical-line cursors which can be selectively... | 04/27/1999 |
| 5869959 | Spectrum analyzer A spectrum analyzer includes a synchronizing signal input terminal (27A) and a sweep control signal generator (32) inserted between the synchronizing signal input terminal (27A) and a ramp address generator (23). In the case of making a frequency analysis... | 02/09/1999 |
| 5841286 | Oscilloscope with detection of anomalous events during blind intervals An oscilloscope comprises a trigger circuit for initiating display of the waveform of an input signal in response to a trigger event, at least one detection circuit responsive to the input signal for detecting occurrence of an anomalous event therein, and... | 11/24/1998 |
| 5793195 | Angular distribution probe Ion-beam probes of the planar, screened, and multilayer types are shown and described. These probes can detect the arrival of energetic ions and, in the latter type, also detect the arrival of energetic neutral molecules. A specific improvement is the use... | 08/11/1998 |
| 5767686 | Device for contactless detection of the position of a moving web The present invention relates to a device for the contactless detection of the position of a moving webs. The web has on one side of the web a detector electrode covering its entire width and on the other side in the area of the web edges transmission ele... | 06/16/1998 |
| 5754056 | Charge detector with long integration time The invention relates to an apparatus and method for detecting electrical charge with a long integration time and in particular to a sampling method which reduces noise that affects the accuracy of the measurement of the total charge. The apparatus sample... | 05/19/1998 |
| 5747984 | Switching component for detecting contact erosion Switching components with contact parts that are mounted on a contact carrier in a switch housing may include devices for monitoring the contact erosion. The contact carrier may be split (sub-divided) and contact parts can be slotted at the rear and mount... | 05/05/1998 |
| 5729145 | Method and apparatus for detecting arcing in AC power systems by monitoring high frequency noise Arcing in an AC power system is detected by monitoring the power waveform for wideband high-frequency noise, and examining the detected noise for patterns of variation in its amplitude synchronized to the power waveform. A narrowband, swept-frequency dete... | 03/17/1998 |
| 5726576 | Microwave sensor for detecting a discharge occurring in an electrical apparatus A microwave sensor includes a case 1 of an object apparatus in which a discharge may occur; the object apparatus 2; an antenna 3 which is attached to the object apparatus case 1 and receives a microwave signal generated by a discharge; a signal processing... | 03/10/1998 |
| 5723975 | Apparatus and method for converting a voltage waveform into an optical signal An apparatus and method for converting a voltage waveform into an optical signal is usable in a multi-channel, electromagnetically transparent, voltage probe transmission link system to monitor simultaneously a plurality of voltage signal waveforms of a d... | 03/03/1998 |
| 5712559 | Cathodic protection reference cell and corrosion sensor A combination and unitary corrosion monitor and reference cell for cathodic protection systems includes an elongated tubular metal element of the same material as the structure to be protected and a reference cell on one end of the tubular element, adapte... | 01/27/1998 |
| 5712573 | Network analyzer with adaptable sweep time between measurement points In a network analyzer for the measurement of frequency-dependent measurement parameters of an object undergoing measurement, the waiting period at which the locked oscillator is switchable between the successive frequency measurement points is controlled ... | 01/27/1998 |
| 5705930 | Gas path electrostatic sensor A sensor installable within a gas turbine engine for sensing electrostatic charge therein. The sensor comprises a sensing plate and first and second shielding plates. The sensing plate has a first face with a first peripheral portion, and a second face wi... | 01/06/1998 |
| 5694051 | Inspecting transistors in an inverter circuit A method and apparatus for inspecting a transistor in an inverter circuit includes turning on only the transistor of the inverter circuit. A predetermined collector current is supplied to the transistor until a transistor junction temperature reaches a pr... | 12/02/1997 |
| 5663650 | Portable grain moisture meter A portable grain moisture meter has a large 16 character digital display allowing an alphabetical list of grain selections to be selectably displayed in full text format and subsequently tested for moisture content with the test results also displayed on ... | 09/02/1997 |
| 5661403 | Apparatus and method for testing a solid electrolyte An apparatus and method for measuring conduction current through a sample portion of the surface of the solid conductor that is in contact with a liquid conductor, such as the solid electrolyte of a liquid-solid-liquid battery, is provided. The apparatus ... | 08/26/1997 |
| 5656931 | Fault current sensor device with radio transceiver A fault current sensor device detects and distinguishes abnormal current events on alternating current overhead and underground power transmission lines. The sensor distinguishes whether the momentary or sustained fault is a line-to-ground fault, line-to-... | 08/12/1997 |
| 5656932 | Non-contact type wave signal observation apparatus A non-contact type wave signal observation apparatus measures transfer functions of a distributed constant network. A signal is input from a network analyzer to the network to be measured. Electromagnetic waves radiated from the network are received at ea... | 08/12/1997 |
| 5656928 | Surrounding state measuring apparatus utilizing an impedance element Measuring apparatus includes a first element having its impedance dependant on the state of its surroundings and a second element having a variable impedance connected to the first element. A voltage at the connection point between the first and second el... | 08/12/1997 |
| 5654641 | Method and device for testing the effectiveness of a lighting ground system The invention concerns a method for verifying the effectiveness at a given measurement location of a lightning ground system including at least one pick-up member connected to a ground conductor. The method includes the steps of feeding a current to at le... | 08/05/1997 |
| 5654642 | System and method of use for conducting a neutral corrosion survey A system and method for testing underground electric cables, while in service, for active corrosion and degree of neutral loss. The method is conducted by applying a non-harmonic selected frequency signal to the neutral(s) of the underground cable connect... | 08/05/1997 |
| 5652522 | Dielectric-loaded surface-condition sensor and method A dielectric-loaded, microwave sensor which can detect dielectric coatings, e.g., air, water and ice, on a road surface. The sensor includes an antenna having an aperture and also includes a dielectric member with a lower surface and an upper surface. The... | 07/29/1997 |
| 5648722 | Apparatus and method for determining the state of an electrical switch within an HVAC system An apparatus and method for determining the state of a switch for use in an HVAC system. The apparatus and method are advantageously configured for use within a heating, ventilation and air conditioning (HVAC) system, in which the sensing of the state of ... | 07/15/1997 |
| 5646534 | Battery monitor for electric vehicles A battery monitor for monitoring the voltage and temperature of the batteries associated with a battery pack of an electric vehicle. The battery monitor includes an opto-isolator that electrically separates an isolated portion of the battery monitor conne... | 07/08/1997 |
| 5646541 | Apparatus and method for measuring circuit network A circuit network measuring apparatus applies a measurement signal from a signal source to a device under test and measures circuit parameters of the device under test from the measurement signal and an output signal of the device under test. The apparatu... | 07/08/1997 |
| 5646539 | Multi-purpose capacitive sensor An apparatus for sensing two parameters of a hydraulic system having a hydraulic line includes a pair of electrodes contained within the line and oppositely spaced, forming a capacitor. The apparatus alternately produces first and second charging currents... | 07/08/1997 |
| 5644240 | Differential conductivity hemodynamic monitor A flow rate of a fluid flowing in a tube is quantitatively determined by altering the electrical conductivity of the fluid by injection of a bolus of saline. The electrical conductivity of the altered conductivity is measured over the time it takes the al... | 07/01/1997 |
| 5644242 | Armature winding and winding connection test methods A single source of energy is used to determine up to four armature coil or winding resistances and effectively up to four armature winding weld resistances for each test connection or index position of an armature being tested to thereby reduce the test t... | 07/01/1997 |
| 5644243 | Detector power linearity requirements and verification techniques for TMI direct detection receivers A system (36, 98) for determining the linearity of an RF detector (46, 106). A first technique involves combining two RF signals from two stable local oscillators (38, 40) to form a modulated RF signal having a beat frequency, and applying the modulated R... | 07/01/1997 |
| 5642053 | Fluid identification sensor A sensor can detect the difference in potential between itself and the fluid into which it is immersed, a signal generated by the probe representing this difference in potential. This signal is used to activate an oscillator circuit. By varying the condit... | 06/24/1997 |
| 5642039 | Handheld vector network analyzer A handheld vector network analyzer (VNA) providing a wide bandwidth test signal FO utilizing a narrowband test signal synthesizer which provides the test signal through a frequency divider or harmonic generator. With a 550-1100 MHz narrowband t... | 06/24/1997 |
| 5631552 | Hemodynamic monitor for detecting air bubbles The presence of air bubbles entrained in a liquid flowing through a tube is detected flowing the liquid through a conduit which comprises a conductivity cell with a continuous path configuration. An electrical current is induced in the liquid in the condu... | 05/20/1997 |
| 5627472 | Condition tester for a battery A tester for determining the condition of an electrochemical power source, e.g. a battery or main cell, is disclosed. The tester may comprise an electrolytic (coulometric) cell connected in series to a auxiliary cell. The auxiliary cell is a miniature ele... | 05/06/1997 |
| 5627476 | Milliohm impedance measurement An impedance probe circuit and method presents a balanced load to a DC or RF voltage source and to two voltage measurement nodes. The impedance probe circuit is accurate for measurement of an impedance device X which has a range always less than the value... | 05/06/1997 |
| 5625292 | System for measuring the integrity of an electrical contact Disclosed is a system that determines whether pins of electrical components such as connectors, switches, and sockets are present and properly soldered to a printed circuit board. The system uses an oscillator which supplies a signal, typically ten kilohe... | 04/29/1997 |
| 5619144 | Detector and method for observation of the presence of a liquid and/or of a change of phase in same Detector and method for detecting the presence of a liquid, such as water dew or of ice, or for detecting a change of phase in liquid, based on a change in an electrical resistance. The detector comprises a substrate onto whose face one or several resisto... | 04/08/1997 |
| 5617018 | Device for measuring a wide range of voltages and for determining continuity An electrical test device for use by an electrician in testing circuits. The device includes a voltage sensor, display, and steady current source. The voltage sensor monitors the type of voltage (AC or DC) between the two conductors, and provides a signal... | 04/01/1997 |
| 5614830 | Oil monitor with magnetic field A method and apparatus for detecting the degree of deterioration in lubricating oil including a grid-like capacitive sensor, that uses the lubricating oil as a dielectric medium, and a magnetic field imposed upon the oil to attract ferromagnetic wear part... | 03/25/1997 |
| 5612616 | Device for measuring a wide range of voltages and for determining continuity An electrical test device for use by an electrician in testing circuits. The device includes a voltage sensor, display, and steady current source. The voltage sensor monitors the type of voltage (AC or DC) between the two conductors, and provides a signal... | 03/18/1997 |
| 5610528 | Capacitive bend sensor A capacitive bend sensor includes a first element having a comb-patterned portion of conducting material, and a second element having a comb-patterned portion of conducting material. A dielectric material is disposed between the comb-patterned portion of ... | 03/11/1997 |
