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4161651 |
Simultaneously sampled remote data reading and transmission system using optical fibers
A system for sampling and collecting simultaneously data from terminal apparatus installed at a plurality of data measuring locations (data sources) distributed in a system to be monitored or...
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4158170 |
Line current detector
A line current detector for use in telecommunications systems to monitor line condition. The detector uses an optical or photo electric device whose input is modulated by line current. A photo...
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4149150 |
Display device
A display device for displaying input analog quantities by lighting luminescent display elements, comprising an arithmetic circuit for dividing each of the input analog quantities into plural...
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4149149 |
Circuit for actuating a display with an improved comparator
In a display circuit for actuating a display having plural liquid crystal segments or luminescent diodes, an improved comparator is provided for determining the number of the display segments to be...
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4147979 |
Movable probe carrying optical waveguides with electro-optic or magneto-optic material for measuring electric or magnetic fields
A probe for the non-contact measurement of electric or magnetic field strengths has two wave guides provided on a substrate. One of the wave guides has a measurement portion consisting of an...
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4145653 |
Waveform analyzer for rotating electrical circuitry
Two monitor circuits, each having a light emitting diode, are connected to the inputs and outputs of an SCR current control circuit on a brushless a-c generator. The current control circuit and the...
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4144524 |
Magneto-optic bubble domain histograph incorporating gray scale weighting
A display system for providing a real-time, dynamic presentation of an analog signal waveform is disclosed. The system includes an A-D converter that, in turn, drives a serial string of binary...
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4142149 |
Control meter usable as a potentiometric or photoelectric device
A control meter is disclosed having a structural arrangement readily adaptable for usage as either a potentiometric or photoelectric type of instrument. Commonality of parts for the two types is...
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4139820 |
A.C. and D.C. voltage polarity indicator utilizing electrochromic cells
An electrochromic voltage indicator for detecting the presence and polarity of d.c. voltage, as well as for detecting the presence of a.c. voltage, includes two electrochromic cells, two contact...
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4130776 |
EL bar graph for displaying analogue measurements of temperature and the like
Each of a row of spaced, parallel, fired-on silver electrodes or bar segments on the face of a substrate has one end thereof disposed in spaced, confronting relation to one edge of an elongate...
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4126824 |
Progressively shorted tapered resistance device
A progressively shorted tapered resistance device including a body of material which undergoes an irreversible resistance decrease when heated beyond a threshold temperature in operative...
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4126825 |
Electronic current transducer for high voltage transmission lines
An electronic current transducer for high voltage transmission lines including a fast analog data channel for providing effective relaying information which is stablized by a slow, highly accurate,...
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4121153 |
Tapered resistor meter
An improved analog meter is provided having no moving parts. This meter comprises a tapered resistor device having a tapered, electrically resistive element which develops a non-uniform temperature...
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4118112 |
Method for reducing power dissipation in tapered resistor devices
A tapered resistor device which includes generally a tapered resistive film comprising a semiconducting material or other suitable material with a negative temperature coefficient of resistivity is...
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4118668 |
R.F. Network antenna analyzer employing sampling techniques and having remotely located sampling probes
The present invention relates to the combination of two conventional vector oltmeters into a single network analyzer for an antenna. The first vector voltmeter is connected to the output of an...
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4117399 |
Method and apparatus for measuring electric quantities by using light converters
To a light converter including an optical effect element is applied an electric input having an amplitude exceeding the linear region of the characteristic of the light converter. The number of the...
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4114990 |
Liquid crystal rotator
A cholesteric filled liquid crystal cell has one surface homeotropically aligned and the opposite surface homogeneous parallel aligned. Plane polarized light incident upon the homogeneous parallel...
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4112367 |
Magnetomer using a thin magnetic film optical waveguide with a.c. modulation and automatic nulling
The present invention relates to devices intended to measure magnetic fields, and also known as magnetometers. It consists in using a zeroing method to measure the influence of the Faraday effect...
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4112361 |
Liquid crystal applied voltmeter
A liquid crystal applied voltmeter in which a nematic liquid crystal is filled between a pair of light transmitting electrodes at both sides of which polaroidal plates are provided and at least one...
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4100487 |
Lightning current waveform measuring system
An apparatus for monitoring current waveforms produced by lightning strikes which generate currents in an elongated cable. These currents are converted to voltages and to light waves for being...
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4096435 |
Level indicating device
A level indicating device having a plurality of diodes connected in series and a plurality of resistors connected in series with light emitting diodes connected between corresponding junctions of...
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4091327 |
Broadband isotropic antenna with fiber-optic link to a conventional receiver
A broadband active isotropic receiving antenna for use with a conventional lectromagnetic interference receiver to measure weak near-zone electric fields of unknown polarization. The antenna...
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4070620 |
Magneto-optical high-voltage current measuring transducer
A magneto-optical measuring transducer for measuring high-voltage currents has a measuring sensing element positioned adjacent a conductor carrying the high-voltage currents to be measured. The...
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4070622 |
Magneto-optical high voltage current measuring transducer
A magneto-optical measuring transducer for measuring high voltage currents with a measurement sensing device which carries high voltage potential and is designed as a light conducting coil, with...
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4070572 |
Linear signal isolator and calibration circuit for electronic current transformer
An optical data transmission system for use with current sensors on ac high voltage transmission lines comprises a light-emitting diode transmitter at line potential and a silicon photodiode...
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4070621 |
Antenna with electro-optical modulator
A wideband, passive detector of electromagnetic fields in free space is disclosed. The apparatus is especially designed to minimize amplitude perturbations of the electromagnetic field being...
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4065716 |
Apparatus for displaying a band representation of a signal
Apparatus for displaying a band representation, e.g. a bar graph or column graph, of a signal comprises a series connected array of light-emission devices such as LED.s and a preferably constant...
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4054834 |
Device for measuring AC in a high tension line
Shunt means supply a diode bridge with an alternating current proportional to the AC to be measured. The bridge has at least two electroluminescent diodes which emit two alternating streams of...
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4039956 |
Electronic indicator
An electronic frequency indicator for an AM/FM receiver utilizing a plurality of light-emitting diodes. The intensity of the diodes is varied to achieve greater resolution for the number of diodes...
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4037153 |
Digital meters
A meter for presenting a digital display representative of an analogue input signal is disclosed in which series connected control circuits are arranged to draw current from a first constant...
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4032843 |
Compensated signal isolator
A device for coupling a signal value out of a circuit which itself is floating at some relatively high voltage (termed common-mode voltage). A sensor for converting the parameter to be measured to...
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4025845 |
System with photocouplers for automatic checking of operating thyristors
Device for the automatic checking of operating thyristors making it possible to check clearly the good condition of thyristors. It comprises photocouplers connected with resistors, arranged in...
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4017796 |
Electrical circuit means for use in analogue display and/or control systems
Analogue display apparatus comprising a chain of light emitting diodes (LED's) connected in series with a constant current source, there being respective transistor switches connected between one...
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4006414 |
Indicating device
An indicating device in the form of a thin metallic foil such as manganin on which a temperature indicating material such as Tempilaq is sprayed the foil being tapered to provide a temperature...
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4006412 |
Digital display system circuit
A digital display system is provided for visually indicating the amplitude of a received signal. A plurality of reference signals incrementally graduated from a low amplitude to a high amplitude is...
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4004220 |
Electronic voltmeter
This electronic voltmeter is particularly suited to develop volume unit output readings for appliance type electronic equipment. Seven operational amplifiers are used to selectively and separately...
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4002975 |
Electro-optic measurement of voltage on high-voltage power lines
Crystals which vary the polarization of a beam of light according to the intensity of the electrical or magnetic field in the crystal are placed in the vicinity of a high-voltage power line. A...
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3991367 |
Detection of potential on high-voltage transmission lines
A suspension insulator used on the tower of a high-voltage transmission line has a capacitive voltage dividing pickup plate placed thereon to capacitively pick up a low-power indication of the...
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3987392 |
Luminescent voltage indicator circuit
A plurality of luminescent elements, such as light-emitting diodes, incandescent lamps or the like, are located adjacent each other, each connected to the output of a difference amplifier. The...
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3980949 |
Magneto-optical measuring transducer for very high currents/voltages
A magneto-optical measuring transducer for use as a Faraday rotator in a device to measure high currents/voltages in response to a magnetic field created by the current to be measured by rotating...
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3979667 |
Electrical indicators
A domestic soil-moisture indicator of the kind including a probe comprising a pair of electrodes with spaced ends for insertion in the soil whereby the resistance of the conductive path established...
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3979743 |
Displays
A liquid crystal analogue display device has a pair of electrodes between which a nematic liquid crystal material is disposed, so that the liquid crystal is switched from a homogeneous to a...
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3969670 |
Electron beam testing of integrated circuits
Disclosed is a technique for testing functional circuit units of an integrated circuit. For each separate functional circuit unit desired to be tested, a capacitor is connected to each input while...
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3963931 |
X-ray tube current monitor
X-Ray tube monitoring apparatus comprising a shockproof housing having insulatingly disposed therein for electrical connection between the anode of an X-ray tube and a high voltage source a current...
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3964020 |
High voltage system with self-test circuitry
A high voltage system with self-test circuitry which senses the amount of current in a high voltage line and communicates this information by means of fiber optics to control electronics which in...
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3961256 |
Light-emitting semiconductor display apparatus for displaying a band representation of a voltage analog of a measured parameter
Display apparatus receives from a transducer a voltage analogue signal representing the parameter to be measured and uses the signal to produce an illuminated band-representation of the parameter...
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3952247 |
Level indicating apparatus for P.C.M. transmitting system
Level indicating apparatus includes a plurality of light emitting indicators each indicating a different level of analog signal encoded in pulse form, and two indicators responsive to the most...
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3943367 |
High frequency optically coupled differential voltage probe with logarithmic response
A voltage probe is provided for measuring high frequency transients during lectromagnetic pulse simulator testing of electronic devices. A probe tip module including input terminals for receiving...
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3939412 |
Voltage measuring device for an encapsulated high-voltage switching installation
A voltage measuring device for use with an encapsulated, high-voltage switching installation including an inner conductor within a grounded metallic outer tube. The measuring device includes means...
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3936742 |
Apparatus for measuring electrical quantities at high-voltage potential
A device for measuring an electrical quantity at high-voltage potential includes a light-wave conductor for conducting light to a measuring sensor on the high-voltage side. A reflecting surface is...
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