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7577044 |
Resistive memory element sensing using averaging
A system for determining the logic state of a resistive memory cell element, for example an MRAM resistive cell element. The system includes a controlled voltage supply, an electronic charge...
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7564250 |
Pulsed methods and systems for measuring the resistance of polarizing materials
A system and method for measuring resistance of a polarizing material are disclosed. The system includes a voltage divider circuit having a first resistive element of known resistance and the...
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7483735 |
Apparatus and method for monitoring body composition by measuring body dielectric constant and body impedance based on the method of frequency digital sampling
A method for measuring dielectric constant of body endermic tissues and body impedance based on the method of frequency digital sampling and for evaluating body composition is provided, inputting...
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7372717 |
Methods for resistive memory element sensing using averaging
A system for determining the logic state of a resistive memory cell element, for example an MRAM resistive cell element. The system includes a controlled voltage supply, an electronic charge...
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7250777 |
Method and device for measuring resistance
A device for measuring a resistance includes a comparator. A D-type flip-flop has its D input connected to the output of the comparator and its latch input connected for receiving a pulse signal at...
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7176695 |
Method and apparatus for measuring transfer characteristics of a semiconductor device
A method and apparatus is provided for measuring alternating current (AC) and direct current (DC) characteristics of a plurality of semiconductor devices. A ring oscillator generates pulses to...
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6930495 |
Digitizing ohmmeter system
A digitizing ohmmeter system for providing a digital resistance measurement includes a current source for providing an excitation current to an impedance-varying input sensor and an ADC circuit...
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6882157 |
Method and device for diagnosing trouble with sensor function
A sensor for converting a physical quantity into an electric signal and issuing the output is driven by a drive circuit which is driven by a drive signal issued from a 1-chip microcomputer. The...
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6832507 |
System for detecting the presence of moisture
The system comprises at least one electronic sensor for detecting the presence of moisture. The system further comprises at least one reading device for obtaining information from the sensor about...
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6822462 |
Self-adapting method for inhibiting corrosion of a component of a marine vessel through the use of an impressed current
A self-adapting method for inhibiting corrosion of a component of a marine vessel performs a monitoring step during which a signal from the electrode is compared to a predetermined threshold...
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6784669 |
Electrical circuit arrangement for converting an electrical input variable into an impressed output electrical voltage
An electrical voltage arrangement to be provided with selectively different electrical input variables, for example in the form of a unidirectional voltage, a bidirectional voltage or a...
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6735543 |
Method and apparatus for testing, characterizing and tuning a chip interface
An inter-chip line transmission circuit in a transmitting chip and complementary receiving circuit in a receiving chip provide the capability to characterize the inter-chip interface by separately...
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6597181 |
High and low side driver tests for airbag module
A method of testing a high-side driver and a low-side driver in an airbag squib circuit includes preliminary testing of squib resistance and squib leakage for a plurality of trials. Next, one of...
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6566893 |
Method and arrangement for monitoring surfaces for the presence of dew
A method and device for detecting condensation on surfaces of structural components. A evaluation signal is generated before dewing while the structural component is cooling. A detectable film is...
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6559660 |
Method and apparatus for testing an electrical system of a marine vessel
A monitoring circuit is provided to determine the proper operating condition of a cathodic protection circuit including a plurality of diodes and a capacitor. The monitoring circuit determines...
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6055848 |
Air quality measuring device
The present invention provides a device for measuring air quality. The device includes at least one sensor with a sensor resistance which is converted via signal processing into an output signal,...
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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...
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5600254 |
Process and circuit arrangement for measuring the resistance of a resistance sensor
In a process and a circuit arrangement for measuring the resistance of a resistance sensor, for instance a wetness sensor, via a rate of change of the charge of a capacitor, a measurement cycle...
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5394084 |
Method and apparatus for reducing errors in eddy-current conductivity measurements due to lift-off by interpolating between a plurality of reference conductivity measurements
An eddy-current apparatus for measuring the conductivity of a conductive material and for reducing the influence of lift-off on conductivity measurements is provided. The apparatus includes a probe...
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5121482 |
Circuit and method for automatic input-output configuration through local area network detection
The invented circuit includes an I/O driver capable of supplying current to an I/O connector, a current detection circuit that may include a current limit resistor and a differential amplifier, a...
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5063352 |
Circuit arrangement with a flow probe operated in a bridge circuit
In the case of a circuit arrangement with a flow probe operated in a bridge circuit, a device for determining bridge balance, which controls a triggering circuit which can be supplied by an...
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5027077 |
Humidity measuring apparatus
A humidity sensing apparatus which includes a humidity sensor which detects humidity as a function of impedance is provided. A reference resistor has a predetermined resistance value. A charge...
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4786875 |
Conductivity measuring circuit
A circuit for measuring the conductivity of a solution by applying a known ac current source across a pair of electrodes in the solution and utilizing an analog-to-digital dual slope converter,...
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4698584 |
Method and ohmmeter for measuring very low electric resistances
An ohmmeter for measuring very low electric resistances, for example the very low resistance of a very high current electric joint, which ohmmeter comprises a source for establishing a measuring...
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4644263 |
Method and apparatus for measuring water in crude oil
A method and apparatus for measuring the amount of fluids in a two-fluid mixture flowing in a conduit wherein the fluids have different electrical conductivities. The apparatus includes a...
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4594542 |
Solid state, high-low resistance monitor
A resistance monitoring solid state circuit distinguishes between a minimum high resistance condition and a maximum low resistance condition by current mode switching of a pair of transistors the...
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4578635 |
Device for measuring and indicating changes in the resistance of a living body
An apparatus for measuring and indicating changes in the resistance of a living body in which all changes in the resistance of the living body are displayed automatically by the apparatus. The...
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4523142 |
Apparatus for sensing dew and frost
An apparatus for sensing dew and frost, comprising a sensing portion which includes a substrate (1) having less permittivity than ice and includes a pair of electrodes (2, 3) arranged to touch the...
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RE31606 |
Digital ohmmeter with electrical continuity tester
In a digital test instrument such as a digital ohmmeter for measuring and digitally displaying the resistance of an unknown circuit element, there is included an electrical continuity tester...
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4451781 |
Moisture tester
A moisture tester for measuring the total moisture content of high moisture feed products such as corn, silage and cut hay including a probe or sensor having spaced apart electrodes in contact with...
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4408157 |
Resistance measuring arrangement
The invention employs a pair of known resistors which are permanently connected to the input terminals to which the unknown resistor may be connected. A source of d.c. voltage is connected to one...
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4362988 |
Method of and circuit arrangement for determining the magnitude of an unknown resistance element
In order to ascertain the magnitude R i of an unknown resistance element in digital terms, two calibrating resistances of known magnitudes R 1 and R 2 =mR 1 (with m>1) are connected in...
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4247816 |
Potentiometer with digital display
This invention relates to a potentiometer with a digital display indicating the position of the potentiometer slider. In a known potentiometer of this type, a mechanical multidigit counter is...
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4161691 |
Multi-purpose digital measuring apparatus
Apparatus for selectively measuring voltage, resistance, and time duration f an event, each of which is associated with an electrical network, includes a device for providing a first train of...
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4103227 |
Ion-controlled diode
Disclosed is an ion-controlled device for providing an electrical indication of a specific ion concentration in a fluid. An ion-sensitive membrane is placed over the junction of a gate controlled...
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4068165 |
Circuit for determining the slope of a signal
A circuit for determining the slope of a signal of a predetermined minimum duration and below an upper limit by carrying out an integration first in a positive and then in a negative direction in...
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4065715 |
Pulse duration modulated signal transducer
A transducer for producing a pulse duration modulated signal in accord with the value of a parameter. A reference capacitor-resistance circuit is provided having a predetermined rate of capacitor...
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4001676 |
Solid-state threshold detector
An apparatus for providing a warning when the magnitude of a monitored parameter, such as vehicle fuel level, is within a critical range. A charge pump repeatedly charges a variable capacitor...
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3984768 |
Apparatus for high voltage resistance measurement
Improved method and apparatus for measuring the effective operating resistance of an unknown resistance element to which repetitive high voltage pulses are normally applied during operation. As...
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3978402 |
Apparatus for producing an electrical output signal whose magnitude is linearly representative of the value of an unknown resistance
In a DVOM of the dual slope type, an unknown resistance or conductance to be measured is connected to a reference signal source to generate a voltage or current which is measured by the DVOM....
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3960010 |
Analog-digital converter for a resistance bridge
Apparatus which provides a digital signal which represents the unbalance in a resistance bridge. The apparatus includes a source of direct-current voltage which is applied alternately and...
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3956696 |
Apparatus for measuring the resistance of an inductor, having time constant compensation
Apparatus for measuring the DC resistance of large inductors. A series resistance is connected in series with the inductor and the combination is connected in parallel with a capacitor and a...
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3906342 |
Fault detector for igniter testing using high frequency noise
A method and apparatus for detecting faults in electrical resistance type igniters, particularly igniters of silicon carbide or the like, employs techniques wherein an operational voltage is...
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3906341 |
Fault detector for igniter testing using high frequency noise
A method and apparatus for detecting faults in electrical resistance type igniters, particularly igniters of silicon carbide or the like, employs techniques wherein an operational voltage is...
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3876933 |
Resistance measuring instrument with linearized digital readout
A device for measurement of electrical resistance in low or megohm ranges. In low scale operation the unknown resistance is subjected to a constant current source of known value and a digital...
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3875503 |
Dual slope type resistance deviation measuring apparatus
A resistance deviation measuring device, of the type used for measuring a temperature with temperature-sensitive resistance and for obtaining a digital signal representing the measured temperature,...
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3875501 |
Pulse width modulation type resistance deviation measuring apparatus
A resistance deviation measuring device, of the type used for measuring a temperature with a temperature-sensitive resistance and for obtaining a digital signal representing the measured...
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3849725 |
CIRCUIT FOR SWITCHING DIFFERENT RESISTANCE VALUES CORRESPONDING TO AMOUNT OF LIGHT MEASURED
A quantized indicating unit has a circuit path for current flow. A controllable constant current source is connected in the circuit path for current flow and has a control circuit. The current...
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3836847 |
CIRCUIT FOR MEASURING AN UNKNOWN RESISTANCE BY USING A VOLTAGE RATIO
A reference source is AC coupled to a converter for selectively providing both positive and negative reference signals to the converter. A reference signal potential is selectively applied to a...
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3816812 |
PORTABLE APPARATUS FOR MEASURING LOAD RESISTANCE
Portable apparatus for measuring the resistance of a load including a current pulse power supply generating a current pulse to be supplied to the load, a digital voltmeter for detecting the voltage...
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