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7307430 Open offset canceling method and an impedance measuring apparatus using the method  
A method for finding the impedance of a device under test using an impedance measuring apparatus having a modem-type auto-balancing bridge, two or more measurement signals, each of which has a...
7304484 Method and device for the temperature compensation of a measuring bridge  
A method for the temperature compensation of a resistance measuring bridge, such as in particular a Wheatstone bridge, is characterized in that a capacitor positioned between the input circuit and...
7231309 Method and apparatus for testing a bridge circuit  
A method and an apparatus for testing a bridge circuit. The method includes inputting a first test clock to a first conversion unit for triggering the first conversion unit to transfer a test data...
7205781 Mass air flow circuit having pulse width modulation feedback control  
A circuit for measuring the mass air flow rate through a duct is disclosed. The circuit includes a bridge circuit, a first amplifier, an oscillator, a comparator and a switch. The bridge circuit...
7190178 Pade′ Approximant based compensation for integrated sensor modules and the like  
Methods and systems using Pade' Approximant expansion ratios provide mappings between nonlinear sensors and a more linearized output domain. In one embodiment (a) a variable gain amplifier receives...
7180311 Physical quantity sensing device with bridge circuit and zero point adjusting method  
A physical quantity sensing device includes a bridge circuit that has first and second input points, to which an AC voltage is applied, and first and second output points connected to a...
7141991 Instrumentation current loop  
An instrumentation current loop, including a transducer having transducer output terminals. A power source is connected in series to the transducer. A bridge has a first arm and a second arm...
7126355 Physical quantity sensing device with bridge circuit and temperature compensating method  
A physical quantity sensing device includes an AC voltage generator for generating an AC voltage and a bridge circuit that has first and second input points, to which the AC voltage is applied, and...
7075448 Method and circuit arrangement for offset correction of a measurement bridge  
In the method and circuit arrangement for offset correction of the measurement bridge, the full bridge signal and half bridge signal of the measuring bridge are measured; a self-adjustment of the...
7030600 Broadband microwave power sensor  
A circuit for sensing radio frequency energy. The circuit includes a Wheatstone bridge having at least one element thereof thermally responsive to the radio frequency energy passing therethough...
7015706 Semiconductor sensing device using different resistance types  
A semiconductor sensing device has a semiconductor substrate with a pressure sensing bridge circuit including piezo-resistance elements formed on the substrate. Further, the semiconductor sensing...
6984995 Device to audibly express impendance measurement  
An Audio Feedback Impedance Comparison Device to audibly express Impedance differences between/amongst components, circuits, materials, substances etc., to make use of the aural sense, while...
6803776 Current-comparator-based four-terminal resistance bridge for power frequencies  
A current comparator technique is applied to four-terminal resistance measurements for obtaining a highly accurate AC resistance bridge at power frequencies of 50 Hz to 60 Hz. Active circuits are...
6765391 Low cost asic architecture for safety critical applications monitoring an applied stimulus  
An ASIC ( 14, 14′, 14″ ) conditions two independent outputs (VINM, VINP) of a full Wheatstone piezoresistive bridge ( 12 ) in separate conditioning paths. Each path is provided with a bridge...
6750665 Semiconductor pressure detecting device  
The voltage corresponding to the pressure outputted from a Wheatstone bridge having resistors R 1 to R 4 is amplified by a differential amplifier 3 and operational amplifiers OP 1 , OP 2 , and...
6727709 Vacuum gauge using peltier tip  
A thermal conduction vacuum gauge using a Peltier tip is provided. The vacuum gauge for measuring the pressure in a vacuum chamber includes: a signal generator that drives an electric current; an...
6724202 Physical quantity detection device with temperature compensation  
First and second resistors (sensing elements) are connected in series between first and second potentials. The junction point voltage between the first and second resistor is supplied to an...
6696846 Self-balanced active current bridge for measuring the impedance of an external device  
A self-balanced active current bridge for measuring the impedance of an external device or an output current, including an input potential source and operation amplifier connected to the input...
6646446 Method and apparatus for fault detection in a resistive bridge sensor  
A full Wheatstone bridge sensor has conditioning electronics of an ASIC connected thereto. Two independently controlled diagnostic switches (S1, S2) in the ASIC are commonly connected to one of the...
6593757 Capacitance type displacement detection apparatus  
A transmission electrode 10 and a detection electrode 12 are placed in an electrode section of a sensor and are capacity-coupled with a reception electrode placed on an opposed scale. Capacity...
6593760 Apparatus for measuring thermal properties and making thermomechanical modification on sample surface with peltier tip  
An apparatus for measuring thermal properties and making thermomechanical modifications on a material surface using a junction of different metallic wires. The junction of different metallic wires,...
6559661 Circuit configuration for compensating the temperature non-linearity of the characteristic curves of the piezoresistive measuring resistors connected in a bridge circuit  
A circuit arrangement is described for compensating temperature non-linearity of the characteristics of piezoresistive, metallic or polycrystalline resistors (bridge resistors) connected in a...
6489787 Gas detection circuit  
A circuit capable of detecting natural gas at a wide range of concentrations is disclosed. The gas detection circuit includes a catalytic Wheatstone bridge circuit and an analyzing Wheatstone...
6329825 Sensing apparatus having a sensing bridge circuit and a temperature detecting bridge circuit for detecting a physical quantity and a related temperature compensating method  
A pressure detecting bridge circuit produces a sensor signal Sd. A temperature detecting bridge circuit produces a temperature signal St. A reference voltage generating circuit produces a reference...
6323662 Device for the precise measurement of magnitudes and method of verification of correct functioning of the device  
The improved device for precise measurement of magnitudes includes a closed network circuit, an instrument for detecting malfunctions in the closed network circuit and means for outputting an...
6204673 Method and apparatus using feedback to correct the production of magnitude and phase relationships between two sinusoidal signals for use in a ratio-transformer capacitance bridge  
A capacitance measuring device and method including ratio transformers, a reference capacitor(s), multiplying digital-to-analog converters connected to form a bridge, the converters being...
6198296 Bridge sensor linearization circuit and method  
A linearization circuit includes a sensor circuit having a first terminal receiving an excitation voltage, and second and third terminals producing a sensor output voltage therebetween. A...
6190039 Heated type sensor with auxiliary heater in bridge circuit for maintaining constant sensor temperature  
A main heater, auxiliary heater and guard heater arranged on an insulator substrate to absorb leakage current, thereby maintaining precise sensing temperature. The main heater is parallel with a...
6049212 Connector saving adapters and SWR bridge configuration allowing multiple connector types to be used with a single SWR bridge  
An SWR bridge with an accompanying set of connector saving adapters for connecting between the test port of the SWR bridge and a test device. The SWR bridge includes a branch opposite the test port...
5948978 Induction heated mass flow sensor  
Sensors for measuring the flow rate of a fluid and for monitoring heat transfer. An induction-heated temperature-responsive sensor in contact with and cooled by the fluid, changes temperature in...
5898302 Residual stress measurements in metal objects using four coils  
A device for measuring residual stress in ferromagnetic and non-ferromagnetic metal objects. The device having four electrically identical induction coils which form a four terminal alternating...
5764067 Method and apparatus for sensor signal conditioning using low-cost, high-accuracy analog circuitry  
The present invention, generally speaking, provides for highly accurate correction of a sensor output using circuitry that is compact and inexpensive. In accordance with one embodiment of the...
5723773 Bubble detector  
The presence of bubbles on such photographic material, as is well known, results in significant defects in the photographic materials produced so that it is important, in the manufacture of such...
5724387 Cable loss simulator for serial digital source using a passive network  
A cable loss simulator for a serial digital signal source adapts a constant resistance, bridged-T passive network to simulate the frequency-loss characteristics of a reference coaxial cable. The...
5703490 Circuit and method for measuring current in an H-bridge drive network  
A circuit measures the driving and circulating current in an H-bridge drive network directly and linearly. Voltage across two current sensing resistors are input to two precision half-wave...
5634828 Capacitive pickup clip  
A clip is used for receiving one of a plurality of wires of various sizes. The clip includes a non-movable portion including a wire receiving surface and a movable portion disposed at least...
5552712 Method for in-place circuit integrity testing  
A system for testing the integrity of critical circuitry, lines and wires employs a differential amplifier having an input resistance R in and a feedback loop with a resistance R fb . The critical...
5519329 Sensor for circuit tracer  
A circuit tracer for determinating the location of a conductor, such as a wire, which is either an open or closed circuit, and which may lie underground. The tracer includes a transmitter which is...
5506509 Circuit and method of measuring squib resistance  
A resistance measuring circuit (10) generates a predetermined reference voltage and impresses that reference voltage across a squib detonation device (12). The resulting current flowing through the...
5488310 Return-loss detection for serial digital source  
A return-loss detector for a serial digital signal source uses a return-loss bridge circuit to exploit the broadband spectral characteristics of a serial digital signal from the signal source to...
5485100 Automatically balanced and tested bridge measurement circuit, and method  
The output of a bridge measurement circuit is sampled at a time when there is no desired, or expected, bridge output signal, and a balance voltage applied to the bridge measurement circuit is...
5461322 Autonulling DC bridge for real-time sensor transduction and voltage measurements  
A feedback operated DC bridge circuit for monitoring the voltage variations in a voltage divider circuit using a voltage controlled resistance component to reach a null balance across the bridge....
5457393 Method and circuit for balancing an error signal  
A circuit for balancing an error signal delivered by an apparatus. When the apparatus is switched on initially, the error signal may be large and thereafter change only slowly with time. The error...
5412327 Distance sensor utilizing a bridge circuit incorporating variable capacitances  
A capactive sensor contains a bridge circuit (1,2,3,4) which is comprised of an electrode surface (21) and a reference electrode surface (24) with the electrode surfaces located on the opposite...
5398194 Electronic sensing circuit using piezoresistors  
An electronic sensing circuit, which can be used in place of a linear variable differential transformer (LVDT) has four piezoresistor elements in a Wheatstone bridge configuration. A source voltage...
5350237 Temperature measuring circuit for heating and cooking appliances  
In a temperature measuring circuit connecting a temperature sensor such as a thermistor to a standard voltage source through tap resistances, detecting a sensed value of the temperature sensor by...
5287065 Automatic bridge balancing using controllable impedance in characterizing unknown impedance  
Automatic bridge balancing apparatus includes a reference impedance and a measuring terminal pair for receiving an unknown impedance. A source of a test signal is coupled to the reference impedance...
5264798 Autonulling AC bridge using differential and integration feedback  
A self-contained autonulling bridge circuit based on phase-sensitive deteon of an impedance to be measured is described. The system utilizes a feedback structure to control a variable impedance in...
5225784 DC Current comparator circuit for generating an adjustable output proportional to an input signal  
A DC current-comparator-based circuit generates an adjustable output proportional to an input signal, i.e. an input voltage or current. One use of the circuit is in the formation of a DC resistance...
5197334 Programmable compensation of bridge circuit thermal response  
The present invention provides compensation for temperature in a transducer by connecting the adjustment resistors to the transducer itself to provide a correct transducer output. A number of...
Matches 1 - 50 out of 169 1 2 3 4 >