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| Number | Title | Issue Date |
| 7746087 | Heating-control isolation-diode temperature-compensation A semiconductor integrated circuit (IC) acts as a controller of a heating-controlled device or appliance. A heating body has a positive temperature coefficient and acts as both a heating element and a temperature sensor. A Silicon-Controlled Rectifier (SCR) switches... | 06/29/2010 |
| 7639024 | Resistance compensation circuit and method thereof A resistance compensation circuit and a method thereof for tuning frequency, includes several resistors serially connected to one another, several transistors, each of which connects across one of the corresponding resistances, and a register electrically connected ... | 12/29/2009 |
| 7429866 | System and method for resistance measurement A method for improved cable resistance measuring is provided including coupling a measurement test device including a master unit and a remote unit, via at least one connector, to at least one network cable and determining a terminating impedance using field calibra... | 09/30/2008 |
| 7340951 | Distributed impedance sensor An apparatus is disclosed for measuring one or more parameters of a variable physical structure, at least one of the parameters being fluid level, position, velocity or acceleration. The apparatus includes an electromagnetic sensing element comprising at least two e... | 03/11/2008 |
| 7301352 | High sensitivity single or multi sensor interface circuit with constant voltage operation A sensor interface circuit is provided to interface many sensors simultaneously in a simple circuit arrangement consisting of two parts. Sensors in both parts operate under identical constant voltage. The circuit provides higher front end sensitivity than the Wheats... | 11/27/2007 |
| 7265560 | Temperature compensated vapor sensor A chemiresistor sensor system that compensates for changes in resistance caused by changes in ambient temperature, thereby increasing the accuracy of the sensor system's ability to detect target analytes. The sensor system generally includes a first resistor, a seco... | 09/04/2007 |
| 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 differential amplifier. The bridge circuit includes a first bridge arm for elect... | 02/20/2007 |
| 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 first and second output points connected to a differential amplifier... | 10/24/2006 |
| 7119547 | Testing apparatus A testing apparatus includes a first power supply unit and first and second coaxial cables. The first power supply supplies current to a device under test. The first coaxial cable includes a first internal conductor and a first external conductor. The second coaxial... | 10/10/2006 |
| 7088108 | Method for detecting an offset drift in a wheatstone measuring bridge In a method for detecting an offset drift in a resistive Wheatstone measuring bridge, a switch is made between a measuring mode and a testing mode without interfering in the internal structure of the measuring bridge. In testing mode, two sensor resistors that act i... | 08/08/2006 |
| 7015702 | Method for evaluating a measuring signal and corresponding circuit arrangement In order to measure the current in a shunt, the voltage drop in the resistor of said shunt is evaluated as a measurement of the current. Normally, galvanic separation of the measuring device is required for high-potential shunts. A digital measuring signal provides ... | 03/21/2006 |
| 6930496 | Range resistors for AC-DC transfer measurements A range resistor, for deployment with a low voltage AC measuring instrument as a voltage range multiplying attenuator, provides increased accuracy in the measurement of high AC voltages at frequencies up to 1 MHz, particularly when large attenuation ratios are neede... | 08/16/2005 |
| 6842020 | Method for measuring a gap between a proximity probe and a conductive target material A digital eddy current proximity system including a digital impedance measuring device for digitally measuring the proximity probes impedance correlative to displacement motion and position of a metallic target object being monitored. The system further including a ... | 01/11/2005 |
| 6512383 | System for measuring the alternating current equivalent series resistance of a conductor A system and method for measuring the alternating current series resistance of a conductor when transporting large currents on the order of several thousand amperes. The system comprises a current sensor, a current/voltage converter, a voltage divider, a ... | 01/28/2003 |
| 6388451 | Leakage current cancellation device A system (20, 30, 40, 50) and method for canceling a leakage current is provided that uses line voltages (L1, L2) that are out of phase with each other to produce a counter leakage potential that cancels leakage current. In one embodiment of the invention... | 05/14/2002 |
| 6265880 | Apparatus and method for detecting conduit chafing Apparatus and method to identify chafing of a conduit, thereby reducing the failure of any system which would be damaged or whose function would be impaired by abrasion of the conduit. Such a system may carry electrical power, fuel, other fluid, hydraulic... | 07/24/2001 |
| 6098464 | Wheatstone bridge with temperature gradient compensation The output voltage of a Wheatstone bridge type electrical circuit compris four main resistances (J1 to J4) having substantially the same ohmic value, R, and substantially the same temperature coefficient of resistance, , is m... | 08/08/2000 |
| 5959463 | Semiconductor test apparatus for measuring power supply current of semiconductor device A power supply voltage (Vcc) is applied to a dummy capacitor having a capacitance identical to that of a bypass capacitor to generate an excessive current. The excessive current is subtracted from a current flowing through an IC and the bypass capacitor t... | 09/28/1999 |
| 5896033 | Method and device for electronic compensation of electrical disturbance signals and use thereof The invention consists of a system to compensate for the parasitic signal induced by a parasitic impedance in the signal path. An auxiliary signal, outside of the frequency band of the desired signal, is introduced to evaluate the effects of the parasitic... | 04/20/1999 |
| 5808461 | Circuit arrangement for air quality measurement with logarithmic signal evaluation A circuit arrangement for air quality measuring having at least one sensor element which has resistors the resistance of which changes depending on the air composition. The circuit arrangement has an evaluation circuit for the sensor signals and includes ... | 09/15/1998 |
| 5757197 | Method and apparatus for electrically determining the presence, absence or level of a conducting medium, contamination notwithstanding Sensing apparatus is disclosed which allows for the determination of the presence, absence or percentage of a conducting medium such as water, by electronic means. The inventive apparatus negates the effect of a false signal generated by contamination of ... | 05/26/1998 |
| 5751152 | Method and apparatus for concurrently measuring near end crosstalk at two ends of a cable The apparatus includes a first transmitter for transmitting a first test signal from a first end of the cable and a second transmitter for transmitting a second test signal from a second end of the cable. The first test signal is transmitted on a first co... | 05/12/1998 |
| 5583442 | Differential voltage monitor using a bridge circuit with resistors on and off of an integrated circuit A differential voltage monitor is shown using a resistive bridge to produce a sample value representing that differential voltage. A portion of the resistive bridge is located on an IC and a portion is external to the IC. The object is to compare the diff... | 12/10/1996 |
| 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 Rin and a feedback loop with a resistance Rfb. The critical wires being tested must be a signal wir... | 09/03/1996 |
| 5532590 | Apparatus for measuring circuit parameters wherein errors due to transmission lines are prevented A measuring circuit obtains desired characteristic values of a device under test by accurately measuring a voltage and a current. Errors are eliminated that originate from the transmission characteristics of cables used in measurements at high frequencies... | 07/02/1996 |
| 5502391 | Apparatus for measuring the crosstalk in a cable Apparatus to measure the crosstalk between pairs of conductors in a cable. The measurements are affected by the crosstalk inherent to the connectors that are part of the apparatus. The improvement consists of adding a compensating signal which equals that... | 03/26/1996 |
| 5481201 | Circuit for generating a current linearly proportional to displacement of a movable member A circuit for generating a linear current proportional to the displacement of the movable member of a transducer receives an undetermined supply voltage from a monitoring circuit which has a relatively high internal resistance. The circuit is provided wit... | 01/02/1996 |
| 5448173 | Triple-probe plasma measuring apparatus for correcting space potential errors With a view to enabling errors in the space potential to be automatically corrected by detecting a floating potential in each of a plurality of probes and to remove the errors in measurement based on the corrected space potential to thereby realize the ac... | 09/05/1995 |
| 5381102 | Device with a current divider for controlling adjustment of signals from sensors A device for adjusting sensor signals, and, in particular, signals supplied to a sensor for detecting an operating parameter of a motor vehicle having an internal combustion engine. The device has adjustment elements and a current divider, which includes ... | 01/10/1995 |
| 5374892 | Digital electrochemical instrument with background compensation An instrument and method for measuring chemical properties, the instrument having electrodes suitable for immersion in a chemical solution. A voltage source and a current-sensing circuit are connected to the electrodes to measure the current produced in t... | 12/20/1994 |
| 5345184 | Humidity detection circuit for electronic heat cooking apparatus A humidity detection circuit includes a bridge circuit containing temperature sensing elements. The bridge circuit is connected in series to a current limiting resistance, a current controlling element and a power supply. There is a set of resistances arr... | 09/06/1994 |
| 5279145 | Heater control device for an air-fuel ratio sensor A heater control device for an air-fuel ratio sensor which comprises: an air-fuel ratio sensor comprising a sensor element which detects an air-fuel ratio state of exhaust gas of an engine, and a heater which heats the sensor elements; a heater current fl... | 01/18/1994 |
| 5216373 | Circuit element measuring apparatus and method for measuring a parameter of a DUT including a compensation network having an admittance characteristic A circuit element measuring apparatus for measuring a parameter of a device under test (DUT) includes a signal source, a voltmeter, a zero detection amplifier, and a compensation network all of which are coupled to the DUT by four shielded lines. The comp... | 06/01/1993 |
| 5210501 | Apparatus for processing sensor signals having switch-capacitor structures The arrangement serves to process sensor signals furnished by a sensor which when fed with a supply signal in response to the action of a physical measured quantity. The sensor generates a measuring effect representing the dependence of an electrical char... | 05/11/1993 |
| 5182519 | Heater control device for an air-fuel ratio sensor A heater control device for an air-fuel ratio sensor which comprises: an air-fuel ratio sensor comprising a sensor element which detects an air-fuel ratio state of exhaust gas of an engine, and a heater which heats the sensor elements; a heater current fl... | 01/26/1993 |
| 5159277 | Precision bridge circuit using a temperature sensor A precision bridge measurement circuit connected to a current source providing a linear output voltage versus resistance change of a variable resistance (resistance temperature transducer) including a voltage follower in one branch of the bridge so that t... | 10/27/1992 |
| 5138264 | Apparatus for measuring electrical conductivity An electrical conductivity measuring apparatus for measuring the electrical conductivity of liquid has a plurality of electrodes disposed in the liquid contained in a measuring cell, with an a.c. voltage being applied between the electrodes, thereby measu... | 08/11/1992 |
| 5122756 | Linearization of a sensing bridge circuit output The output of a condition sensing bridge is linearized by providing a feedback from the output to the bridge supply which feedback is in the linear form of VB =KVO +VX where VB is the bridge supply voltage, K is... | 06/16/1992 |
| 5061447 | Catalytic combustion type CO gas sensor A catalytic combustion type CO gas sensor which is composed of an electrical circuit by serially arranging two coils composing an active section and a compensating section, and by providing serial bridge resistances, r1 and r2, oppos... | 10/29/1991 |
| 5030919 | Zero impedance switch In a switchable impedance tester for measuring very small impedances, the effect of switch impedances is eliminated by connecting the test load between two switching transistors in their emitter-collector circuit, and driving them with operational amplifi... | 07/09/1991 |
