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9018937 MEMS-based voltmeter  
An electromechanical system (MEMS) voltmeter. An exemplary MEMS voltmeter includes a proof mass mounted to a substrate in a teeter-totter manner. The MEMS voltmeter also includes an input voltage...
8981758 Measurement bridge in a printed circuit board  
A measurement bridge, in particular for a network analyzer, including a reference port, a central output port and a balun having a first balun input connector and a first and a second balun output...
8933688 Fast AC voltage detector  
A fast AC voltage detector includes a bridge rectifier connected to an AC power source, a threshold detector connected to an output of the bridge rectifier, a voltage isolation circuit connected...
8917079 Reference potential adjustment device and a measuring device equipped with the same  
A reference potential adjusting apparatus is provided. The reference potential adjusting apparatus includes a reference potential measuring unit configured to measure a potential of a solution, a...
8912785 Low-power RF peak detector  
Techniques are disclosed relating to radio frequency (RF) power detection. In one embodiment, a power detection circuit includes a multiplier circuit configured to multiply a first voltage signal...
8823358 Calibration apparatus and method thereof, multi-channel driving circuit and current balancing method  
A calibration method for adjusting an offset voltage of a unit is proposed. The unit, capable of operating in a calibration mode or a normal mode, includes a first input terminal, a second input...
8774365 Thermal compensation signal for high voltage sensing  
A high voltage sensing circuit with temperature compensation comprises a first series of resistors in parallel with a second series of resistors. The first series includes a material with a...
8760094 Power system protection  
An apparatus and method for protecting a power system comprising a generator providing power to an alternating current bus, a power converter for converting alternating current power on the...
8729884 Voltage measuring circuit  
A voltage measuring circuit includes a voltage measuring port, a voltage reference unit, a first voltage comparing unit and a light emitting diode. The voltage measuring port is for receiving an...
8730049 Water sensing electrode circuit  
A water sensing electrode circuit comprises a voltage source; first electrode; second electrode; first resistor; second resistor; and an inverting comparator with an internal reference voltage,...
8633840 Sequence transition point determining method and apparatus thereof  
A determining method and apparatus thereof for a transition point of a sequence which can be applied to a decoder. The determining method determines the transition point of the sequence having N...
8575950 Static/dynamic resistance measuring apparatus and method  
A resistance measuring apparatus which includes a variable voltage source, a signal display circuit, a bridge consisting of a first standard resistor, a second standard resistor, an adjustable...
8552710 Calibration apparatus and method thereof, multi-channel driving circuit and current balancing method  
A calibration method for adjusting an offset voltage of a unit is proposed. The unit, capable of operating in a calibration mode or a normal mode, includes a first input terminal, a second input...
8330447 Self-balancing frequency determining bridge  
A self-balancing Wheatstone bridge that provides frequency and power information. The frequency information obtained can be applied to correct the power measurement to provide excellent match,...
8129981 Apparatus for detecting a fault in the balancing unit  
An apparatus can be coupled to at least two lines for transmitting a differential signal, which is substantially symmetrical to a predefined reference potential, and/or for receiving such a...
7957844 Device and a method for power balancing  
A method for stabilization of the power balance in an electric power system including a number of nodes. An instantaneous value of the mains frequency of the electric power system is sensed. In...
7884596 Self-balancing frequency determining bridge  
A self-balancing Wheatstone bridge that provides frequency and power information. The frequency information obtained can be applied to correct the power measurement to provide excellent match,...
7769497 Method of super super decoupled loadflow computation for electrical power system  
A method of performing loadflow calculations for controlling voltages and power flow in a power network by reading on-line data of given/specified/scheduled/set network variables/parameters and...
7706991 Alternator tester  
An alternator tester is provided for testing an alternator of a vehicle while the alternator is coupled to the vehicle. A sensor is configured to couple to the vehicle and sense a signal related...
6747205 Device for assisting in the measurement of the earth resistance  
The invention relates to a device for assisting in the measurement of the earth resistance comprising a ground rod with a wire coiled up on a reel or the like, and electrical connecting means for...
6714881 Time reference compensation for improved metering accuracy  
A method for time reference compensation in a power metering system, the method comprising monitoring a time-dependent characteristic of incoming AC power over a predetermined local time interval,...
6657442 Micromechanical alternating and direct voltage reference apparatus  
An AC/DC voltage reference system has at least one micromechanically fabricated electrode pair having first and second electrodes facing each other so that the electrodes are disposed at a...
6582840 Fuel cell stack coolant conductivity sensor using differential voltage measurements  
A method and apparatus for detecting leakage current in the coolant of a fuel cell stack. The invention eliminates the use of a conductivity sensor by using a voltmeter to measure the voltage...
6118409 Method and device for inspecting at least one antenna branch, in particular in a vehicle  
In order to inspect at least one antenna branch (A1, A2, . . . An), in particular in a vehicle, a power level to be radiated is initially fed into the antenna branch, after which a power level...
5877619 Battery-operated hand field-strength meter and method of null balancing same  
A method of null balancing a hand field-strength meter is described in which the effect of the measurement probe on the balancing is suppressed by short-circuiting the measurement probe by two...
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....
5313165 Temperature-compensated apparatus for monitoring current having controlled sensitivity to supply voltage  
An apparatus for monitoring current through a lamp circuit that uses a series resistance shunt in the circuit with one end connected to a current source and the second end connected to the lamp....
5291073 Thermal power sensor  
A thermal power sensor for providing an output signal that is linearly related to the amount of power derived from a power source over a first range and that is square law related to the amount of...
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...
4795965 Capacitance to voltage conversion circuit including a capacitive bridge and a capacitive offset  
A capacitance to voltage conversion circuit for converting changes in capacitance of a capacitive bridge-type probe to voltage includes a detector for detecting changes in an excitation signal...
4786859 RMS measuring apparatus for AC/DC voltages  
A true RMS instrument using a multijunction thermal converter with two beaters automatically determines and displays the RMS value of an unknown voltage using two steps or modes. In an AC mode,...
4782285 Variable resolution control system  
A variable resolution system for a potentiometer converts the analog output of the potentiometer to digital steps which are multiplied to provide a number of digital output steps dependent upon...
4628257 Wattmeter  
A differential thermal wattmeter of the type disclosed in U.S. Pat. No. 4,045,734 is modified to remove undesirable in-phase a.c. ripple at the fundamental frequency in the feedback path. This...
4580062 Safety shield control device  
An electrical interlock to prevent unauthorized access to potentially hazardous equipment and an associated detection circuit to detect if a safety shield or closure member is open, not securely...
4420745 Security system  
A security system of the bridge circuit type has in one of its arms a conducting element whose impedance is to be monitored and in its other arms reference and/or compensating elements, for...
4375616 Non-loading digital voltmeter  
A substantially non-loading circuit for measuring voltages in a range with relatively high upper limit uses a resistive voltage divider for scaling down these voltages for application to a digital...
4263583 Digital alarm system with variable alarm hysteresis  
A digital alarm system for monitoring a variable process signal utilizing a variable, digitally controlled alarm hysteresis capability. The system includes a means for establishing a preselected...
4213088 Voltage measuring circuit  
A voltage indicating meter is connected between the outputs of two high impedance operational amplifiers, the first of which receives an input signal to be measured through a range setting...
4206404 Vacuum fluorescent indicator  
A vacuum fluorescent display has a filament heated below incandescence and phosphor coated anodes. A foraminous charge-control electrostatic lens between the filament and the viewer both controls...
4177423 Bridge circuits  
A bridge circuit for measuring or use in a temperature-responsive servo-mechanism. A chain of four or alternatively five resistors is connected between power supply rails, an inner two resistors...
4165653 Signal ratio indicator  
A pressure measuring system which includes a variable reluctance pressure transducer energized from an alternating voltage source, wherein the ratio of the output voltage to the source voltage is...
4156180 Apparatus and method for detecting metabolic activity  
An apparatus and method for detecting metabolic activity in a medium which includes an electrical circuit suitable for passing electrical current through a medium which contains a suspected...
4110685 Standing wave ratio measurement instrument  
The output voltages produced by two directional couplers are applied to analog circuitry for generating a voltage that is directly proportional to return loss. An analog meter scale is calibrated...
4091381 Digital indication for selectable impedance circuit  
A digital indication for a selectable impedance circuit consisting of a plurality of serially connected impedances and a selector which is connectable to a common junction of any of them is...
4071819 Device for sensing the real part in a complex impedance  
A device for accurately measuring the quantative value of the real part of complex impedance without the measurement affecting or being affected by the reactive component of that impedance. The...
4028642 Circuit for converting a temperature dependent input signal to a temperature independent output signal  
A bridge circuit for combination with a variable resistance sensor whose resistance may vary as a function of a sensed variable and also as a function of a parasitic variable such as, for example,...
3975669 Electronic damper motor control  
There is disclosed a motor control circuit that is particularly useful for the control of a damper motor in a heating and ventilating system. The control circuit comprises a bridge circuit having...
3970930 Current meter  
The invention relates to the supervision of a measuring circuit which is connected to a load by way of measuring leads. This load is connected to a generator via supply leads. The load is bridged...
3928799 Automatic balancing DC comparator voltmeter  
An apparatus for measuring potentials with great accuracy using a self-balancing current comparator. The comparator includes a variable primary winding and a secondary winding wound on a magnetic...
3923403 Circuit for light measuring devices and method  
Circuit and method of use thereof in light measuring devices and, particularly, devices for measuring optical density and the calibration of neutral density filters. The basic circuit includes a...
Matches 1 - 50 out of 235 1 2 3 4 5 >