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8138697 Sensorless speed detection during zero vector  
A speed estimation method for determining the speed of a sensorless permanent magnet brushless motor having one or more phases driven by one or more stages of an inverter, each stage including...
8063648 Method and device for demodulation of signals  
A method and device are provided for demodulation of an output signal from a transducer (1) driven by an alternating excitation signal having an excitation frequency. The transducer produces an...
8044670 Apparatus and method for determining a resonant frequency of a wind turbine tower  
An apparatus for determining a resonant frequency of a wind turbine tower is provided. The apparatus includes a processing unit configured to receive an acceleration measurement value, the...
8022687 Secum-trahenz method, especially for a network analyzer, for measurement of a device  
The invention relates to a method for measuring objects for measurement, by means of a network analyzer with several measurement ports, at least one signal generator, for stimulating the object for...
7924024 Automatic calibration techniques with improved accuracy and lower complexity for high frequency vector network analyzers  
A calibration module, for use in calibrating a VNA, includes ports connectable to the VNA, calibration standards, and single pole multi throw (SPMT) switches. Each SPMT includes a single pole...
7816927 Method and system for real time identification of voltage stability via identification of weakest lines and buses contributing to power system collapse  
A method of identifying voltage instability in a power system via identification of a weakest line and bus that contribute to the collapse of the system is provided. The method includes...
7768271 Method for calibration of a vectorial network analyzer having more than two ports  
Method for calibrating a vectorial network analyzer, with n measurement ports (n>2) and at least m measurement sites, where m>n+1 includes measurement of three different n-port reflection...
7714592 System and method for determining the impedance of a medium voltage power line  
A system and method of detecting changes in the impedance of a segment of medium voltage power line is provided. In one embodiment, the method comprises receiving voltage data comprising data of...
7683633 Apparatus for extending the bandwidth of vector network analyzer receivers  
A system for measuring a frequency response of an electrical network includes a signal source, a signal source path, a reflectometer receiver interactively associated with the signal source path by...
7646205 S-parameter measurement  
The invention provides for a method of using a network analyzer and a test controller for measuring S-parameters of a device, which can assume a plurality of states, and which can switch very fast...
7629795 Vector impedance measurement system and method of using same  
A vector impedance measurement system (100) includes a first radio frequency (RF) source (101) for providing energy to a test circuit. A measurement device (111) is used for providing a first...
7592818 Method and apparatus for measuring scattering coefficient of device under test  
A measuring method and measurement system that includes a signal source that applies a signal to a device under test, a scalar measuring instrument that measures a reflected wave reflected from the...
7545151 Characterizing test fixtures  
Provided herein are techniques for characterizing a test fixture that is used for connecting a device under test (DUT) to a vector network analyzer (VNA), e.g., to thereby enable de-embedding of...
7532991 Magnetic data processing device  
In a magnetic data processing device, an input part sequentially inputs magnetic data outputted from a two-dimensional or three-dimensional magnetic sensor. The magnetic data is two-dimensional or...
7518353 Vector network analysis system and method using offset stimulus signals  
A vector network analysis system and a method of measuring use offset stimulus signals to stimulate a balanced device under test (DUT) to determine performance parameters. The system includes an...
7469547 Arrangement for detecting the position of a damper blade using a wireless communication sensor  
A damper assembly includes a damper frame, at least one damper blade, an actuator and a sensor module. The damper blade(s) is/are movably attached to the damper frame to at least partially regulate...
7348784 Error factor acquisition device, method, program, and recording medium  
A measurement system for circuit parameters of a device under test (DUT) that reduces the number of attachments and detachments of calibration kits. An error factor acquisition device includes a...
7298158 Network analyzing apparatus and test method  
A network analyzing apparatus that analyzes the network properties of a device under test by applying reference signals to a device under test by frequency sweeping or power sweeping comprises...
7157918 Method and system for calibrating a measurement device path and for measuring a device under test in the calibrated measurement device path  
A method and system of calibrating first and second adapters comprises the steps of calibrating coaxial ports of a vector network analyzer to traceable standards and connecting a symmetrical...
7148702 VNA and method for addressing transmission line effects in VNA measurement data  
In one embodiment, a vector network analyzer (VNA) comprises a plurality of ports for coupling to a device under test (DUT), at least one reference receiver for measuring signals associated with...
7107162 Determining an operational limit of a power transmission line  
In a method, computer program and system for determining an operational limit of a power transmission line, time-stamped current phasor information and voltage phasor information for a first end...
7088110 System and method for determining S-parameters of a connected structure  
One disclosed embodiment may include a method that includes providing a first set S-parameters for a path of a first substrate having a first port and a second port and providing a second set of...
7088111 Enhanced isolation level between sampling channels in a vector network analyzer  
A system and method for providing improved isolation between sampling channels in a vector network analyzer and sampling circuit. A vector network analyzer sampling channel includes a non-linear...
7061221 Reduced complexity transmission line and waveguide fault tester  
A four-port junction is substituted for a six-port junction in a frequency domain reflectometer, which reduces the parts count and therefore cost and size of the reflectometer while improving...
7034548 Balanced device characterization including test system calibration  
A test system and method characterize a balanced device under test (DUT) with a vector network analyzer (VNA) measurement system using a differential or balanced stimulus signal and further...
7030627 Wideband complex radio frequency impedance measurement  
Impedance of an unknown load is determined by applying a reference signal from a signal generator through a multi-position switch to the unknown load, a first known calibration impedance, and...
7005918 Current-to-voltage converting apparatus and impedance measuring apparatus  
A current-to-voltage converting apparatus connected to an element or a circuit having a first terminal connected to a signal source and comprising a feedback amplifier, which is connected to a...
6970002 Tube measurement and calibration system  
A tube measurement and calibration system including a network analyzer for measuring tube radio frequency phase, a calibration adapter for calibrating tube radio frequency power and phase, an...
6956380 Narrow-band amplifier and impedance-measuring apparatus  
An impedance measuring apparatus comprising an automatic balanced bridge has four numerically controlled oscillators that supply sine-wave signals and cosine-wave signals to the quadrature detector...
6816825 Simulation vector generation from HDL descriptions for observability-enhanced statement coverage  
A method of automatically generating vector sequences for an observability based coverage metric supports design validation. A design validation method for Register Transfer Level (RTL) circuits...
6760633 Method and apparatus for predicting stability of a closed loop apparatus  
A method for predicting stability of a closed loop apparatus is disclosed. The closed loop apparatus has an open loop impedance and at least one inherent internal gain. The method comprises the...
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...
6483501 Load current compensated type voltage sampling circuit  
A load current compensated voltage sampling circuit is characterized by a sampling voltage that is compensated by utilizing different load current values of the detected sample as parameters for...
6396287 Process for measuring output harmonic relative to output fundamental with enhanced accuracy  
A method is provided for eliminating the source harmonic component from VNA measurements of the output of a device under test (DUT). A standard vector measurement, GHx, is first measured from the...
6392422 Monitoring insulation and fault current in an A/C current network to provide load shutoff whenever differential current exceeds a certain response value  
A method and device for monitoring insulation and fault current in an electrical alternating current network. The differential current formed by vectorial addition is detected between at least two...
6385547 Automatic monitoring of high voltage signals  
A pair of terminals across a voltage to be monitored includes, in series, a resistor for developing a low voltage proportional to the high voltage to be monitored, a resistor to develop a voltage...
6348804 Vector network analyzer  
In a vectorial network analyzer having at least two measuring ports, whose measuring arms respectively have quad gates with the accompanying measuring points, a separate high-frequency generator is...
6329808 Method and system for the detection, by inductive coupling, of a load modulation signal  
A system for the detection of a load modulation signal by inductive coupling includes an antenna circuit having a coil, a circuit for applying an excitation signal having a predetermined frequency...
6316945 Process for harmonic measurement accuracy enhancement  
A method for determining the harmonic response of a device under test (DUT) to the input fundamental frequency component of an input signal is performed on a vector network analyzer. A first...
6259259 Method and apparatus for automatically adjusting the measurement range of admittance level sensors  
A method for rectifying a sensor current with a synchronous demodulator, wherein the rectifying factor of the synchronous demodulator can be controlled. A control clock pulse signal of the...
6054867 Method for stabilizing feedback loop of impedance measuring apparatus  
A method for stabilizing feedback loop in impedance measuring equipment involves determining a null loop transfer function of the impedance measuring device by utilizing multiple independent, known...
6023170 Method for determining the degree of hardening of a material  
6005398 High speed phase and amplitude measurement system and method  
An impedance measurement system rapidly determines impedance of a sinusoidal signal at a known frequency. The sinusoidal signal can represent a forward voltage, a reflected voltage, a voltage, or a...
5977779 Handheld vecor network analyzer (VNA) operating at a high frequency by mixing LO and RF signals having offset odd harmonics  
A vector network analyzer (VNA) has a first harmonic generator multiplying an RF signal by an odd number M1 to produce incident and reflected test signals received at inputs of mixers providing IF...
5717336 Method and apparatus for determining the charge condition of an electrochemical cell  
A method for determining whether an electrochemical cell is substantially fully charged. The determination is made by ascertaining the rate of change of the impedance of the cell with changing...
5715183 Internal automatic calibrator for vector network analyzers  
A calibration technique for a vector network analyzer (VNA) enabling calibration standards to be included internal to the VNA. To calibrate the VNA utilizing the internal calibration standards,...
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...
5621332 Device and method for identifying and quantifying layered substances  
An apparatus for identifying and measuring in real time substances overlying a surface comprises a plurality of electrodes, a temperature sensor, an electrode control system connected to the...
5612601 Method for assessing motor insulation on operating motors  
A method for monitoring the condition of electrical-motor-driven devices. The method is achieved by monitoring electrical variables associated with the functioning of an operating motor, applying...
5559439 Method and device for measuring the compensation tuning and detuning of an electrical distribution network  
A method and a device for measuring compensation balance and imbalance in an electrical supply network having a balancing coil. An auxiliary measurement signal is injected into the network's...
Matches 1 - 50 out of 169 1 2 3 4 >