1065 results about "Calibration test" patented technology

A test sensor is made that is adapted to assist in determining the concentration of an analyte in a fluid sample. The method includes providing a lid and providing a base. The lid is attached to the base to form an attached lid-base structure. The lid-base structure has a first end adapted to receive the fluid sample and a second opposing end adapted to be placed into a meter. Auto-calibration information is assigned to the lid-base structure. The second opposing end is formed such that the shape of the second opposing end corresponds to the auto-calibration information.

A self-calibrating test probe system of the present invention does not require probing head removal and replacement. Using the system of the present invention, the test probe and/or the entire system (including a testing instrument) may be calibrated or may self-calibrate while the probing head remains connected to an electrical component under test. The self-calibrating electrical testing probe system includes calibration circuitry including at least one input resistor, at least one relay, and at least one known calibration reference signal. If the test probe is an active test probe, the calibration circuitry may also include at least one amplifier. Each relay has a first position that provides signal access to a testing signal from an electrical component under test and a second position that provides signal access to the known calibration reference signal. Using the present invention, the error of the test probe and/or system is determined and compensated. Exemplary methods by which error compensation may be provided includes, for example, amplifying the testing signal, creating a correction table of correction values and adding an appropriate value from the correction table, or mathematically compensating.

An RF transceiver integrated circuit has a novel segmented, low parasitic capacitance, internal loopback conductor usable for conducting IP2 self testing and/or calibration. In a first novel aspect, the transmit mixer of the transceiver is a current mode output mixer. The receive mixer is a passive mixer that has a low input impedance. In the loopback mode, the transmit mixer drives a two tone current signal to the passive mixer via the loopback conductor. In a second novel aspect, only one quadrature branch of the transmit mixer is used to generate both tones required for carrying out an IP2 test. In a third novel aspect, a first calibration test is performed using one quadrature branch of the transmit mixer at the same time that a second calibration test is performed using the other quadrature branch, thereby reducing loopback test time and power consumption.

The invention relates to a mobile terminal parallel radio frequency testing device, which comprises a CDMA signal resource, a frequency spectrum analyzer and a switch matrix connected to the CDMA signal resource and the frequency spectrum analyzer; a testing control unit via the GPIB connecting the CDMA signal resource, the frequency spectrum analyzer, and the switch matrix; and a communication direct current power resource connected to the CDMA signal resource, the frequency spectrum analyzer and the tested mobile terminal to supply power for them. The invention uses the dynamic power testing technique based on the single point trigger and the mobile terminal sender, to realize the parallel correction test. The invention can correct and test the radio frequency property of the sender and the receiver of CDMA mobile terminal to improve the testing speed and improve the utilization of device.

An accurate calibration method of micro inertia measuring unit by decoupling erection error angle (EEA)with scale factor includes setting up MIMU integral error model and separating couple between EEA of accelerometer and gyroscope and scale factor ,using position error canceling method to calculate out and to separate out scale factor and EEA of accelerometer as well as using least square method and iteration method to calculate out EEA of gyroscope and its relative error items in 10 position static calibration test and in 3 direction positive and negative rate test ,then using interpolation method to calculate out scale factor of gyroscope .

A system and method to generate memory test patterns for the calibration of a delay locked loop (DLL) using pseudo random bit sequences (PRBS) generated through a pair of liner feedback shift registers (LFSR). The generated patterns are implemented on the system data bus as test patterns that closely simulate run-time switching conditions on the system bus, so as to allow more accurate calibration of the DLL. Test data write/read operations may be performed while signals for the test patterns are present on various bit lines in the data bus so as to allow for accurate determination or adjustment of the value for the delay to be provided by the DLL to the strobe signals during memory data reading operations at run time. Memory chips may also be tested over an operating range of values using the generated test patterns.

The invention provides a power calibration test system. The power calibration test system comprises a system setting device for setting target power and a target frequency band, a power meter connected with the system setting device and used for measuring output power in cooperation with a power sensor, a microwave vector network analyzer connected with the power meter and used for generating microwave signals, a frequency multiplier connected with the microwave vector network analyzer, a three-port directional coupler connected with the frequency multiplier, and a harmonic mixer connected with the microwave vector network analyzer and the three-port directional coupler. By means of a closed loop feedback loop, real-time closed loop monitoring and adjustment on input power of the reference plane of an input port of a component to be tested are achieved, real-time closed loop calibration on power within any frequency band and accurate measurement on circuits and devices can be achieved, and the universality, effectiveness, consistency and accuracy of the power calibration test system are largely improved.

A method for preparing calibration test sample of X ray stress measurement includes removing phenomenon of crystal particle coarsening and crystal face preferred orientation, carrying out short blasting treatment for semiproduct of the sample, stripping layer by layer for portion with greater stress gradient by electrochemical corrosion, carrying out X ray stress measurement and calibrating out work surface of the sample by utilizing relation curve of stress to layer depth.

The object of the Electrical Density Gauge (EDG) invention is to provide a low cost, portable, non-nuclear, and rugged field-use device that measures dry density in soils that have been constructed for use as road-beds and building foundations. This data is used to ensure the quality control of the constructed foundation. The electrical properties of soil are measured at a radio frequency using probes driven into the soil. To calibrate EDG, certain algorithms of these electrical properties are related to physically measured wet densities and unit weights of water for a plurality of calibration test spots. Correlation regressions are found, that are used to convert values of the electrical properties measured at unknown field test spots into values of dry density.

The invention discloses a control method of an SCR (Selective Catalytic Reduction) system of an electrical control diesel engine. The control method comprises the following steps of: obtaining injection quantity of urea under the steady-state working condition by taking two-dimensional grids of rotation speed and torque and two-dimensional grids of exhaust temperature and air speed as base points and corresponding to NOX (Nitric Oxide) emission and NOX conversion efficiency of the original engine; and, based on an SCR steady-state control policy, correcting the injection quantity of the urea in the steady-state working condition by utilizing a correction model composed of an ammonia quantity storage function and adsorption and desorption functions of NH3, and obtaining the SCR control policy in the instantaneous-state working condition. Based on the model, the control method is nearly applied to all diesel engines; subsequent works of manufactures are only that corresponding calibration tests are carried out aiming at different types, therefore, the cost can be reduced, the research and development period can be shortened, and the research and development efficiency of the SCR system and a complete diesel engine factory can be greatly increased. The invention further discloses an SCR system of the electrical control diesel engine adopting the control method.

A calibration compensation method of angle-measurement error of a rotating transformer based on a rate rotary table; the calibration method obtains the dynamic continuous output of the rotating transformer through a dynamic calibration test of a digital calibration system, so as to calibrate the cycle error term coefficient of the rotating transformer; calibrates the one degree term and zero degree term errors of the rotating transformer through a static calibration test; completes precise error calibration of the rotating transformer through the dynamic and the static tests; and later, builds a model to compensate the calibrated rotary error. The invention integrates the advantages of the dynamic and the static calibration methods, is not restricted by precision of an angle measuring device, is easy and simple; the built error compensation model of the rotating transformer greatly improves the angle-measuring precision of the rotating transformer. The method is also applicable in calibration and compensation of all other shaft angle sensors as well as the angle-measuring precision.

A network analysis system and methods facilitate a match-corrected signal power measurement using a vector network analyzer (VNA). The network analysis system includes the VNA and a computer program stored in memory and executed by a controller. The computer program has instructions that implement one or both of calibrating a test port of the VNA to determine the match-corrected signal power measurement and correcting a power measured for a signal received at the test port of the VNA using corrected error terms of a port calibration of the test port to yield a corrected measured power. The corrected error terms are determined from error terms of the port calibration using a switch term and an incident power calibration, both of the test port. A method 100 determines the match-corrected signal power measurement and a method 300 calibrates the VNA test port to determine the measurement.

The present invention discloses a test strip with optical identification patterns and a test instrument using the same characterized in that the test strip incorporates an identification area. Different combinations of optical identification patterns on the identification area create different digital identification signals. After the test strip is inserted into the test instrument, the test instrument will obtain the digital identification signal and learn the test code, analysis parameters, expiry date and batch number of the test strip. Thereby, the test instrument can verify the batch number and expiry date of the test strip, perform calibration according to the analysis parameters, and provide a correct test result. The present invention can provide many sets of digital identification signals to differentiate test strips. Therefore, the present invention can be operated fast, conveniently and correctly and can prevent a user from forgetting to calibrate the test instrument.

The invention relates to a control method of a clutch based on revolving speed and belongs to the field of clutch control. The control method provided by the invention is characterized that a clutch MAP figure control strategy is adopted in slipping stage of a clutch, the MAP figure lookup calculation is carried out according to the revolving speed difference of an output torque of the clutch and the input shaft of the clutch and the output shaft of the clutch, thereby controlling the position of the clutch; and driving intention of a driver is judged to output a clutch rotation speed target value curve according to the size and variable rate of an engine throttle; the D-value of the target value and actual value of the clutch revolving speed is calculated by virtue of PID (proportion integration differentiation), the position of the clutch is subjected to fine tuning, thereby meeting different driving intentions and travelling conditions. Compared with fuzzy control and a neural network, the control method provided by the invention has the advantages of small computational load, simple structure, and strong control instantaneity, and overcomes the delay problem of a controller singlechip caused by complicated control, and overcomes the influence from the variation in load of vehicles on the combined process; the dynamic property and economy of the automobile are unified by virtue of building MAP on a great deal calibration test, and the relation of the parameter characteristic and control objective in control process is clear and definite.

The invention discloses a multi-energy hybrid power comprehensive test device, belonging to the field of vehicle power performance test and relating to a comprehensive test device integrating a calibration system and an energy recovery system. A main part is formed by connecting an engine (1), a torque converter (2), a sensor (3), motors (4, 9), a sensor (5), a dynamometer (6), a brake (7), an inertia disc (8), a sensor (10), two rectification inverters (11 and 12), a battery-super capacitor (13), an engine ECU (Electronic Control Unit) (14), an integrated control system (18) and a calibration system (29) to a same shaft through a coupling (16). The test device can simulate the running conditions of most hybrid power vehicles, provide a test platform to develop the hybrid power vehicles, can also provide the test platform to harmoniously match a plurality of controllers, brake systems and control methods with the hybrid power vehicles and can finish about ten kinds of calibration tests relevant to the vehicle power performance test.

The invention relates to a standard calibrating device of a high-voltage three-phase combined mutual inductor, which belongs to an electronic calibrating device used for the electric energy measurement and the current measurement. The electronic calibrating device comprises a single chip, an A/D converter, a front end circuit and a 380v three-phase power supply; three current risers and the three-phase power supply adopt the star connection and are connected with a compensation winding Ns of a compensation adjusting coil in parallel, a secondary winding of the compensation adjusting coil is connected with a primary winding of a standard current mutual inductor; three voltage risers and the three-phase power supply adopt the delta connection and are connected with a compensation winding Y of the compensation adjusting coil in parallel, the secondary winding of the compensation adjusting coil is connected with a primary winding of a standard voltage mutual inductor, and the secondary windings of the standard circuit mutual inductor and the standard voltage mutual inductor are all used for connecting the tested three-phase combined mutual inductor. The invention can simulate the actual operation status of the mutual inductor, carry out the calibration test under the actual operation status and correctly reflect the actual error and the relevant performance of the three-phase mutual inductor.

The present invention discloses a test strip with identification openings and a test instrument using the same, which are characterized in that the test strip incorporates an identification area. Different combinations of the notched and unnotched positions, or the holed and unholed positions, on the identification area create different digital identification signals. After the test strip is inserted into the test instrument, the test instrument will obtain the digital identification signal and learn the test code, analysis parameters, expiry date and batch number of the test strip. Thereby, the test instrument can verify the batch number and expiry date of the test strip, perform calibration according to the analysis parameters, and provide a correct test result. The present invention can provide many sets of digital identification signals to differentiate test strips. Therefore, the present invention can be operated fast, conveniently and correctly and can prevent a user from forgetting to calibrate the test instrument.

The invention relates to a torque calibration test bed for a loader transmission shaft. The test bed mainly comprises a power module, a speed reducing module, a torque sensor, a switching module and an end part supporting module, wherein a motor in the power module is connected with a speed reducer in the speed reducing module through a shaft coupling; the speed reducer realizes gear transmission with a central shaft through a pinion and a large toothed sector; the central shaft is arranged on a bearing seat bracket through a bearing and a bearing seat; the torque sensor is coaxially fixed between the central shaft and a left deformed ring flange in the switching module through a flange; and a right deformed ring flange of the switching module is connected with a slipway of the end part supporting module in a sliding way through a slide block on a right deformed ring flange bracket. The limit of manual torque loading is overcome, the test bed is suitable for calibrating torques of loader transmission shafts of different specifications and different lengths, and quick calibration of the torques of different types of loader transmission shafts is realized.

The invention discloses a method for modeling a milling force in a peripheral milling process, which aims to solve the technical problem of the poor prediction precision of a milling force model established in the milling process in the conventional methods. In the method, the milling force model simultaneously comprising side-blade cutting and bottom-blade cutting is established so as to overcome the shortcoming that only the side-blade cutting is taken into account in the peripheral milling force modeling process in the conventional methods. Compared with the prior art, the method has the advantages of simplifying an equality relation A between a measured force and a predicted force as cutter eccentricity parameters are first determined, and allowing that the cutter is axially cut-in and divided into a plurality of sections in a calibration test to make a cutting-in depth equal to any value meeting conditions so as to make the calibration test more consistent with an actual machining state; and due to the adoption of a direct calibration method, all parameters in the model can be calibrated by one calibration test to save test cost.

The invention provides a near-field calibration method for relative amplitude and phase characteristics of spherical surface array antenna channels, and aims to provide a method with few calibration source and capable of automatically performing self-correction on the relative amplitude and phase characteristics. The near-field calibration method is characterized in that: calibration frames distributed around a spherical surface antenna array plane are set up on the periphery of a phased-array antenna and a calibration frame is set up at the center of the phased-array antenna, thus a conformalspherical surface array distribution model for antenna unit approximate uniform distribution is formed; optical equipment is used for performing high-precision measurement on a coordinate position ofeach calibration antenna relative to a central point of the spherical surface array antenna, and a spatial distance and an axial included angle between each array element on the spherical surface array antenna and each calibration antenna are calculated; and a calibration reference signal generated by calibration test equipment is used for calibrating uplink/downlink channels of the spherical surface array antenna, and amplitude/phase characteristics of element antenna channels are obtained through deducting relative amplitude and phase characteristics of the antenna and amplitude/phase changes introduced by the spatial distances and axial deflection between each calibration antenna and each array element.

The invention discloses a temperature field and deformation field synchronous measurement method and device based on DIC. The method is characterized by using a color CCD camera to cooperate with a filter to obtain surface speckle images of a measured sample at different temperatures in real time; using a calibration block made from the same batch of samples in advance to carry out a calibration test of a 5 DEG C temperature gradient; and converting data to a CIEL*a*b* color space with visual consistency and using a cubic spline interpolation to acquire a continuous temperature calibration curve. Real-time measurement of a temperature field is performed through combining the temperature calibration curve and by using a color change of a pixel point containing chameleon paint in the speckleimage, and a gray gradient image converted by the speckle image is used to carry out fast search of a sub-pixel deformation field so as to realize the synchronization acquisition of the temperature field and the deformation field. Operation is simple, and complexity and an asynchronous problem of an existing measurement method are overcome.

The present invention aims to efficiently calibrate the characteristics of a pair of reception or transmission low-pass filters by a receiving or transmitting circuit. A semiconductor integrated circuit includes an RF receiver that processes an RF reception signal, an RF transmitter that generates an RF transmission signal and a frequency synthesizer. A reception low-pass filter of the RF receiver suppresses undesired components contained in I and Q baseband reception signals. A transmission low-pass filter of the RF transmitter suppresses noise due to D/A conversion, which is contained in I and Q transmission analog baseband signals. A calibration test signal is supplied to the inputs of the pair of reception or transmission low-pass filters. A difference in phase between the pair of filters is detected by a phase detection unit. A calibration controller calibrates a relative mismatch between the cut-off frequencies of the pair of filters.

An actuator connected to receive high pressure gas from a pyrotechnic initiator incorporates a primary piston and a secondary piston mounted for limited movement along cylindrical bores in a housing; the pistons are held in a fixed inactive position and are restrained from movement within the housing by a tension screw connected to the primary piston and the housing. The tension screw incorporates a calibrated reduced diameter section that ruptures at a predetermined applied force to permit the pistons to move within the housing. Gaseous products resulting from initiation are trapped and maintained within the housing by an expandable bellows secured internally of the housing at one end of the bellows and secured at the opposite end of the bellows to the interior of the housing. A calibration/test port extends through the housing into the bore externally of the bellows to permit calibration and testing of the actuator without initiating the pyrotechnic device.

The invention relates to a wind driven generator coupler slipping torque calibration test bed and calibration method which is particularly suitable for stimulating actual working environment to conduct a slipping torque calibration test when a wind driven generator coupler is developed and leaves a factory. The test bed is mainly composed of a rack, a base plate, a torque loading mechanism, a torque output detecting mechanism, a hydraulic system and a computer control system. When the test is conducted, firstly the wind driven generator coupler is installed on the test bed, a hydraulic swing oil cylinder is started, the wind driven generator coupler is loaded by the torque loading mechanism, the load is acted on a tension and pressure sensor through the torque output detecting mechanism, transmission torque is obtained through indirect detection, and when a torque limiter of the wind driven generator coupler slips, the computer control system monitors that torque in a torque-angle curve suddenly changes, and the torque is the slipping torque of the wind driven generator coupler. The wind driven generator coupler slipping torque calibration test bed and calibration method is also suitable for slipping torque calibration of couplers and transmission shafts of other types.

The invention discloses a discrete variable structure observer-based lithium battery SOC (state of charge) estimation method. The method includes the following steps that: a rapid calibration test is performed on a lithium battery, a relation curve of SOC and open-circuit voltage (OCV) is obtained; a lithium battery discrete state space model for SOC estimation is established; a pulse discharge test is performed on the lithium battery, the parameters of the lithium battery model are identified; the terminal voltage and charge-discharge current of the lithium battery under a real-time collection condition are obtained; and a discrete variable structure observer is constructed to estimate the SOC of the lithium battery accurately. The method not only has a good SOC estimation effect, but also can ensure convergence strictly, and exhibits strong robustness to lithium battery modeling error, internal parameter perturbation and external disturbance.

The bacterial colony number sample for verifying food microbiological capacity relates to quality control technology in microbiological detection. The sample is matrix with added Bacillus cereus as leading bacteria and background bacteria. The matrix is practical food, and the background bacteria include one or several kinds of serratia marcescens, Citrobacter freundii, enteroaerogen and escherichia coli. The sample of the present invention has homogeneous colony number content, high finishing rate, and high stability, and may be used in test capacity verification of domestic and international labs. In the same time, the capacity verifying sample may be used in verification of detection method, calibration of test instrument, quality control and check of test result and other aspects.