2385 results about "Tested time" patented technology

A novel and useful apparatus for and method of predistortion calibration and built-in self testing (BIST) of a nonlinear digitally-controlled radio frequency (RF) power amplifier (DPA) using subharmonic mixing. The RF power amplifier output is temporarily coupled into the frequency reference (FREF) input and the phase error samples generated in the phase locked loop (PLL) are then observed and analyzed. The digital predistortion and BIST mechanisms process the phase error samples to calibrate and test the DPA in the transmitter of the Digital RF Processor (DRP). The invention enables the characterization of nonlinearities, the configuration of internal predistortion, as well as the testing of the transmitter's analog/RF circuitry, thereby eliminating commonly employed RF performance testing using high-cost test equipment and associated extended test times.

An in-band OTDR uses a network's communication protocols to perform OTDR testing on a link. Because the OTDR signal (probe pulse) is handled like a data signal, the time required for OTDR testing is typically about the same as the time required for other global network events, and is not considered an interruption of service to users. A network equipment includes an optical time domain reflectometry (OTDR) transmitter and receiver, each operationally connected to a link to transmit and receive, respectively, an OTDR signal. When an OTDR is to be performed, a network device operationally connected to the link actuates the OTDR transmitter to transmit the OTDR signal on the link during a determined test time based on a communications protocol of the link, during which data signals are not transmitted to the network equipment. A processing system processes the OTDR signal to provide OTDR test results.

The invention discloses a prediction method for a life cycle of a battery. The prediction method comprises the following steps: drawing a curve of the number of discharge and capacity fading rate; determining a function model of the capacity fading rate Qloss of the battery and the number of discharge N of the battery; substituting data of a certain impact factor impacting the life of the battery into the function model, wherein Qloss is 50-80 percent of the nominal capacity of the battery; calculating to obtain the expected cycle period N of the battery. According to the prediction method disclosed by the invention, as long as little cyclic test is performed on the battery, the residual life of the battery can be judged, and therefore, the test time is greatly shortened and the test cost is greatly reduced; the objective condition of capacity fading during the actual use process of the battery can be truly and comprehensively described, the life and the residual life of the battery can be obtained, the performance of the battery can be helped to be determined, and the life of the battery is prolonged. As the established model is universal, the prediction method disclosed by the invention is suitable for establishing life fading models of various storage batteries.

The invention relates to a rock sample detection and data acquisition system. The system can realize elastic parameter test of a rock sample in the state of gas adsorption; in the system, a three-shaft pressure cabin is connected with a gas supply and metering control device for absorbing samples in the cabin and accurately metering absorption quantity, moreover, an ultrasonic transducer is installed on a cap of the (high) pressure cabin and integrated with an ultrasonic wave transmitting/receiving device so that the test of elastic parameters of methane absorption on coal can be realized truly. The system can automatically and continuously test in the processes of gas absorption and gas enrichment, thereby ensuring a consistent test environment, acquiring an absorption quantity and elastic parameter relation curve, improving test accuracy and efficiency and saving test time and cost. The rock sample detection and data acquisition system integrates methane enrichment mechanism simulation and rock physical property test, can be applied to seismic prospecting method research on coalbed methane and shale gas, mine advanced detection, coal mine safety research and the like.

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 method for predicting the life of a solid tantalum electrolytic capacitor, which comprises the following steps of: 1, collecting current degradation data; 2, determining a degradation track model and a degradation accelerating model; 3, extrapolating the degradation track model to obtain the pseudo-failure life of each sample; 4, performing hypothesis test of pseudo-life distribution and the estimation of unknown parameters; 5, determining the relation of population parameters of the pseudo-life distribution and a stress level; 6 estimating the population parameters of the life distribution of a tantalum capacitor under the normal stress by extrapolating; and 7, determining the average life and reliability curve of the tantalum capacitor. The method has novel concept and simple programs and does not need life tests, the test time can be shorted, the test cost can be saved, and the problem of disharmony between the prediction of the conventional life and engineering is solved, so the method has wide application prospect in the technical field of life prediction.

A new digital architecture for metallic pipe and cable locators, providing accurate estimation of the fundamental locate parameters, electromagnetic signal strength and signal direction, and utilizing a nested Digital Phase-Locked Loop (DPLL) structure is disclosed. The obstacles to signal direction measurement in low SINR environments using the signal select method are overcome and a more precise phase comparison between the carrier and the FM modulation signals is obtained. The architecture further significantly reduces analog front-end hardware requirements, offers wider resistance to component tolerances, lower calibration and test time, and provides flexible frequency selectivity. Locators according to the present invention provide accurate estimation of the fundamental physical parameters of line location (electromagnetic signal strength and signal direction) in extremely noisy environments, using Digital Signal Processing (DSP) methods.

Circuits and methods that enable screening for defective or weak memory cells in a semiconductor memory device. In one aspect, a semiconductor memory device comprises first and second drivers for a SRAM cell. The first driver is connected between a power supply voltage and the cell, which supplies the power supply voltage into the cell in response to a cell power control signal. The second driver is connected between the power supply signal and the cell, which supplies a voltage lower than the power supply voltage into the cell in response to the cell power down signal. A method for screening for defective or weak cells does not require a time for stabilizing a circuit condition after voltage variation to supply the voltage lower than the power supply voltage from a conventional tester because the cell power down signal activates a driver that causes a supply voltage that is lower than the power supply voltage to be loaded directly to the cell, which results in a reduction of the test time for screening defective cells.

The invention relates to a high-speed dynamic simulation test method used for an electric mainshaft bearing. The electric mainshaft bearing comprises a frame, a main body pedestal, an axial loading cylinder, a test head assembly, a main body gland, a radial loading cylinder, a shaft coupling, a protecting hood, an electric mainshaft, a lubricating oil pipe, an axial loading oil pipe, a vibration sensor, a radial loading oil pipe and a temperature sensor and also a final assembly of all the parts. A hydraulic loading system is started to provide pressure oil to the axial loading cylinder and the radial loading cylinder, the electric mainshaft drives a test mainshaft to rotate, the radial loading cylinder exerts radial force on a first test accompanying bearing and a second test accompanying bearing through a radial loading sleeve, and the radial loading cylinder exerts axial force on a first test bearing and a second test bearing through an axial loading sleeve. The entire test is controlled by a computer to display parameters of the rotating speed, the axial load and the radial load, the oil pressure, the cooling water temperature, the bearing temperature, the bearing vibration, the power current of the electric mainshaft and the test time, and the parameters are saved in a computer database and analyzed.

The invention discloses a prediction method for the q-precentile life of an intelligent meter and relates to the technical field of reliability estimation of accelerated degradation data. The method comprises the following steps: performing degradation path modeling according to test data, and obtaining the pseudo life estimation of the intelligent meter under all stress levels according to the failure threshold value of given parameters; building a Weibull distribution-based accelerated degradation model of three parameters, such as temperature, humidity and electrical stress according to the pseudo life estimation results of the intelligent meter under all stress levels of an accelerated degradation test, so as to obtain the point estimation and covariance estimation of the acceleration model; and obtaining the lower estimation of parameter service life of the intelligent meter under a given reliability degree and a given confidence degree in normal use conditions according to the point and covariance matrix of the parameters of the accelerated degradation model. Due to the adoption of the method, the test time is effectively shortened, the test expense is reduced, and the quick and accurate estimation of a stable period of an accelerometer is realized.

The invention discloses a high-performance flat-type cellulose acetate/graphene blend forward osmosis membrane. 5 to 25 percent by weight of cellulose acetate, 1 to 15 percent by weight of additives, 0.01 to 2 percent by weight of graphene and mixed solvent of dimethylformamide, dimethylacetamide, or N-methylpyrrolidone and acetone are added into a dissolving tank according to a given sequence and are stirred and dissolved for 2 to 18 hours at the temperature of 5 to 75 DEG C to be uniformly mixed so as to prepare a forward osmosis membrane casting solution; the high-performance flat-type cellulose acetate/graphene blend forward osmosis membrane is prepared on a supporting material by adopting a phase inversion method. According to the forward osmosis membrane, 1M NaCl is used as a driving liquid, the deionized water is used as a raw material solution, the flux of pure water of the forward osmosis membrane is more than 21L/m<2> within the test time of one hour, and the salt flux in the reverse direction is less than 3.5g/m<2>.

A detached island effect test method and a device based on active frequency deviation relate to a test method and a device to test distributive new energy grid integration power supply, in particular to a detached island effect test method and a device based on active frequency deviation. Regarding the utility model, 25 cyclic waves form a major cycle. Chopped wave rate cf of the first 15 cyclic waves is 0, and variance trend of the frequency is tested. Under the circumstance that frequency tends to rise, frequency disturbance with the chopped wave rate of cf is added in the grid frequency in the last ten cyclic waves, and initial value cfmax of the chopped wave rate cf is positive. Under the circumstance that the frequency tends to reduce, frequency disturbance with the chopped wave rate of cf is added in the grid frequency in the last ten cyclic waves, and initial value cfmin of the chopped wave rate cf is negative. By adopting the invention, not only the operation probability of the detached island tested is improved; but also testing time is reduced, and current harmonics injected into the grid is reduced.

Techniques are provided for use by implantable medical devices for controlling ventricular pacing using a multi-pole left ventricular (LV) lead. In one example, a single “V sense” test is performed to determine intrinsic interventricular conduction time delays (Δ_n) between the RV electrode and each of the LV electrodes of the multi-pole lead. Likewise, a single “RV pace” test is performed to determine paced interventricular conduction time delays (IVCD_RLn) between the RV electrode and each of the LV electrodes. A set of “LV pace” tests is then performed to determine paced interventricular conduction time delays (IVCD_LRn) between individual LV electrodes and the RV electrode. Optimal or preferred interventricular pacing delays are determined using the intrinsic interventricular conduction delay (Δ_n) values and a set of interventricular correction terms (ε_n) determined from the results of the RV pace test and the set of LV pace tests. With these techniques, overall test time can be reduced.

A tool to aid a test engineer in creating a concurrent test plan. The tool may quickly map test system resources to specific pins to satisfy the requirements of a concurrent test. The tool may project test time when such a mapping is possible. When a mapping is not possible, the tool may inform its user, including making suggestions of additional resources that could allow the test system to perform the test or suggestions for other variations in input parameters that would allow a mapping. The tool employs an assignment process in which groups of associated pins are identified, along with associated resource requirements for each group. Groups of test system resources that collectively fulfill a higher level requirement are identified and the assignment is made by mapping resource sets to resource groups, using ordering and matching heuristics to reduce processing time.

The invention discloses a test device of a model for manufacturing rock masses containing interlayers and a test method thereof. The test device of the model for manufacturing the rock masses containing interlayers comprises a semicircular angle device, an upper baffle, a lower baffle, a left side plate, a right side plate, a circular turntable, a core-drilling machine drill bit, a flat plate, a flat plate angle control rod, a fixed screw rod, a base plate, an interlayer model test piece, a U-shaped plate and a guide slot. The test method comprises the following test steps: arranging the rock masses according to an outline central line and fixing the rock masses; manufacturing interlayer materials and casting the model, fastening the test piece, drilling the core, replacing the core-drilling machine drill bit, changing the position of the test piece to drill repeatedly and cutting to obtain the test pieces with different height-diameter ratios or obtain the test pieces with different interlayer inclination angles; then carrying out mechanical test. The test device is simple in structure and suitable for manufacturing the test pieces with different interlayer thicknesses, inclination angles and height-diameter ratios; according to a core-drilling and cutting machining device, by making full use of the existing device, the influence on the mechanical properties of the test pieces caused by different conditions can be analyzed, coring of irregular rock samples taken in the site can be carried out directly, so that the test efficiency is improved and the test time is shortened.

The invention discloses an information safety penetration testing method for a distribution automation system. Penetration testing is carried out on a master station system, a distribution network terminal and a communication channel, the information system vulnerability penetration testing technology is fully used, the safety of the distribution automation system is evaluated by simulating the attack method of a hacker, and the information safety penetration testing method includes the active analysis for any weakness, technical defects or loopholes of the master station system, the communication circuit and the distribution network terminal. The information safety penetration testing method for the distribution automation system can be used for safety risk analysis work before the distribution automation system is connected to the internet, guidance is provided for finishing problem rectification and reformation and retest work of manufacturers with safety risks, and the method is high in pertinence and wide in test range. Compared with a traditional penetration testing method, the test time can be largely shortened, offline repairing events caused by safety problem failures after equipment is on line are reduced, the information safety penetration testing for the distribution automation system is realized, and the information safety penetration testing method can be applied to industrial control systems inside and outside the industry.

The invention discloses a tracking tester of indoor rotary tar hybrid material, which is characterized by the following: the rotary rack with rotary shaft is set on the floor of experimental table and in the environmental box; the top of rotary table pillar connects the experimental table panel; the speed adjustment motor contains electric rack, bearing support seat and heating pipe, which connects the rotary shaft through driving structure; the bottom of driving shaft is set on the bearing support seat; the rotary bearing is set between the rotary shaft and bearing support seat; the rotary bridge is set on the rotary shaft; the bearing sleeve and bearing are set between the rotary bridge and rotary shaft; rubber tyre column slide cylinder within at least one rubber tyre column is set on the rotary bridge; the weight block holder is set on the rubber tyre column to load the weight block and the rubber tyre is set on the bottom; the limitation column and at least two steel molds are set on the experimental table panel to assemble test piece of tar hybrid material with pad board among steel molds; the temperature controller is set on the exterior of environmental box. The invention shortens the test time and improves the efficiency, which can be used in the tracking-proof experiment of tar hybrid material pavement.

The invention discloses a built-in system test method of multiple static random access memory (SRAM) based on scanning test, belonging to the technical field of an integrated circuit design. Multiple SRAM to be tested are tested in the scanning mode and the built-in system test mode. In the scanning mode, all of the common triggers in the SRAM logic are replaced by the scanning triggers, and the scanning triggers are connected together to form a scanning chain. The test vector generated in the design stage is output by an automatic scanning test device, and the output of the chip is observed to judge whether the result is correct or not. In the built-in system test mode, through the starting of the built-in system test, the output signal is observed to judge whether the error is existing or not. In the method of the invention, too many logic circuits are not added the advantages of the scanning test and advantages of the built-in system test are combined, the system resource in maximum optimized, the test coverage is enhanced, the test time and test cost are saved, and the chip area saved.

The invention discloses a vehicle testing system and method. The system comprises a scene building platform, a driving state collecting device and a processor, wherein the scene building platform is used for building a traffic environment model according to the testing case, and building the vehicle model to be tested according to the vehicle parameters of the vehicle to be tested; the driving state collecting device is used for collecting the actual running state information of the vehicle to be tested and sending the actual driving state information to the processor; the processor is used for synchronizing the actual running state information to a to-be-tested vehicle model, and generating a control instruction of the vehicle to be tested according to the virtual driving state information of the vehicle model to be tested in the traffic environment model. Therefore, the system can carry out automatic vehicle driving test under the simulation environment; the test time is effectivelyshortened, and the research cost is reduced; the accidents that are likely to occur in a real environment can be prevented, and the safety of the test can be improved.

The invention discloses a multi-version test method and device for a web page product, which are used for accurately estimating time required for multi-version tests, improving the test efficiency of the multi-version tests and the accuracy of multi-version test results. The multi-version test method comprises the following steps: aiming at any reference index, obtaining an expected change value between the index value of the reference index and a benchmark version in each version to-be-tested; confirming test time required by each version to-be-tested respectively according to the expected change value; receiving the access request sent by each accessing user in the test time; allocating each accessing user to a corresponding version test bin according to a preset user shunting rule; recording the operation information of each accessing user according to any test version; carrying out statistical analysis; obtaining a test result.

The invention discloses a negative pressure osmosis test device which comprises a base, a soil sample ring, a porous permeable stone, a water storage container, an electronic balance, a vacuum pump, a pressure gauge and a sealed container, wherein the soil sample is arranged in the cylindrical soil sample ring, the upper end of a sample is connected with the water storage container, and the bottom end of the sample is connected with the sealed container and the vacuum pump; a pressure difference is formed at two ends of the soil sample through vacuum-pumping, and water seeps in the soil sample under the action of the pressure difference; an osmotic coefficient of the soil sample can be obtained through calculating the amount of water passing though the soil sample in unit time; a load applying piston at the upper end of the sample can apply vertical load so as to solidify the soil; osmosis tests of different solidifying pressures can be performed to simulate the seepage of the practical field soil under different stress environments; the osmosis test can be directly performed on the prepared soil sample. Therefore, the test device has the advantages of simple structure, convenience in use, quick and convenient test, and obviously shortened test time, and is particularly suitable for the osmosis test of low-osmosis soil samples.

The invention discloses a reliability acceleration test method of electronic products, and belongs to the field of reliability designing and testing. The method comprises steps of firstly presetting an acceleration test temperature change curve boundary according to working stress limit obtained via a routine test for reliability of an electronic product, carrying out simulating calculation of temperature acceleration factors, and modifying and determining initial acceleration test temperature stress change curves; and secondly, calculating vibration acceleration factors according to the initial acceleration test temperature stress change curves and a test profile of the routine test for the reliability of the original electronic product, calculating acceleration test vibration stress change curves according to the vibration acceleration factors, and according to the acceleration test vibration stress change curves, determining the final temperature stress change curves and determining acceleration test time. According to the invention, by following the thought of testing and examining working stress of a product and properly increasing test stress level, test time is shortened; a reliability test of the electronic product can be accelerated; and diversity and controllability of the acceleration factors are achieved.

The invention relates to a satellite automation test platform, comprising an automation scheduling module, an instruction transmission module, a data acquisition module, a data analysis module as well as a test rule database. The automation scheduling module automatically reads out and analyzes the test rule in the test rule database. The analyzed test logic transmits an excitation instruction to a satellite tested target through the instruction transmission module. The data acquisition module receives the satellite state data transmitted back by the satellite tested target, manages the satellite state data and at the same time forwards to the data analysis module. The data analysis module in accordance with the test rule criterion analyzes the satellite state data and transmits the analyzed result to the automation scheduling module, thus judging whether the next test rule is carried out or not until the finish of the test. The invention automatically executes the test rule, automatically transmits the excitation instruction, and automatically completes data interpretation, thereby enhancing the test quality and the test efficiency, decreasing the maloperation probability and shortening the test time.

The invention discloses a method for measuring high-temperature creep crack growth threshold value of material. The method comprises the following steps of: for a specific material, according to the creep crack growth test requirement, processing at least 6 standard compact tension specimens, performing crack prefabrication for the well processed at least 6 specimens on a fatigue performance tester, wherein the prefabricated crack length is 0.5 times of the width of each specimen; wedging a wedge-shaped block into an initial notch of each specimen, placing the headmost end of the straight part of the wedge-shaped block at the position of a loading line, providing displacement for the loading line, forming a stress-strain field characterized by a stress strength factor at the tip of the specimen crack, and providing a driving force for the creep crack growth, wherein the specimens with different initial stress strength factors grow after certain time under creep effect in high-temperature environment, and in the same time interval, the crack growth lengths are different; drawing for the different stress strength factors and the corresponding crack growth rates, and solving the creep crack growth threshold value of the material through an extrapolation method. According to the method provided by the invention, multiple specimens can be tested for one time, and thus, the test cost is greatly reduced and the test time is greatly shortened.

Embodiments of the present disclosure describe a method and an apparatus for testing an optical network, which may be applicable to an integrated OTDR and the field of optical network technologies. The method includes obtaining a maximum test time of a single group test; dividing a total test time into at least two groups of single group test time that is not greater than the maximum test time when the total test time is greater than the maximum test time of the single group test; performing the single group tests in sequence according to each single group test time; and instructing optical network equipment to restore to a normal working state when the single group test time corresponding to each single group test ends.

The invention relates to a Li battery capacity detecting method, a Li battery capacity fast detecting method, characterized in that: according to the charge-discharge curve of Li battery capacity, it makes fast detection for Li battery capacity. And the invention has feature of short test time.

The invention discloses a vehicle particle emission measuring device which comprises a particle concentration tester and a data recording and processing module. A tail pipe is sequentially connected with a sampling probe and a sampling dilutor before being communicated with the particle concentration tester, thereby forming a gas flux channel. The sampling dilutor is connected with a diluting control device. The particle concentration tester is connected with a vacuum pump. A pressure sensor and an exhaust flow-meter are arranged in the tail pipe respectively. The pressure sensor, the exhaust flow-meter and the particle concentration tester transmit signals to a data recording and processing module respectively. The invention also discloses a method employing the mentioned measuring devices for vehicle particle emission measurement. The device of the invention arrives at the amount of the mass of particle matters exhausted during the testing process by calculating the data collected by relevant devices, instead of weighing, and can reflect objectively the weight of particle matters exhausted during any test time period, which in turn can play an important role in making effective control tactics.

The invention relates to a method for testing the acceleration reliability of an antiskid brake control box of an airplane. Temperature stress, vibration stress and humidity stress are comprehensively applied, and an electrifying working condition capable of stimulating a fault is selected in a test process, thus the working frequency of the control box is improved, the fault hidden trouble of the control box is stimulated, and the test time is shortened. The test process is carried out according to a test cross section in a circulating way until the required reliability index is met. In the method provided by the invention, the electrifying working condition and the working frequency in service are converted into the test time, and the working frequency adopted in the test process is higher than the actual working frequency in service. After the test is finished, the met reliability index is evaluated according to a method in GJB (Guo Jun Biao) 1407 and the confidence degree recommended in GJB1407, and the confidence degree for evaluating the reliability index is 90%. In the method provided by the invention, a pulsating current of 0-40mA is applied, fault hidden troubles of the control box in various working conditions are verified, an acceleration reliability test on the control box is realized, and test data can be used for evaluating the reliability index of the control box.

A microcomputer includes a memory such as a flash memory; a logical circuit such as a CPU; a test ROM storing a test program for testing at least the logical circuit; and recording means capable of storing, as a flag, the result of testing at least one of the memory and logical circuit. The memory and the logical circuit are tested simultaneously to shorten test time. The test-result flag is checked upon being stored. When the flag indicates failure of the logical circuit, testing of the memory is aborted, and vice versa.

The invention discloses an in-loop simulation test system and test method for a vehicle management system. The test system comprises a hybrid power system stand and an in-loop test bench for being in communication connection with a vehicle management system to be tested. The hybrid power system stand comprises an engine and a main motor which are mutually connected as well as a load dynamometer which is connected with the main motor. By enabling an actual hybrid power drive system to be combined with a conventional hardware-in-loop simulation system, the vehicle management system to be tested is allowed to be in a real vehicle power drive system in a simulation manner, thereby improving vehicle management system software development quality and precision, reducing real vehicle road test times, reducing development time and cost, and reducing road test process risk; meanwhile, vehicle power performance test can be achieved; and through matching optimization of the power system, the whole performance of the vehicle is improved.