182 results about "Exact test" patented technology

The invention provides a wireless terminal antenna performance testing system which comprises an anechoic chamber, a power detector and a digital analog converter, wherein the anechoic chamber comprises a shielding box, a wave absorbing material mounted on the inner wall of the shielding box as well as measuring antennas; the power detector is connected with the measuring antennas. According to the wireless terminal antenna performance testing system provided by the embodiment of the invention, by means of the power detector and the digital analog converter, a task for converting a radio-frequency signal into direct read data, namely, a digital signal can be finished; a special measuring instrument is omitted, a comprehensive measuring instrument is not required to participate in the whole process, and the configuration cost of the testing system is reduced; meanwhile, the antenna performance is accurately tested under the shielding condition in a non-signaling mode, the waiting time for connection establishing between the measuring instrument and a to-be-measured wireless terminal is saved, outside electromagnetic interference is reduced, the testing efficiency and the accuracy are improved, and the system is particularly applicable to testing of the antennas of a wireless terminal.

The invention relates to a rolling bearing error auto diagnose system. It takes testing analysis and kurtosis analysis to the bearing vibration, and calculates the kurtosis by virtual device and DSP, analyzes and compares the spectral configuration to accurately measure the acceleration and speed of bearing vibration, and achieve accurate analysis to automatically judge the place of the error.

The invention discloses a test method for performing rock direct stretching by using an axial centering positioning device. The positioning device comprises an adhesion centering positioning device and a stretching centering positioning device which are matched with each other. The adhesion centering positioning device is used for eliminating the eccentricity caused by the adhesion of a test piece; the stretching centering positioning device is used for eliminating the eccentricity generated in the test piece stretching process; the tensile strength and the ultimate tensile strain and a tensile stress-strain curve of a rock can be accurately tested by using a direct stretching test method. The device is simple in structure, convenient to operate and easy to assemble and disassemble; the problem about the eccentricity when the rock test piece is adhered and stretched is solved; the test method can accurately test the tensile strength of the rock and also can effectively test the ultimate tensile strain and the tensile stress-strain curve of the rock.

Systems, apparatus and methods for proximity determination between transceivers, such as mobile devices, are presented. Proximity may be a logical combination of geographic proximity, radio proximity and/or cellular proximity. Proximity may be determined using a low overhead coarse test followed by a more intensive accurate test. Proximity may be determined indirectly via one or more intermediary transceivers having a predetermined relationship.

The invention discloses a method for testing microwave dielectric property of a high-loss dielectric substance. According to the method, a small-size sample to be tested is used, and a large-size and low-loss reference sample is introduced, so that the high loss of the sample to be tested is reduced, and the resonance peak is ensured to be observed. According to the changes of the resonance peak of a TE01 delta model when only the reference sample is arranged in a resonant cavity and the reference sample and the sample to be tested are simultaneously arranged in the resonant cavity, and the distribution of an electromagnetic field under the two conditions can be simulated by using finite element analysis, so that the dielectric constant and the dielectric loss of the sample to be tested at the resonance frequency can be obtained. According to the method, the characteristics of high test precision of the microwave resonance method is utilized, and the influence on the distribution of the electromagnetic field caused by the introduction of the sample to be tested, is considered, so that the defects of low precision of other conventional methods can be overcome from the test principle, and the accurate test of the microwave dielectric property of the high-loss substance can be realized. Meanwhile, the resonance frequency is decided by the reference sample with large size, so that the frequency conversion test can be realized by changing the dielectric constant or the size of the reference sample.

The invention discloses heterodyne technology based device and method for testing the half-wave voltage of a phase modulator. The device comprises a laser, a first 50-percent coupler, a phase modulator, an acousto-optic frequency shifter, a second 50-percent coupler, a photoelectric detector, a vector analyzer, a first signal generator and a second signal generator; the laser is sequentially connected with the first 50-percent coupler, the phase modulator, the second 50-percent coupler, the photoelectric detector and the vector analyzer, the first 50-percent coupler is sequentially connected with the acousto-optic frequency shifter and the second 50-percent coupler, the phase modulator is connected with the first signal generator, and the acousto-optic frequency shifter is connected with the second signal generator. The invention provides the method for accurately testing the half-wave voltage of the phase modulator, the carrier component in phase modulation can be effectively inhabited by utilizing the half-wave voltage obtained through testing, the back-scattered noise in a resonance type optical gyroscope is reduced, the invention provides a feasible method for improving the precision of the resonance type optical gyroscope and has important scientific meanings and application value.

To provide a measuring method capable of measuring even a large-area stacked photoelectric conversion device such as a module or array either indoors or outdoors and accurately measuring the photoelectric conversion characteristics using an inexpensive measuring system, the photoelectric conversion characteristics of a photoelectric conversion device under irradiation light in a plurality of spectral states and a shift of the short-circuit current of each component cell of the photoelectric conversion device from the standard test condition are estimated, and the measured photoelectric conversion characteristics and the estimated shift are compared, thereby obtaining the photoelectric conversion characteristics of the photoelectric conversion device in the standard test conditions.

The invention discloses a method for accurately measuring the cable force of a short boom of a boom arch bridge. A relevant measuring model is designed, boundary conditions of the boom are simplified into damping and spring supporting of a simple support boom in a corresponding transverse position, the boom is further equivalent into a simple support stretching rope with the equivalent calculation length, a mass block is additionally arranged in the middle of the boom, a vibration balance equation of ropes is set up before and after the mass block is additionally arranged in the middle of the boom, an algorithm of recognizing the equivalent calculation length L0 of the boom by using measured frequencies of the boom before and after the additional mass block is arranged is finally and optimally formed, and therefore the method for accurately measuring the cable force is set up. According to the method for accurately measuring the cable force, measurement is convenient to conduct, and a user only needs to conduct vibration frequency measurement twice on the boom before and after the additional mass block is arranged. The measuring accuracy is high, and the difficult problem of accurately measuring the cable force of the short boom can be well solved. When the method is applied to the field of detection or construction monitoring of boom arch bridges, the cable force of the short boom can be rapidly and conveniently measured at high accuracy, and therefore reliable essential data are provided for detection and monitoring of the boom arch bridges.

The invention discloses a method and device for precisely testing rolling resistance of tyres and belongs to the field of tyre kinetic characteristic testing tests. By means of the method and device, the problem that an existing tyre testing machine with a multi-component-force sensor installed can not precisely measure tyre rolling resistance. The method for testing the tyre rolling resistance includes the steps that the state of a tyre in the state that the longitudinal force is zero is set according to a side inclining angle and vertical load required for testing, zero clearing processing is carried out on each force output channel of the tyre multi-component-force sensor, and datum points for testing the tyre rolling resistance are accordingly chosen so as to test the rolling resistance; in this way, the crosstalk of the vertical load on the rolling resistance can be eliminated, and the purpose of precisely testing the tyre rolling resistance is achieved. It can be achieved by the testing device that the tyre is in the state that the longitudinal force is zero. The method and device can be widely applied to tyre characteristic test tables with multi-component-force sensors installed and is suitable for precisely testing rolling resistance of all kinds of tyres.

The invention discloses a ramp testing device, comprising: a pedestal, comprising two supporting rods arranged in parallel, wherein a plurality of fixed rods are arranged between the supporting rod, and both ends of the supporting rod are provided with sliding chutes; a planar ramp and a lifting rod, wherein the planar ramp is parallel to the plane of the bottom surface, both ends of the lifting rod are fixed on the planar ramp and the bottom surface, and the lifting rod is vertical to the plane of the bottom surface; two identical inclined plane ramps, wherein one of the margins a and b of the two identical inclined plane ramps is respectively hinged with the two parallel margins of the planar ramp, the other margins c and d of the two identical inclined plane ramps are connected with the sliding chutes through slide blocks, a is parallel c and b is parallel to d. The device has simple structure, and is easy to manufacture and convenient to use, maintain and detach; the stability is good; and the height of the planar ramp and the angle between the inclined plane ramp and the ground can be accurately adjusted, which helps to accurately test the performance of robot.

The invention relates to a vehicle mass analysis system standard device for simulating exhaust emission. The standard device composes an operating console consisting of an upper computer and a singlechip, a gas source and a standard gas control unit, wherein standard gas output by the gas source enters the standard gas control unit; a mixed standard gas outlet of the standard gas control unit is connected with a gas inlet of a five-gas analyzer in a vehicle mass analysis system; a standard concentration diluting oxygen outlet of the standard gas control unit is connected with a diluting oxygen inlet of a flow analyzer in the vehicle mass analysis system; and the standard gas control unit is controlled by the operating console. According to the standard device, mixed standard gas and standard concentration diluting oxygen in an accurate proportion is used as reference gas; and meanwhile, a high-accuracy proportional pressure adjusting valve is arranged in the standard gas control unit, so that the flow requirement of the standard gas can be accurately controlled, and the static response characteristic of a zirconium oxide sensor can be accurately tested.

A measurement of thickness of a metal oxide layer on a solder ball connection during semiconductor fabrication is demonstrated by an in-situ capacitance measurement of the oxide layer. A linear relationship is shown between the reactance of the metal oxide and its thickness. This linearity is derived empirically, and correlated to Auger Spectroscopy test results for accuracy. The linear relationship demonstrated with these measurements exhibits a linear correlation coefficient, R2, greater than or equal to 0.974. This close, linear relationship allows for accurate testing of the oxide thickness using standard electrical parameter measurements during wafer fabrication.The method requires the determination of an analytical relationship between dielectric thickness and dielectric capacitance; the performance of an in-situ test of the dielectric layer capacitance including measuring the dielectric layer capacitance; and, the calculation of the dielectric layer thickness by using reactance values, calculated from the measured dielectric layer capacitance, as a variable within the analytical relationship.

The invention discloses a special test block for ultrasonic creeping wave flaw detection of butt-jointed welding seams of a special steel small-diameter tube, which comprises a tool body and a tool shank, wherein the tool body comprises a tool bit, a tool back and a tool edge, the tool shank is connected to the tool back side of the tool body through a connecting body, the tool back and the tool edge of the tool body are convex arc surfaces of which the curvatures are the same as that of an outer circle of the small-diameter tube, and the side surface of the tool body is provided with three transverse through holes; the tool bit is formed by concentrically and co-directionally overlapping two concentric sectors of which the diameters have one-time difference, and one radial edge of each of the sectors is coincidently arranged with the tool back; and the thickness of the tool shank is the same as the wall thickness of the small-diameter tube, the upper and lower surfaces of the tool shank are convex and concave arc surfaces of which the curvatures are the same as those of the outer circle and an inner circle of the small-diameter tube respectively, the convex and concave arc surfaces of the tool shank are provided with straight grooves with equal-depth openings respectively, and the side surface of the tool shank is provided with two transverse through holes. The special test block has a simple and practical structure, and can accurately test parameters of a creeping wave probe, check monitoring process parameters, and be matched with a creeping wave flaw detection process to realize the ultrasonic creeping wave flaw detection of the butt-jointed welding seams of the special steel small-diameter tube.

A test mode control device using a nonvolatile ferroelectric memory enables a precise test of characteristics of a memory cell array by changing a reference voltage and timing regulated for a memory cell test in a software system without extra processes. In an embodiment, test modes and arrangement of data pins are programmed using a nonvolatile ferroelectric memory, and addresses, control signals and arrangement of data pins are regulated in a software system depending on a programmed code. As a result, characteristics of a cell array can be precisely tested without extra processes.

Provided is a testing apparatus that accurately tests changes in threshold value of a transistor. The output of an operational amplifier is connected to the gate of a transistor to be tested, and the source of the transistor to be tested is negatively fed back to the negative input terminal of the operational amplifier. By applying desired voltage from a DAC to the positive input terminal of the operational amplifier, the operational amplifier operates so as to maintain a current flowing in the resistor at a constant value, thereby performing a test where the current flowing in the transistor to be tested is maintained at a constant value.

This invention is a kind of method to measure the H2 storing material's PCT curved line. Especially it offers a kind of precise testing method which has wide use area to measure the H2 storing material's PCT curved line. This invention uses the volume method, that is to say, we will calculate the amount of H2 absorbed of the H2 storing material corresponding to different H2 pressure according to MBWR equation by continuously recording each part of pressure and temperature of H2 during the process of the H2 storing material absorbing or sending out H2, so as to get PCT curved line. After that we will realize the compression divisor's whole process of calculating and drawing picture by computer programming. As this invention has thought about the effect of the H2 storing room's temperature fluctuating, the PCT curved line will still be credible as though part of the room can not realize stable temperature. To sum up, this invention has good use value, making the instrument simple and easy to operate. At the same time we get higher degree of belief when we check the PCT curved line of carbon Nanometer pipe and V and so on which is the H2 storing material having high balance pressure.

The invention discloses a test method and system for page jump time of an intelligent terminal. The method comprises the steps that S400, test equipment receives a recorded video, sent by the to-be-tested intelligent terminal, of a page jump test process; S500, the test equipment performs screen capture on the video according to a preset time interval to obtain multiple test pictures; S600, the test equipment acquires a test starting point picture and a test ending point picture corresponding to the test starting point picture according to the test pictures; and S700, according to the test starting point picture and the test ending point picture corresponding to the test starting point picture, the test equipment calculates a time difference value, and the time difference value is used asa test result. Through the test method and system, the page jump process can be visually reflected, and the page jump time can be precisely tested.

The invention belongs to the technical field of water surface aircrafts, and relates to a water surface aircraft wave-collision load all-machine non-power model water pool test system and method. A wing fixing device (2) limits the rolling angle of a model, a gravity center fixing device (3) and a tail wing fixing device (12) limit the pitching angle of the model, and a trailer side bridge (8) limits the height of the model from the water surface. Before the model test, the height of the model from the water surface and the initial longitudinal inclination angle are adjusted and recorded. During test, a trailer pulls to enable the model to run to the required speed, the speed of the trailer, the height of the model from the water surface, the overload and the pressure value are collected and recorded, and the collected data information is analyzed, so that the wave-collision load data of the whole-machine non-power model of a water surface aircraft with fixed attitude when dragged on the wave surface can be accurately tested, and the collision wave load during the near-water surface flying can be accurately forecasted. The strength and the structural design of the water surface aircraft can be better verified. The method is practical and feasible, and is simple to operate, reliable in test result and wide in application range.

The invention belongs to the technical field of flying probe tests, and particularly discloses a resistor-capacitor measurement module applied to the flying probe tests. The resistor-capacitor measurement module comprises a resistor test module, a capacitor test module and a control processing module. The resistor test module is used for testing a resistor value between same networks on a test substrate, and the capacitor test module is used for testing a capacitor value between different electric networks to the earth on the test substrate. The control processing module is respectively connected with the resistor test module and the capacitor test module, and is used for generating sine waves. The frequency and amplitude of the sine waves both are controllable, and the control processing module is used for controlling switching and electing between functions of the resistor test and the capacitor test, testing gear selection and probe assembly selection, receiving test data of the resistor test module and the capacitor test module for processing, and outputting test result data. The resistor-capacitor measurement module can be imbedded in a flying probe test device main system, realizes automatic probe selection test through software control, is quick in gear selection, accurate in test, and has the advantages of being high in test speed, and short in response time. The test accuracy can meet the technological requirements of the flying probe test.

The invention provides an intelligent substation secondary loop comprehensive performance test system and a working method thereof. The transmission delay of a secondary loop of an intelligent substation is mainly composed of several parts: sampling signal pre-processing delay of an electronic transformer, processing delay of an integrator, synchronous operation and data processing operation delayof a merging unit and transmission delay of a switching network and the like. The invention designs a high-precision timing synchronization implementation method, hardware design of a message acquisition module, a switch value acquisition module and a control system for the intelligent substation secondary loop comprehensive performance test. The system realizes accurate test of intelligent substation secondary loop comprehensive performance and provides technical support for asynchronous error check of the electronic transformer.

The invention provides a method for pressure analysis during an application software performance test. The method comprises the following steps: production data of a typical on-line service application system is analyzed based on pressure model analysis of TPS during the software performance test so as to obtain the TPS of a key service, when the number of system users increases, the access pressure of the system also increases, the pressure of the system is proportional to a TPS value, the analyzed TPS is multiplied by a pressure multiplication factor which possibly increases to obtain a pressure design index to be simulated in the performance test so that the pressure of the system is really simulated, and the performance of the system at the pressure is tested. When the number of the system users increases, the access pressure of the system also increases, the pressure of the system is proportional to the TPS value, the TPS value can be estimated after the number of the users increases, and the TPS value is taken as a target for generating pressure during the performance test, which can really simulate the pressure on the system from a great number of user operations, accurately test the handling capacity of the system, and help make a decision to expand the application system or not.

The invention provides a testing method used for measuring the water content of iron ore crystal water, which belongs to the field of detection technique and is used for solving the problems that the existing measuring equipments used for measuring the water content of the iron ore crystal water are complex and have high expense. The method of the invention consists of the steps as follows: preparing samples, samples entering the furnace, heating the samples, cooling the samples, and calculating the test results, etc. Based on the characteristic that the crystal water in limonite can be completely decomposed and the little carbonate in limonite is decomposed under the temperature of about 400 DEG C, the content of the iron ore crystal water is calculated according to the difference of the dried ore mass and the mass of the ore after the crystal water is overflowed; the method can utilize nationally specified coke reaction equipment generally used by current iron enterprises to carry out the measurement of crystal water of limonite, sufficiently plays the test functions of the existing equipments, and provides a feasible mean for self-measuring the iron ore crystal water for most iron enterprises without increasing other instruments. By the verification of a plurality of contrast tests, the method of the invention has the advantages of simpleness and feasibility, and exact test data.

The invention discloses an APD voltage and temperature curve testing device and a use method thereof. The device mainly comprises a computer, an MCU (Microcontroller Unit), a DAC (Digital-to-Analog Converter), an ADC (Analog-to-Digital Converter), an APD power supply, a current and voltage converter, a temperature sensor, an angular position digitizer, an adjustable thermostat and a light source. The invention realizes automatic accurate test on the basis of the MCU and meanwhile has the advantages of simple circuit, low cost, safety, reliability and the like, thereby being suitable for testing APD voltage and temperature curves in multiple fields of communication, optical fiber sensing and the like.

The invention discloses a steel strand mechanical testing device in an ultra-low-temperature environment and a testing method thereof. The device comprises a universal testing machine and a low-temperature box arranged between an upper jaw and a lower jaw of the universal testing machine; through holes which are opposite to each other and are used for the passing of a connecting component connected with a tested steel strand are respectively formed in the upper surface and the lower surface of the low-temperature box; the connecting component is connected with the two ends of the tested steel strand and consists of a force transfer rod, a connection self-locking component and a self-locking clamp head. According to the steel strand mechanical testing device in the ultra-low-temperature environment and the testing method thereof, the aim of completely arranging the tested steel strand in the low-temperature box is fulfilled by utilizing the connecting component for the tested steel strand; the temperature of the steel strand is distributed uniformly; mechanical parameters can be tested accurately; the test accuracy is improved, wherein the connecting component comprises the connection self-locking component, the self-locking clamp head and the force transfer rod, so that the overall device is simple in structure, easy to machine and convenient to detach and can be reused; moreover, the testing method is simple and is convenient to operate; the test accuracy is improved, and the test efficiency is guaranteed, and therefore, the device and the method can be widely applied to steel strand mechanical tests.

The invention provides a tumor mutation site screening and mutual exclusion gene mining method, which comprises the following steps: (1) filtering a vcf file and an output file of ANNOVAR annotation software; (2) carrying out the descriptive analysis of different experimental groups of mutation sites; (3) constructing a mutation gene matrix; and (4) carrying out mutual exclusion and joint mutation analysis on the generated mutation gene matrix on the basis of a Fisher exact test to determine a mutual exclusion and joint mutation gene. The mutation site is filtered by the annotation information of the mutation site and basic parameters including a sequencing read number, site sequencing depth and the like, and then, the obtained mutation site is subjected to the descriptive analysis of different experimental groups of mutation modes and the mining of a mutual exclusion and joint mutation gene set.

Methods and systems for improving a shopping experience are described. A customer brings items of clothing to try on in a dressing room. The customer's exact location is provided to the store clerk with the assistance of a beacon located in the dressing room. The store clerk also knows the exact items the customer has brought into the dressing room because a reader in the dressing room reads tags associated with the items. The customer may be provided with information on suggested products, such as alternative or complementary items to the items the customer selected.