426results about How to "Improve test accuracy" patented technology

The utility model discloses an optical module test system which comprises a rack, a mechanical arm is arranged on the rack, and a feeding station, a code scanning station, an end inspection station, a plugging station, a test station and a discharging station are arranged on the periphery of the mechanical arm. The plugging station is used for connecting or separating the optical module and the optical fiber; the code scanning station is used for identifying and acquiring information of the optical module; an end detector is arranged on the end detection station; a high and low temperature detector is arranged on the test station; the manipulator is arranged to transfer materials among the stations, automation of the optical module testing process is achieved, manual operation is reduced, testing efficiency and accuracy are improved, and labor cost and personal errors are reduced. In addition, all the stations are arranged around the manipulator, the structure is compact, the occupied space is small, the system is particularly suitable for use scenes with high requirements for the site and the occupied area, meanwhile, operation of the manipulator and circulation of materials are facilitated, and the operation efficiency of the system is improved.

Embodiments of the present disclosure disclose a loudspeaker characteristic parameter testing method, device, electronic equipment and readable medium. A specific implementation of the method comprises: obtaining a target signal group, wherein the target signal group comprises a target voltage signal, and the target signal group further comprises at least one of a target sound pressure signal and a target current signal, the target voltage signal is a voltage signal of a loudspeaker to be tested for loudspeaker characteristic parameters, which is fixed in a loudspeaker characteristic parameter testing device, the target sound pressure signal is a sound pressure signal collected at an observation point position opposite to the loudspeaker in the loudspeaker characteristic parameter testing device, and the target current signal is a current signal of the loudspeaker to be tested for loudspeaker characteristic parameters; determining a fitting equation according to the target signal group and a pre-constructed fitting model; and performing loudspeaker parameter fitting on the fitting equation to determine a loudspeaker characteristic parameter. The implementation improves the testing accuracy of the loudspeaker characteristic parameter.

The present application belongs to the technical field of geotechnical engineering test, and relates to a system and method for rapidly determining the permeability coefficient of low-permeability soil in situ, which comprises an inner sleeve, an outer sleeve, a pressurizing device and a pore water pressure sensor. The inner and outer sleeves are simultaneously driven into the soil to a specified depth, and then the outer sleeve is further pressed to form a sealed test cavity; water is injected into the inner sleeve and the top is closed, and a stable air pressure is applied through the pressurizing hole to accelerate the permeation; the pore water pressure sensor pre-embedded at the bottom of the outer sleeve is used to monitor the transient change data of the pore water pressure at the soil permeation interface in real time and in situ, instead of the traditional external water level change. Based on the monitored pressure decay data, the soil parameters can be calculated. Compared with the prior art, the present application discards the unreliable water level observation link, shortens the test time from several days to several hours, fundamentally avoids the errors introduced by the capillary effect and hysteresis effect, and realizes the rapid and high-precision test of low-permeability soil in situ.

This utility model discloses a test lightbox for image acquisition in vision-based color fastness testing of textiles. It includes a first housing with a tray on its bottom wall. The upper surface of the tray has a groove for holding a sheet of material to be tested. A window communicating with the interior space of the first housing is also provided on one side of the first housing. The tray is slidably connected to the bottom wall of the first housing. An illumination source is also provided inside the first housing. A second housing is located on top of the first housing. The second housing contains a camera device and a power module. A mounting through-hole communicating with the interior space of the first housing is provided on the bottom wall of the second housing. The camera device is embedded in the mounting through-hole so that its field of view covers the tray inside the first housing. This test lightbox can provide highly consistent and repeatable image data, laying a reliable foundation for subsequent image analysis and color fastness assessment, thereby improving testing accuracy and efficiency.

This utility model relates to a fixture for testing the opening force of aluminum foil easy-tear caps, including a base plate and an inclined panel integrally formed at a 45° angle to the base plate. An aluminum channel slide rail is fixedly mounted on the inclined panel, and symmetrically slidable clamps are arranged on the aluminum channel slide rail. The clamps are fixed by bolts, and the aluminum foil easy-tear cap to be tested is clamped between the symmetrically arranged clamps. This utility model has a simple structure and is easy to operate, enabling rapid testing of the tearing force and full opening force of aluminum foil easy-tear caps. Furthermore, the clamps are movable on the aluminum channel slide rail, allowing testing of aluminum foil easy-tear caps of different diameters.

A device for measuring in-situ drilling rock hardness based on a high-pressure water pressure head comprises a hydraulic power system, a data acquisition system, a test probe and a push rod, the front end of the push rod is connected with the rear end of the test probe; the hydraulic power system comprises a manual hydraulic plunger pump; the manual hydraulic plunger pump is connected with the test probe through a reversing three-way valve; the data acquisition system comprises a data recorder, a displacement sensor and a pressure sensor, the displacement sensor and the pressure sensor are arranged on the manual hydraulic plunger pump, and the displacement sensor and the pressure sensor are connected with the data recorder through a signal receiver. The device is simple in structure, convenient to operate and capable of measuring the rock strength of different drill holes, different depths and different point positions so as to obtain the distribution condition of the roadway rock strength, the measuring result is close to the on-site rock mass, a water medium is used for pressure transmission, the measuring process is simple, convenient, environment-friendly and safe, errors in the processes of sampling, processing and the like are avoided, and the working efficiency is improved. And the measurement cost is reduced.

The embodiment of the invention provides a multi-module automatic testing method and device, electronic equipment and a storage medium, a to-be-tested target function module and a corresponding association module are obtained, and the association module is called in the operation process of the target function module and can influence the operation result of the target function module; according to the execution logic of the target function module and the association module, generating a contract file of the association module, the contract file being used for representing an expected operation result corresponding to the target function module when the association module executes at least one execution action; and when the test of the target function module is executed, obtaining a test result of the target function module by configuring the contract file. By generating the contract file corresponding to the association module and configuring the contract file when the target function module is tested, the test case corresponding to the association module is automatically obtained and executed, so that the efficiency and accuracy of software testing are improved.

The invention discloses a high-speed heavy-load working condition bearing dynamic stiffness testing device and testing method, and relates to the field of bearing testing. The invention solves the problems that the existing bearing dynamic stiffness test technology and equipment only can load in a single direction, cannot simulate axial and radial composite loading, depends on contact transmission, is insufficient in heavy load bearing, lacks system vibration error suppression measures, and is poor in reliability. And the high-precision test requirement of the independent rolling bearing under the high-speed heavy-load composite working condition is difficult to meet. A shafting supporting module is arranged on the upper portion of a test bench support, a measuring module is located over the shafting supporting module, an axial loading module and a radial loading module apply axial force and radial force to a tested bearing respectively, and a driving module drives a supporting shaft and an inner ring of the tested bearing to rotate. Axial and radial composite loading under the high-speed heavy-load working condition can be achieved, axial and radial displacement can be monitored synchronously, system errors are reduced, and high-precision measurement of the dynamic stiffness of the bearing is achieved.

This invention discloses a method and system for testing distribution network cabinets based on IEC104 network communication, comprising: establishing an IEC104 communication connection, acquiring parameter information, and creating control and feedback data structures; sending ASDU150 control messages, receiving ASDU153 and ASDU152, and writing them into two types of data structures; extracting feedback time series data, inputting it into an improved TadGAN model, and generating reconstructed sequences and errors; establishing a control feedback phase-locked window, extracting feedback messages within the window, and generating corresponding data sets; listening to feedback messages under zero control conditions, recording change information, and generating passive disturbance data sets; performing analysis and judgment based on multiple types of data, and outputting input / output acquisition link testing and diagnosis. This invention achieves automated testing and anomaly diagnosis of the input links, output links, and acquisition links of distribution network cabinets through time-series correlation analysis of IEC104 control messages and feedback messages and feedback time series reconstruction processing.

The utility model discloses a seat movable armrest rotation durability detection device, which comprises a frame, a support assembly and rotation modules are arranged in the frame, at least one group of stations for loading seats are formed on the support assembly, the number of the rotation modules is the same as the number of the stations, and the rotation modules are in one-to-one correspondence with the stations. The rotating modules are connected into a power module through corresponding air pipes, and the rotating modules can drive the movable armrests of the seat to rotate in an opening and closing mode through control of the power module. The device further comprises a control system, the power module is in electric signal connection with the control system, and the power module can be controlled through the control system. According to the utility model, the rotation durability test is carried out on the movable armrest of the seat, the structure is simplified, the cost is reduced, and the test accuracy is improved.

The utility model discloses a self-adaptive force stabilizing device for characterizing a mechanoluminescence cycle process, and belongs to the technical field of material testing. According to the device, collaborative operation is achieved through a reciprocating testing mechanism and a force loading mechanism which are in linkage design; the reciprocating testing mechanism drives a lead screw transmission assembly through a servo motor to drive a single-axis moving platform, a pressure digital display and a material to achieve reciprocating friction in the y-axis direction; the force loading mechanism pulls a sliding platform to slide on a sliding rail through a spring, a round-bottom quartz tube is arranged at the end of the force loading mechanism and is in point contact with a sample of a pressure digital display accessory, and when the sample is slightly abraded to cause position change, the spring dynamically compensates pressure loss to ensure that force loading in the x-axis direction is constant. An optical fiber is integrated in the round-bottom quartz tube to synchronously collect mechanoluminescence signals. The device solves the problem of force attenuation in the existing cycle test, and is beneficial to systematic research on the cycle characteristics of the mechanoluminescent material.

The application provides a kind of based on multiple range adaptive switching pressure reducing valve transient response data acquisition method and system, it is related to fluid control technical field, the method includes: step 1, obtains the preset test working condition parameter of pressure reducing valve, based on the pressure threshold value and flow interval in preset test working condition parameter, from multiple parallel test channel adaptive matching and switch to target range branch, construct initial fluid conduction loop;The centroid position, moment of inertia, polar moment of inertia and bending center of the fluid passage section of target range branch are executed analytical calculation, obtain section geometric characteristic parameter;Step 2, based on section geometric characteristic parameter and the flow cross section characteristics of initial fluid conduction loop, establish reference pressure field with stable negative pressure gradient on the outlet side of pressure reducing valve, and real-time monitoring steady state convergence state of reference pressure field.The application realizes the standardized collection of pressure reducing valve in positive pressure-negative pressure full working condition, high-low flow range under transient response.

The application discloses a positioning system error testing method, and belongs to the technical field of positioning. The method comprises the following steps: determining the coordinate systems of a measured system and a positioning reference system, and the positions of a test target point and a measured target point on a carrier; controlling linear motion of the carrier, and calculating a deflection angle between the two coordinate systems through a plurality of coordinate points of the test target point and the measured target point on a track of the linear motion; controlling rotation and linear motion of the carrier, acquiring a plurality of coordinate points of the test target point and the measured target point on a linear motion track after each rotation before the rotation, and an included angle between a longitudinal axis of the carrier and a coordinate axis of the measured system; and calculating errors of the measured system at each measurement point based on a preset relationship between positioning errors and distances between the two target points. The application has low requirements on the test target point and the measured target point in the testing process, can simplify coordinate system conversion calculation, and improves the accuracy of a positioning precision test result.

The utility model discloses a burning test fixture for a PCB (Printed Circuit Board), which comprises a test platform, a control circuit board, a test probe and a display screen, and is characterized in that the test platform is used for fixing the PCB to be tested; the control circuit board is installed in the test platform. The test probe is electrically connected with the control circuit board and is used for being in contact with a test point of the PCB; the display screen is installed on the test platform, is electrically connected with the control circuit board, and is used for displaying test data. Direct display of test data is realized through the integrated display screen, and an external computer terminal is not needed; a user can check a test result in real time, data transmission and display through external equipment are not needed, and the test intuition and response speed are remarkably improved; and the fixture can be more conveniently applied to workshops, laboratories or mobile test scenes without depending on an external computer terminal, so that the adaptability is higher.

The utility model discloses a kind of high-precision plug-in durability test equipment, belong to quick coupling detection technical field, including test box, the inside fixed connection of test box has workstation, the top fixed connection of workstation has the bottom plate of upper and lower parallel distribution, and fixedly connected with precision guide rod between bottom plate;The utility model, the setting of precision guide rod ensures that the sliding direction of push plate is accurate, prevents push plate deviation and causes plug alignment deviation;Female plug and female plug base thread connection, male plug and male head base bolt fixing mode, both facilitate staff to dismantle replacement female plug and male plug at any time, adapt to the test demand of different model plug, improve equipment versatility;Driving unit drives push plate to complete plug-in action automatically, replace manual operation, not only improve test efficiency, also avoid the error of manual operation, ensure the consistency of test result.

A rotor engine comprehensive bench test system and test method belong to the technical field of engine test. The system contains rotor engine, AC power dynamometer, main control unit and other groups of modules. The dynamometer can realize forward and reverse reversible rotation of the engine. The main control unit is provided with forward and reverse switching and three-stage alarm module. Each component is connected and communicated. Sensors, acquisition modules, analyzers and the main control unit are cooperatively networked. The test method sequentially completes bench building, system inspection, pre-starting verification, lubrication establishment, engine starting, top dead center searching, mechanical loss test, warming, full-range boundary monitoring, hot-state running-in, ECU online calibration and data evaluation. The combustion analyzer can calculate cylinder pressure parameters. ECU modified parameters take effect immediately. Data analysis covers power and economic indicators. The present invention solves the problem that existing benches cannot adapt to rotor engine tests, builds a safe and efficient comprehensive test platform and provides technical support for rotor engine research and development.

The present disclosure relates to the technical field of thin film material performance detection, and provides a method and system for testing complex permittivity of epitaxial thin film material in a terahertz frequency band, which comprises the following steps: performing transmission type testing on different transmission regions obtained by dividing a to-be-tested epitaxial thin film material sample and air, to obtain a time-domain waveform of a terahertz pulse transmission electric field; performing Fourier transform on the obtained time-domain waveform to obtain an amplitude spectrum and a phase spectrum of the electric field; calculating a complex refractive index of a substrate material according to the amplitude spectrum and the phase spectrum; constructing a transmission and reflection model for the substrate plus the epitaxial thin film material by taking into account multiple reflections inside the substrate material; obtaining a relationship between the complex permittivity of the epitaxial thin film material and the complex refractive index of the substrate material based on the transmission and reflection model, and inversely calculating the complex permittivity of the epitaxial thin film material. In the process of testing the complex permittivity of the epitaxial thin film material, the testing error introduced by multiple reflections inside the substrate material is taken into account, thereby improving the testing accuracy of the complex permittivity of the material.

This utility model discloses a warehouse vehicle wiring harness torsion testing device, characterized in that it includes a frame and at least one rotary mechanism assembly mounted on the frame, and a control unit for controlling the rotary mechanism assembly; the rotary mechanism assembly includes a rotary plate rotatably connected to the frame, and a rotary drive component for driving the rotary plate to rotate relative to the frame is provided between the rotary plate and the frame; a telescopic component is connected to the lower end of the rotary plate, and a handle connecting seat is provided at the lower end of the telescopic component. This application, by setting a rotary mechanism and a control unit for wiring harness torsion testing, drives the forklift handle to rotate through the rotary structure. The rotary structure of this application can not only drive the handle to rotate horizontally, but also to rotate vertically, which is closer to the actual working conditions, improves the accuracy of the test, and can detect the status of the forklift wiring harness in real time during the test, so as to accurately obtain the node where the forklift wiring harness has a fault.

The conductive light shield for a probe station of the present invention for cable connection pin clips includes a conductive shield body and a light-absorbing layer. The conductive shield body covers the outside of the pin clip on the probe station. The conductive shield body includes a top wall and side walls extending downwards from the edge of the top wall, with one end of the side wall away from the top wall contacting the probe station. The conductive shield body provides electrostatic shielding and optical protection, ensuring that the pin clip is protected from electrostatic discharge and stray light interference during testing, thereby improving testing accuracy and stability. Cable openings are provided on the side walls to accommodate the cable layout between the pin clip and the testing machine, ensuring that the cable can pass smoothly and maintain a normal connection with the testing system. The light-absorbing layer is disposed on the surface of the conductive shield body. The organic carbon black coating has good light absorption properties and can effectively absorb stray light from the environment, reducing interference from light reflection on the optical alignment system.

This invention discloses a continuous conductivity testing bench for lubricating grease and its testing method. The test bench includes a grease pump, a conductive base plate, a heating module, and an upper conductive plate. It can continuously measure the dynamic conductivity of the lubricating grease before and after breakdown and before and after blockage at a preset temperature, calculate the average conductivity during the continuous thickness change process, and conclude that the grease thickness is different when breakdown and blockage occur. It obtains the accurate values ​​of the grease thickness in the test area corresponding to each breakdown and blockage. In the blockage analysis, the volume of the grease to be injected into the test area is calculated by integration. Based on the instantaneous volume flow rate detected by the elliptical gear flow meter, the actual volume of the grease to be injected into the test area is calculated, and the flow rate of the grease pump is adjusted to ensure that the difference between the volume of the grease to be injected into the test area and the actual volume of the grease injected into the test area is within a preset range. This avoids the pressure changes caused by insufficient grease thickness or excessive grease affecting the test accuracy.

The application discloses a vibration durability simulation test tool for installation forming fasteners and a test method, relates to the technical field of durability performance detection of fasteners, and the tool comprises a vibration support table, a sample mounting plate and a pressing plate. The tool is accurately designed to simulate the stress state and the use environment of the fasteners under actual installation working conditions, and a standardized test procedure is adopted to test and compare the vibration durability performances of various installation forming fasteners under simulated complex service environments, especially under the multi-load coupling working conditions in large equipment. The scheme can realize high-fidelity simulation of the performance of the fasteners under real working conditions, and provides a scientific basis for product reliability evaluation and improvement.

This application relates to the field of HVAC and building energy conservation technology, and discloses a method and system for testing air conditioning equipment. One specific implementation of the method includes: receiving target conditions for testing the air conditioning equipment; performing semantic path reasoning using a pre-established association model to determine a target load mode and target test dataset matching the target conditions, and generating a test script; executing the test script to drive the air conditioning equipment to operate under the target load mode, and collecting operating data of the air conditioning equipment during operation; and using the operating data to determine and output evaluation indicators for the air conditioning equipment, wherein the evaluation indicators reflect the air conditioning performance and operating energy efficiency. This implementation can generate dynamic test conditions that conform to the characteristics of real building use without relying on traditional static experimental conditions, improving test accuracy, efficiently completing the evaluation of air conditioning equipment performance and operating energy efficiency, and providing a reliable basis for the optimized control of air conditioning equipment.

The application discloses a spring reliability evaluation method, and belongs to the technical field of spring testing. The method comprises the following steps: obtaining initial elastic force of a to-be-tested spring compressed to a working length; pretreating the to-be-tested spring; performing an acceleration experiment on the pretreated to-be-tested spring for a preset time length, and obtaining spring elastic force after the acceleration experiment; combining the initial elastic force and the spring elastic force after the acceleration experiment, and establishing a performance degradation model of the to-be-tested spring in which the elastic force changes with time; establishing a relationship formula of spring relaxation rate and temperature stress including multiple model parameters; estimating the relationship formula of the spring relaxation rate and the temperature stress, and obtaining model parameter estimation values; establishing a spring elastic force degradation model including test errors; determining a likelihood function of the spring elastic force degradation model including the test errors; calculating a maximum likelihood estimation value of the likelihood function; and calculating reliability of the to-be-tested spring according to the maximum likelihood estimation value and the performance degradation model, and combining a Monte Carlo simulation method.

The invention discloses a control method of a test system and the test system, and relates to the technical field of electrothermal alloy wires, and the method comprises the steps: starting a first heating mode of a power module in response to a test start instruction, so as to enable the electrothermal alloy wire to be electrified and heated; the first real-time temperature of the electric heating alloy wire is collected; responding to the condition that the first real-time temperature is equal to the preset target temperature, controlling the power supply module to be switched to a second heating mode; acquiring a second real-time temperature of the electrothermal alloy wire, and determining a real-time difference value between the second real-time temperature and the target temperature; in response to the fact that the real-time difference value is larger than a preset temperature threshold value, the output current of the power module is adjusted through a current control unit until the third real-time temperature of the electric heating alloy wire is equal to the target temperature; if the electric heating alloy wire is detected to be fused, the power module is controlled to be powered off, and the test is finished; and storing test parameters in the test process, and generating a test result of the electrothermal alloy wire based on the test parameters. The control method can effectively improve the test efficiency and the test precision.

The application aims to provide a dielectric property testing system and method of a wave-transparent material under high temperature and high pressure, and belongs to the technical field of microwave and millimeter wave dielectric material testing. The system innovatively adds a temperature device for heating and a pressure device for pressurizing in a conventional quasi-optical cavity method testing device, and sets a fused quartz considering the influence of temperature and pressure on the optical cavity, so that the system can test the dielectric property of the wave-transparent material under high temperature and high pressure by using the quasi-optical cavity method. Meanwhile, the system is simple to operate and has high testing precision.

The utility model discloses an airplane wheel rotation driving device, which belongs to the technical field of rotation driving devices, and comprises a rotation driving equipment table and a friction wheel, the friction wheel is arranged on one side of the rotation driving equipment table, a turnover adjusting mechanism is arranged between the rotation driving equipment table and the friction wheel, and the turnover adjusting mechanism comprises a turnover angle adjusting frame, a rotating shaft and an adjusting assembly. The rotating shaft is rotationally connected to the interior of the belt rotating equipment table, and the overturning angle adjusting frames are fixed to the two ends of the rotating shaft; according to the utility model, through the arrangement of the overturning adjusting mechanism, the lifting toothed plate is driven by the lifting air cylinder to be in meshing transmission with the driven gear, so that the friction wheel is automatically overturned and moved out, reset and stored, the use state and the idle state are freely switched, the operation is simple, convenient and efficient, and the friction wheel can be completely stored in the accommodating groove of the belt rotating equipment table when being idle; the device is flush with the surface of the equipment table, so that the occupied space is greatly reduced, avoiding space is provided for airplane wheel falling, interference to airplane traction and other testing operations is avoided, and the smooth testing process is guaranteed.

The utility model relates to the technical field of shoe sole wear resistance testing, in particular to a clamp damage prevention structure of a shoe sole wear resistance machine, which comprises a base, two sides of the top of the base are provided with clamping parts for clamping two sides of a shoe sole, the middle of the top of the base is provided with a supporting part for supporting the shoe sole, and the upper ends of the clamping parts are provided with clamping heads. A driving part is installed in the base close to the lower end of the clamping part, and the middle of the clamping part is rotationally connected with the base through a pin shaft. According to the clamp damage prevention structure of the shoe sole wear-resisting machine, the clamping components on the two sides of the top of the base are matched with the supporting component in the middle, and a shoe sole can be fixed in multiple directions. The driving component drives the lower end of the clamping component to move, the clamping head tightly presses the side face of a shoe sole according to the lever principle, the supporting height can be flexibly adjusted by combining the jacking component at the bottom of the supporting component, and accurate and stable fixing can be achieved for conventional shoe soles or shoe soles of irregular shapes and different sizes.

This utility model discloses a vibration test bench for radiators, including a fixed platform, a first vibration table, and a second vibration table. The first vibration table is mounted on the fixed platform in a left-right sliding manner. A first reciprocating mechanism is installed on the left or right side of the fixed platform, and the main shaft of the first reciprocating mechanism is correspondingly fixed on the first vibration table. The first reciprocating mechanism drives the first vibration table to vibrate left and right. This device can realize both left-right reciprocating vibration tests and front-back reciprocating vibration tests of radiators. Through the combination design of various components, bidirectional vibration testing of radiators can be achieved, improving the accuracy of the test. The structure is ingeniously and reasonably designed, and it is easy to use.

The invention relates to a regression test method and system for position information release and electronic equipment, and the method comprises the steps: obtaining a plurality of groups of test case data suitable for a target position based on a preset test case data set, the test case data comprising legal user identity data, test data and expected data; performing simulation release of target position information based on the test data of each test case; release response data of multiple dimensions are obtained, and verification is carried out based on the expected data of each test case in each dimension and the release response data; and recording data generated during simulation release of the target position information, release response data of multiple dimensions and verification data, and generating a regression test report for release of the target position information based on the recorded data. According to the invention, the test efficiency is improved, the manual labor amount is reduced, the test accuracy is high, the coverage is wide, and the expandability is high.

The application discloses a fan control circuit and an air conditioner. The fan control circuit is connected with a fan. The fan control circuit comprises a control module, a sampling module and a detection module. The control module outputs a fan current to control the start of the fan when the fan starts. The sampling module samples and amplifies the fan current to output an amplified signal. The detection module is used for outputting a first detection signal when the voltage of the amplified signal is less than or equal to a first threshold value, outputting a second detection signal when the voltage of the amplified signal is greater than the first threshold value and less than a second threshold value, and outputting a third detection signal when the voltage of the amplified signal is greater than or equal to the second threshold value. The control module further adjusts the fan current according to the first detection signal, the second detection signal or the third detection signal, can meet the start of the fan in different working modes, improves the test accuracy of the fan, and reduces the damage rate of the fan.