300results about How to "Improve test stability" patented technology

The present invention discloses an earphone testing device. An earphone testing device provided by the embodiments of the present invention comprises an fixation base, a standard microphone attached to the fixation base, and a fixation scaffold for attaching and fixing the fixation base and the standard microphone; the fixation base is supported and fixed on the fixation scaffold by several supporting elements; a sealer is located on the position on the fixation base in contact with the outer shell of an earphone, the sealer forms an earphone storage portion for placing the earphone; a sealer is located on the position on the fixation base in contact with the outer shell of the standard microphone, the sealer forms a microphone attachment portion for attaching to the standard microphone; the earphone placed in the earphone storage portion and the standard microphone attached onto the microphone attachment portion are communicated with each other in the fixation base. The present invention provides a stable and highly precise testing solution of earphone, which can guarantee the precision and stability of earphone testing.

The invention belongs to the technical field of 3G mobile phones, in particular to a test method for mobile phone antenna radiation performances, which comprises firstly testing the total radiation power of a mobile phone, calculating the gain of a mobile phone antenna according to the total radiation power, setting the gain value of the mobile phone antenna as the loss value of up link and down link of a terminal all-purpose tester, setting a reference power value as a critical reference power value of the omnidirectional sensitivity measurement, wherein the set reference power value will be extremely close to the critical reference power value therefore, thereby guaranteeing the chain path in the test process connecting. The test method can be used to find the reference power value meeting the requirement only by testing twice, simultaneously, and can test the total radiation power of the mobile phone antenna, thereby increasing the test efficiency and the test stability.

The invention provides a loudspeaker diaphragm tester with a controlled excitation source. The tester comprises a to-be-tested platform, the controlled excitation source, a laser displacement sensor and a control device. To-be-tested diaphragm is fixed on the to-be-tested platform. The laser displacement sensor is fixed on the to-be-tested platform. To-be-tested diaphragm and the laser displacement sensor are coaxially arranged on the to-be-tested platform. The control device inputs a control signal into the controlled excitation source. The controlled excitation source generates an excitation signal according to the control signal. The to-be-tested diaphragm is excited by an excitation signal generated by the controlled excitation source to generate vibration. The laser displacement sensor detects vibration information when the diaphragm vibrates. According to the tester, the to-be-tested diaphragm can be excited by the controlled excitation source to vibrate well; physical parameters of the diaphragm are obtained through various channels such as measuring air pressure and diaphragm displacement; and the tester has relatively high test precision and relatively high stability.

The invention discloses a test device, in particular to a connector product test device which is high in test accuracy, reduces test cost and improves test efficiency. According to the connector product test device, a test pin is adopted to replace the test connector in the prior art for product testing, is arranged on a movable carrier and is electrically connected with a test terminal. During testing, the carrier moves by aid of manual operation or through a power device and drives the test pin to move in the direction of a connector to be tested, and finally the tail end of the test pin is contacted with a metal sheet of the connector to be tested to achieve testing. The connector product test device is widely applied to the connector test field.

The invention discloses an insulation aging evaluation method for a 110kV XLPE high-voltage cable. The method comprises the following steps: testing polarization current and depolarization current ofthe high-voltage cable in a polarization process and a depolarization process through polarization-depolarization current (PDC); obtaining a low-frequency dielectric loss factor under the corresponding polarization voltage according to the obtained polarization current and depolarization current; and evaluating the insulation performance of the high-voltage cable by taking variation of the low-frequency dielectric loss factor under different polarization voltages as a characteristic quantity for representing the insulation aging of the cable. Thus, the insulation aging state of the high-voltage cable can be diagnosed efficiently, and reflected more accurately, the sensitivity is high, and the method can be widely applied in the field of cable insulation aging diagnosis in future.

The invention discloses a PCB (Printed Circuit Board) compacting fixture, which comprises a connecting plate, a bracket and an air cylinder and is characterized by further comprising a sleeve, a pressing plate and pressing pads, wherein the connecting plate is transversely connected to the top of the bracket, the air cylinder is arranged at the bottom of the connecting plate, the sleeve is connected to the bottom of an air cylinder rod of the air cylinder, a spring is arranged in the sleeve, the bottom of the spring is connected with the central position of the top of the pressing plate, and a plurality of pressing pads are arranged at the bottom of the pressing plate. The PCB compacting fixture disclosed by the invention solves the problem that the testing precision is greatly influenced because the PCB needs to be compacted without moving when data, such as voltage and current of the PCB are tested, but the traditional compacting fixture is very complicated and not favorable to PCB testing in the prior art; and the PCB compacting fixture provided by the invention has the advantages of simple structure, convenience for use and capability of rapidly and accurately compacting the PCB.

The invention belongs to the technical field of machining of a PCB (Printed Circuit Board), and relates to a method for monitoring pressure of a test probe. The method comprises the following steps: detecting an initial position of the test probe and acquiring a detection signal initial value corresponding to the initial position; feeding the test probe; detecting current displacement of the test probe, acquiring a detection signal dynamic value of the pressure corresponding to the current displacement, and controlling the test probe to stop feeding when the detection signal dynamic value is equal to a detection signal threshold value corresponding to preset pressure. The invention also relates to a device for monitoring the pressure of the test probe. The device comprises a probe sensor, a sensor work and analog voltage output circuit, an analog-digital conversion module, a data processing module and a control module. According to the method and the device, the pressure of the test probe is automatically monitored and accurately adjusted, the impact and the noise during feeding of the test probe are reduced, an obvious pricking trace at the PCB testing point is avoided, the recognition of a probe lifting position is realized, the waiting time of positioning movement is reduced, the testing efficiency is improved, and the testing misjudgment rate is reduced.

The invention discloses a manufacturing technology of a glass fiber / epoxy resin composite material substrate type fiber bragg grating sensor. The manufacturing technology comprises the steps that glass fiber / epoxy resin prepreg is procured to prepare a glass fiber / epoxy resin composite material substrate; a fiber bragg grating is fixed to the glass fiber / epoxy resin composite material substrate; the glass fiber / epoxy resin composite material substrate fixed with the fiber bragg grating is covered with a dry-state glass fiber cloth, vacuum aided filling of liquid epoxy resin is performed, and secondary curing molding is performed. The manufacturing technology adopts the secondary curing molding in the packaging process, the interlayer interface strength is remarkably improved, accordingly the testing precision and stability of the fiber bragg grating sensor are improved, batch production of the fiber bragg grating sensor can be achieved, and the manufacturing technology has wide market prospect and huge economic benefit.

The invention provides a high-frequency vertical spring probe card structure including a plurality of probes. Each of the probes includes at least one conducting layer and at least one insulating layer. The conducting layer includes a first contact end and a second contact end used for electrically contacting an external component while the probe is compressed and includes a probe body including at least one plate portion and at least one resilient portion connected to each other. The plate portion is used for supporting deformation of the resilient portion while the resilient portion is compressed vertically. The insulating layer includes at least one plate member tightly attached to the plate portion of the conducting layer correspondingly. The probe structure of the invention is simple and can be formed as multi-layer stack structure by electroplating through Lithographie GaVanoformung Abformung (LIGA) technology.

The invention discloses an asphalt pavement load temperature coupling testing device and testing method thereof. The method comprises the following steps: uniformly heating a test piece to be tested by adopting a heating plate, applying pressure to the test piece to be tested through a hydraulic cylinder, and controlling an air inlet fan, an exhaust fan and the heating plate through a computer, so that the temperature is in sine curve change during test; and recording the stress change of each point inside the test piece to be tested under load and temperature changes though a stress sensor embedded inside the test piece to be tested. The experiment is carried out through step-related experimental conditions, the experimental result is compared to determine a coupling effect of the asphalt pavement load temperature, the experimental device is reasonable in structure, high in testing accuracy and high in testing stability, and the test method is clear in steps, simple in operation and high in degree of automation.

The invention discloses an automated testing method and device, computer equipment and a storage medium, and the method comprises the steps: obtaining the first address information of a code management warehouse when an automated testing request is received; according to the first address information, obtaining a specified code corresponding to the automatic test request from a code management warehouse through a code management tool in a preset container cloud platform; generating an automatic test script corresponding to the specified code according to the specified code; pulling a preset Docker mirror image from the mirror image warehouse, and deploying the Docker mirror image in the container cloud platform; copying the automatic test script into a Docker mirror image in the containercloud platform to generate a corresponding pod; and executing the automated test script in the pod. According to the invention, the pod for automatic testing is generated by using the container technology and the mirror image technology, so that the reusability and maintainability of the testing operation environment of the automatic testing are effectively ensured, and the testing efficiency andthe testing stability of the automatic testing are improved.

The present invention discloses an RV speed reducer transmission return difference testing device which is formed by a base, a loading device, a measuring device and a locking device. The loading device is formed by a servo motor, a motor bracket and a motor-side coupler. The measuring device is formed by a torque rotation speed sensor, an input end coupler, an encoder, an input end flange, a coupler support seat, and a sensor support seat. The locking device is formed by a locking pin, an output end locking flange and a speed reducer support seat. Compared the a previous RV speed reducer transmission return difference testing method, the device has the advantages that the testing of static and dynamic return differences can be carried out, the efficiency is higher than that of the traditional return difference testing method, a program-controlled loading mode is employed, and the degree of automation is high. The device has the advantages of a simple structure, high testing precision, a low testing environment requirement, and a high degree of automation, and the high precision performance testing and detection requirements of an RV speed reducer by an industrial robot can be satisfied.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a three-electrode lithium ion battery. The three-electrode lithium ion battery comprises a battery shell, a bare battery cell and a lithium titanate pole piece, wherein the bare battery cell and the lithium titanate pole piece are packaged in the battery shell, the bare battery cell is provided witha positive electrode tab and a negative electrode tab which are led out of the battery shell, and the lithium titanate pole piece is provided with a reference electrode tab which is led out of the battery shell. Compared with the prior art, the problem that the interface structure of the battery cell is easy to damage is solved, and the test accuracy and stability are greatly improved. Besides, the invention further provides a preparation method of the three-electrode lithium ion battery, which is easy to operate and solves the problem of high difficulty in the manufacturing process of the existing three-electrode lithium ion battery.

The invention discloses a rapid detection method and a device for ferrous oxide in sintered ores. The detection method comprises the following steps: subjecting a sample to a pre-treatment, establishing a standard curve between the sintered ore magnetic conductivity and the corresponding ferrous oxide content in the sintered ore, and finally substituting the measured sample magnetic conductivity into the standard curve between the sintered ore magnetic conductivity and the ferrous oxide content to calculate the concentration of ferrous oxide in the sinter ore sample. The device comprises a detection signal generating unit, the upper end of the iron core of the transformer of the detection signal generating unit is provided with a magnetic circuit disconnecting gap, the magnetic circuit disconnecting gap is provided with a sample measuring cavity, which is used to place an sintered ore sample and make the sample contact and connect to the iron core; a signal collecting unit is used to convert the collected voltage signals into magnetic conductivity signals and then transmits the magnetic conductivity signals to a signal processing unit, the signal processing unit is used to substitute the magnetic conductivity into the standard curve to calculate the ferrous oxide concentration of the sample, and the device has the advantages of low detection cost, rapid analysis speed, and accurate detection result.

The invention relates to a measuring system of automatic light change goggles response time, in particular to a measuring system of automatic light change goggles response time making use of laser, modulated infrared light, electronic technology and computer technology. The invention consisting of a testing light source, a triggering unit, a signal reception / pretreatment unit, a digital signal treatment / control unit and a power module is characterized in that: the bright and dim status conversion of the liquid crystal screen of the goggles to be measured is controlled by the infrared triggering light source through a computer, the variation of the transparency degree of the goggles is also detected simultaneously, and thus the response time or turn-off and recovery time of the goggles can be worked out. The invention has the advantages of simple structure, portability, energy conservation and consumption reduction, as well as convenient use. The invention which adopts a Europe standard of BS EN379-2003 is applicable to testing the response time of the automatic light change goggles capable of protecting eyes against radiation in electric welding, gas welding and arc light surroundings.

The invention relates to a preparation method of a chitosan 6-OH immobilized cyclodextrin derivative, and an application thereof in a H2O2 detection fluorescent biosensor. The invention belongs to the field of high-molecular material preparation and modification. According to the invention, chitosan 2-NH2 is protected by using phthalic anhydride; through a click chemical reaction, cyclodextrin is immobilized at a 6-OH position; and the protection of chitosan 2-NH2 is removed by using hydrazine hydrate, such that the chitosan 6-OH immobilized cyclodextrin derivative with good solubility in water and part of organic solvents and with high immobilization rate is prepared. Fluorescent probe is immobilized in cyclodextrin hydrophobic hollow cavities of the chitosan 6-OH immobilized cyclodextrin derivative provided by the invention, 2-NH2 of chitosan pyranose ring is used for immobilizing catalase, and the material is used in a fluorescent biosensor used for detecting H2O2 content. The invention assists in realizing the application of chitosan 6-OH immobilized cyclodextrin derivative in the fluorescent biosensor in which enzyme catalysis is combined with fluorescence detection.

The invention relates to a steel plate beam bridge face outer deformation full size fatigue test loading device. A test beam is provided with a steel cushion plate, a loading beam and a servo hydraulic actuator. A test beam web is provided with vertical stiffening ribs, the adjusting ends of diagonal bars are arranged on the vertical stiffening ribs, and the supporting ends of the diagonal bars are arranged on anchoring blocks. The bottom of the test beam is provided with connecting structural steel, and the two ends of the test beam are provided with auxiliary beams. The joints of the auxiliary beams and the test beam are provided with horizontal stiffening ribs, connecting plates are arranged between the auxiliary beams and the test beam, the bottom of the front auxiliary beam and the bottom of the rear auxiliary beam are provided with a front auxiliary beam segment supporting structure and a rear auxiliary beam segment supporting structure respectively, and the front auxiliary beam and the rear auxiliary beam are fixed to troughs respectively. The test beam, the loading beam, the auxiliary beams and the connecting structures of the test beam, the loading beam and the auxiliary beams form a right beam segment. The left ends of the front auxiliary beam segment supporting structure, the rear auxiliary beam segment supporting structure and the connecting structural steel are provided with left beam segments which have the same structure and the opposite direction with the right beam segment, and the left beam segments are parallel to the right beam segment. Loading point stiffening ribs are arranged on the two sides of the vertical stiffening ribs of the test beam web, horizontal joint plates are arranged between the lower ends of the vertical stiffening ribs on the inner side and the test beam web, and a left beam segment horizontal joint plate is connected with a right beam segment horizontal joint plate in parallel.

The invention discloses a micro-current measuring circuit for dielectric response tests; the micro-current measuring circuit comprises a logarithm operation unit, a linear optical coupler unit, an index operation unit, and a signal secondary amplification unit connected in sequence; the logarithm operation unit comprises an ultra low bias current amplifier and a negative feedback element; the linear optical coupler unit comprises a linear optical coupler chip and a negative feedback circuit; the index operation unit comprises a high speed operation amplifier and a photosensitive diode; the micro-current measuring circuit has no feedback resistor, so the measuring result cannot be affected by a resistance temperature coefficient, thus providing high temperature drift influence inhibition ability, and the temperature coefficient can reach 100ppm / C.

The invention discloses a radio frequency test device and a mobile terminal test system. The radio frequency test device comprises an integrated tester and an interference signal generator, and further comprises a first isolator and a combiner, wherein the integrated tester comprises an emitting port and a receiving port which are separated; the emitting port is connected with the input port of the first isolator; the output port of the first isolator is connected with one input port of the combiner; the interference signal generator is connected with other input ports of the combiner; a radio frequency emission signal emitted by the integrated tester or a radio frequency signal emitted by the integrated tester and the interference signal generator are output by the output port of the combiner; and the radio frequency signal received by the radio frequency test device accesses to the integrated tester via the receiving port. According to the radio frequency test device provided by the invention, the emitting report and the receiving port are separated, and the isolator is used to isolate the signals, thereby effectively avoiding mutual interference of the signals, improving the test stability and the test accuracy of the test device.

The invention discloses a testing method for the performance of a photocatalytic air-purifying material. The testing method comprises the following steps: preparing a sample piece of the photocatalytic air-purifying material and placing the prepared sample piece in an enclosed reaction chamber; irradiating the sample piece with a light source so as to realize pretreatment of the sample piece; introducing a target pollutant with a fixed concentration into the reaction chamber by using a partial pressure method and carrying out dark adsorption on the sample piece; and carrying out a photocatalytic degradation reaction and detecting concentration changes of the target pollutant, a degradation intermediate and a final degradation product, i.e., carbon dioxide, by using a gas chromatographic-mass spectrometric instrument. The testing method is rapid and highly efficient, has accurate and reliable testing results and high testing stability, can simultaneously characterize the adsorption performance and photocatalysis performance of the photocatalytic air-purifying material and the photocatalysis performance of material from the two aspects consisting of the concentration change of the target pollutant and the concentration change of the degradation intermediate, and is beneficial for objective and accurate characterization of the performance of the photocatalytic air-purifying material; thus, the method can promote extensive application of the photocatalytic air-purifying material.

The invention discloses a sensor linear correction method and device. The method comprises the steps of adopting a sensor to measure at least two standard measured objects to obtain corresponding correction measurement data; building a corresponding relation between actual data and the correction measurement data of all standard measured objects, and using two adjacent correction measurement data as a correction interval; measuring an object to be measured through the sensor to obtain corresponding real-time measurement data, and determining the correction interval into which the real-time measurement data falls; according to a linear relation of the correction measurement data which falls into the correction interval and the actual data corresponding to the correction measurement data and by combining the real-time measurement data, calculating the actual data of the object to be measured. In the sensor linear correction method and device, according to linear characteristics of the sensor itself, a multi-section type correction method is designed, the precision of the sensor in the correction process is drastically improved, and the testing precision and stability of a measurement system are improved.

The invention discloses a precise instrument vibration isolation platform. The precise instrument vibration isolation platform comprises a load platform module, a vibration isolation system module anda mobile support module. Three modules of the vibration isolation device are distributed from top to bottom, and a vibration isolation system module (composed of three vibration isolator assemblies)is located in the middle and connected with the load platform module and the mobile support module up and down. The designed vibration isolation system module is of a closed multi-group parallel structure, and has the characteristics of high bearing capacity, good stability and the like; meanwhile, a three-point six-spring oblique convergence type supporting design is adopted for the vibration isolator assemblies, the three-direction equal-rigidity and equal-fundamental-frequency functions under a space coordinate system are achieved, and good vibration reduction and isolation performance is achieved; besides, vibration isolation devices are provided with limiting locking assemblies in parallel, the limiting protection effect on a precise measuring instrument can be achieved, and good safety is achieved. The vibration isolation device integrally adopts a travelling crane integrated design, is movable, lockable, convenient to use and fast, and has very strong environmental adaptability.The whole structure is simple, the manufacturing cost is low and the application prospect is wide.

The invention discloses a device obtaining direct current signals from alternative current and direct current overlapped signals. The device obtaining the direct current signals from the alternative current and direct current overlapped signals comprises a controller which sends out control commands according to time sequence, a whole cycle sampling switch connected with the controller and being switched on and off according to the control commands outputted by the controller, an integral circuit connected with an output end of the whole cycle sampling switch, a sampling maintain switch, a sampling holder connected with the other end of the sampling maintain switch, wherein an integral capacitance on the integral circuit conducts integral sampling of inputted overlapped signals, and one end of the sampling maintain switch is connected with the output end of the integral circuit. After sampling of the integral circuit is finished, under the control of the controller, the whole cycle sampling switch is disconnected, the sampling maintain switch is closed, voltage of the integral capacitance is transferred to the sampling holder to be kept. The device obtaining the direct current signals from the alternative current and the direct current overlapped signals can eliminate power line interference of the overlapped signals, ensure test of the instrument not to be influenced by alternative current signals, and improve test speed.

The invention discloses a parallel test system of the wafer multiple test objects, which comprises a probe group of the multiple test objects that the parallel test requires, and the additional probes corresponding to the close chip of the test objects. The additional probes correspond to the ground terminal or other terminals of the close chip of the test objects, and contact with them when under test. The invention effectively solves the problem of crosstalk due to the leakage of charge pattern of the ground potential in the process of parallel test.

The invention discloses a high-precision extinction ratio test method and system. The method includes the steps that when light signals are attenuated to be within a best work signal-to-noise ratio range of a light signal modulation amplitude test unit, and a part of the attenuated light signals are tested through the light signal modulation amplitude test unit to obtain a light signal modulation amplitude value; the extinction ratio is calculated according to the light signal modulation amplitude value. A method based on high-speed radio frequency signal peak-to-peak value detection is adopted, the extinction ratio of the detected light signals is converted into low-frequency voltage signals, and the aim of measuring the high-speed light signal extinction ratio at high precision is achieved on various signal code pattern and modulation format conditions in a wide signal speed range; meanwhile, the system greatly extends the dynamic range of the light signals capable of being tested, and testing precision, consistence of repeated tests and work stability of a test device are improved.

The invention discloses a JTAG link based circuit board test system and method. The system comprises a master controller, general instrument equipment, a JTAG link controller, a first JTAG link chip and a JTAG accompanied test tool; the master controller sends a test instruction to the general instrument equipment and the JTAG link controller, and the general instrument equipment and the JTAG linkcontroller generate an excitation signal according to the test instrument and send the excitation signal to a tested circuit board; the JTAG link controller can send the excitation signal to the tested circuit board via the first JTAG link chip directly so as to excite the circuit board to generate a response signal; or, the excitation signal is sent to the tested circuit board via the JTAG accompanied test tool indirectly, and the circuit board is excited to generate the response signal; the JTAG link controller compares the digital excitation signal with the digital response signal and sends a comparison result to the master controller; the general instrument equipment sends an analog response signal generated by the tested circuit board to the master controller; and the mater controller determine whether the tested circuit board is normal according to the comparison result, the test instruction and the analog response signal.

An embodiment of the present invention provides an automatic testing method and system, a computer device, and a computer-readable storage medium applied to the technical field of computers. The testing method method includes a step of acquiring a current test task which includes multiple test cases, a step of judging whether the execution sequence of the multiple test cases conforms to a dependency rule or not, a step of obtaining any test case of the multiple test cases if so, a step of obtaining a boundary value of the any test case, and a step of performing the operation sequence of the any test case based on the boundary value and marking operation command information of the operation sequence and execution result information of the operation sequence. When requirements are changed, atest script has the smallest scope of changes, the stability of a test can be improved, and the problems of a complicated system data environment and high running time cost can be solved.

A dry-phase triglycerides test strip that can be stored at room or elevated temperatures for several months without significant degradation in its effectiveness. The test strip includes a test membrane which receives plasma and forms a colored response in proportion to concentration of triglycerides in the plasma. The test membrane is impregnated with an aqueous solution containing lipoprotein lipase (LPL) and 4-aminoantipyrine (4AAP). The inventors have found that by reducing the pH of the impregnating solution to less than that of the recommended pH range for one of the key components (viz., less than pH 6.0), overall stability of the test strips was dramatically improved. The improvement in storage capability of these triglycerides test strips represents not just a difference in degree, but a difference in kind.