627 results about "Leakage test" patented technology

A method of measuring the transistor leakage current. In one embodiment, the method involves driving a ring oscillator with a dynamic node driver having a leakage test device biased to an off state to produce a test signal. The test signal is extracted and the frequency is measured. The leakage current is estimated from the measured frequency.

A circuit and method thereof for measuring leakage current are described. The circuit includes a pre-charge device subject to a first backbias voltage and a leakage test device subject to a second backbias voltage. The leakage test device is coupled to the pre-charge device. The leakage test device is biased to an off state. A differential amplifier is coupled to the pre-charge device and the leakage test device. A delay unit is coupled to the differential amplifier and to an input of the pre-charge device. The pre-charge device is turned on and off at a frequency that corresponds to said leakage current.

A receptacle device for protection against arc faults and leakage currents, including an arc fault test button, a leakage test button, and a reset button. Test resistors are arranged below the arc fault test button and the leakage test button wherein the test resistors are coupled to an electrical circuit board. The electrical circuit board includes an arc sampling resistor to detect arc faults and a leakage detection differential transformer to detect leakage currents. In order to provide good contacts between mobile and stationary electrical contacts of the receptacle device, a reset button bias member having mobile contact bridges at its two arms is provided. Each of the mobile contact bridges has three triangularly spaced electrical contacts, corresponding to stationary electrical contacts of flexible input fingers, output conductors and electrical output leads of the receptacle device. In order to balance the mobile contact bridges and provide better contacts, the receptacle device of the present invention can utilize a unique system of dual directional locks, i.e., below the reset button, there are two axially symmetrical directional locks provided within a reset button bias member of the receptacle device.

A leak detection system capable of automatically detecting a leak in a pressurized piping system. A pressure decay test is utilized to test for leaks in the piping system. Disruption to users of the piping system is reduced by only performing the pressure decay test when there is no user demand on the piping system. Thus, a leakage test is performed by first determining whether there is user demand on the piping system and proceeding with a pressure decay test only if there is no user demand present. If user demand is initiated during the performance of a pressure decay test, the system detects the user demand and halts the pressure decay test until the user demand stops.

A multi-function device for testing masks such as NBC masks used in civilian and military applications. In its preferred form, the device is self-contained and can be readily transported to field sites by one or two individuals. The device includes a protective storage and transport case. The case includes an upper portion and a lower portion. The upper portion of the case houses the power unit assembly and includes sufficient storage space to store such things as an aerosol generator reservoir, various headform accessories, a containment shroud, manuals (e.g. installation, operation and maintenance manuals) and nominal tools. The lower portion of the case houses the head assembly and controller unit which are preferably mounted on a cover or top panel. Underneath the top or cover panel of the lower portion of the case are stored the light scattering chamber, flow sensor, pressure transducer, circuit boards and valves. The device can perform multiple tests including (1) an overall mask leakage test; (2) an outlet valve leakage test; (3) a drink seat test; (4) a drink tube flow test; (5) a drink train leakage test; and, a mask fit test. Further, the device can be programmed for any given test period to perform one or all of the aforementioned tests. The device further can readily create a data log to record results of any given test or series of tests. The device further includes numerous safety features including requiring any operator of the device to reject or retest a defective mask.

The invention relates to a test sorting machine for a battery product and a sorting method for the test sorting machine. The test sorting machine comprises a feeding device, a short circuit test sorting device, a station turntable, a leakage test device, a leakage test sorting device, a weighing device, a weighing taking device and a weighing sorting device, wherein the leakage test device is arranged on a table-board of one side of a leakage test station; the short circuit test sorting device is arranged on a working table-board of one side of a short circuit test qualified product placement station; the feeding device and a short circuit placement region are arranged in front of the short circuit test sorting device; the leakage test sorting device is arranged on one side of a leakage test taking station; a leakage test unqualified product placement region and a leakage test qualified product conveying chute are formed on a working table-board of the front side of the leakage test sorting device; the weighing device is arranged at the outlet end of the leakage test qualified product conveying chute; the weighing taking device is arranged on the front side or the rear side of the weighing device; and the weighing sorting device is arranged on one side between the weighing device and a conveying device. The test sorting machine can perform multi-detection and sort batteries of different standards at the same time, so the working efficiency is high.

A test structure and method for determining DRAM cell leakage. The cell leakage test structure includes a pair of buried strap test structures. Each buried strap test structure includes multiple trench capacitors formed in a silicon body. Each trench capacitor is connected to a trench sidewall diffusion by at least one buried strap. An n-well ring surrounds each buried strap test structure and divides the buried strap test structure into two separate array p-wells, one being a contact area and the other a leakage test area. The contact area includes contacts to the trench capacitor plates for the corresponding buried strap test structure. In one buried strap test structure, a layer of polysilicon, essentially covers the trench capacitors in the leakage test area to block source / drain region formation there. The other of the two buried strap test structures includes polysilicon lines simulating wordlines with source and drain regions form on either side. A buried n-band contacts the n-well rings, essentially forming an isolation tub around each array well. Cell leakage is measured by measuring leakage current in each buried strap test structure, individually, and then extracting individual leakage components from the measured result.

The invention relates to a method for monitoring pressure pipe leakage acoustic emission in a nuclear power plant and a monitoring system thereof. The monitoring method adopts the technical scheme that a pressure pipe leakage test piece is prepared; the initiation, crack, expansion and through leakage of the pipeline of the nuclear power plant are imitated, a leakage acoustic emission calibration test is performed, and the through crack leakage of the pipeline under high temperature and high pressure environment in nuclear power plant is imitated. The monitoring system adopts a standardized and modularized design which is based on PXI bus and convenient for system maintenance and part replacement. Through adopting the monitoring method and the monitoring system, the data record of leakage event and the database management of monitoring result can be achieved; moreover, the leak position and the dynamic change of leak rate are completely reflected.

Regular data inputted / outputted to / from external terminals is read / written to / from a regular cell array, and parity data is read / written from / to a parity cell array. Since the parity data is generated by a parity generation circuit, it is difficult to write a desired pattern to the parity cell array. The regular data and the parity data are exchanged with each other by a switch circuit, so that the regular data can be written to the parity cell array and the parity data can be written to the regular cell array. This enables the write of desired data to the parity cell array. A test of the parity data can be easily conducted. In particular, a leakage test or the like between memory cells can be easily conducted.

The invention relates to a method for brazing a compact efficient titanium alloy plate-fin heat exchanger, which adopts an amorphous titanium based brazing filler metal brazing titanium alloy with lower melting point which is between 820 and 840 DEG C, wherein the optimum clearance of the amorphous titanium based brazing filler metal brazing titanium alloy is between 20 and 90 microns, the optimum brazing temperature is between 850 and 900 DEG C, the optimum brazing time is between 10 and 15 minutes, the heating rate before soaking a workpiece is between 10 and 15 DEG C per minute, the heating rate for brazing after the soaking is 15 DEG C per minute, the cooling rate for the brazing filler metal to become solid from liquid is not less than 15 DEG C per minute, and a vacuum system only can be closed when the temperature is below 150 DEG C. Through strict selection and purchase of materials, precise part machining, careful part cleaning, brazing filler metal arrangement according to a process, precise assembling and clamping, and performing brazing according to a stated brazing process, a helium gas leakage test shows that the integral leakage of the product is 9*10<-8>PaM<3> / S which is in accordance with the standard requirement.

A fail-safe circuit for a pair of differential input lines detects when one or both lines are open. Each line has a pull-up of a switched p-channel transistor in series with a resistor or another p-channel transistor that has its effective resistance controlled by a gate bias. The gate of the switched p-channel transistor is driven to ground when power is applied to the gate of a grounding n-channel transistor. When power is off, a p-channel connecting transistor charges the gate node from the differential input line when a positive voltage is applied to the input line, such as during a leakage test. Charging the gate node prevents the switched p-channel transistor from turning on, blocking a leakage current path through the pull-up. An N-well bias circuit can be added, which connects the N-well under p-channel transistors to power or the gate node or the input line.

A method of measuring the transistor leakage current. In one embodiment, the method involves driving a ring oscillator with a dynamic node driver having a leakage test device biased to an off state to produce a test signal. The test signal is extracted and the frequency is measured. The leakage current is estimated from the measured frequency.

This invention provides a leakage test method and a device including: marking a basic tendency of an underground line to be tested, injecting a tracer gas in a certain pressure composition of 5% hydrogen and 95% nitrogen to the line, testing the H2 signal along the tendency of the pipeline with a H2-sensitive probe of a movable hydrogen leak detector, converting the test signal to an electric signal then converting it to a digital signal by A / D conversion, memorizing and analyzing the continuously tested digital signals to judge the leakage orientation based on the change trend weak or strong of the test signal and judging the accurate position of the leak point by comparing with the maximum value of the memory and an indicator displays the maximum value of the concentration of the tested hydrogen and indicates the location of the direction and leakage definitely. Advantage: direct indication, accurate location to reduce work intensity of test.

System and method using low voltage current measurements to measure voltage network currents in an integrated circuit (IC). In one aspect, a low voltage current leakage test is applied voltage networks for the IC or microchip via one or more IC chip connectors. One or multiple specifications are developed based on chip's circuit delay wherein a chip is aborted or sorted into a lesser reliability sort depending whether the chip fails specification. Alternately, a low voltage current leakage test begins an integrated circuit test flow. Then there is run a high voltage stress, and a second low voltage current leakage test is thereafter added. Then, there is compared the second low voltage test to the first low V test, and if the measured current is less on second test, this is indicative of a defect present which may result in either a scrap or downgrade reliability of chip.

The invention discloses a leakage circuit breaker which has a simple and small structure of a test circuit and can simultaneously perform accurate leakage tests. As a power supply circuit for supplying power to the leakage detection circuit in the leakage circuit breaker, a power supply circuit with a constant current circuit that converts the AC current supplied from the main circuit into a DC current and supplies a constant DC current to the leakage detection circuit is used, and the test resistance The elements are arranged in series in the circuit connecting the main circuit and the AC input end of the current stabilizing circuit, and the test coil of the zero-phase converter is connected to both ends of the resistance element through a test switch to form a leakage test circuit.

A receptacle device for protection against arc faults and leakage currents, including an arc fault test button, a leakage test button, and a reset button. Test resistors are arranged below the arc fault test button and the leakage test button wherein the test resistors are coupled to an electrical circuit board. The electrical circuit board includes an arc sampling resistor to detect arc faults and a leakage detection differential transformer to detect leakage currents. In order to provide good contacts between mobile and stationary electrical contacts of the receptacle device, a reset button bias member having mobile contact bridges at its two arms is provided. Each of the mobile contact bridges has three triangularly spaced electrical contacts, corresponding to stationary electrical contacts of flexible input fingers, output conductors and electrical output leads of the receptacle device. In order to balance the mobile contact bridges and provide better contacts, the receptacle device of the present invention can utilize a unique system of dual directional locks, i.e., below the reset button, there are two axially symmetrical directional locks provided within a reset button bias member of the receptacle device.

The invention discloses a synchronous detection method of the terrane crack distribution of a base plate, comprising the following steps of: firstly, injecting water while drilling in the drilling process; secondly, drawing a water current leak-off velocity diagram for different positions in a drilling hole according to different drilling depths and corresponding water loss amount; and finally determining the fracture or crack development degrees of terranes with different depths. The invention realizes that the drilling and the water inject leakage test are synchronously carried out, ensuresthe real-time property for drilling and measuring, needs short measuring time and is suitable for geological conditions of any terrane.geological condition.

The invention relates to a pipeline leakage test set and method. The test set comprises a power system, a leakage unit, a valve, a temperature meter, a volume flowmeter and a pressure meter. The power system is connected with the leakage unit through a pipeline. Two ends of the leakage unit are respectively connected with the valve, the temperature meter, the pressure meter and the volume flowmeter. Calculated and metered values of gas or liquid stable leakage rates are compared to obtain a correcting model of a gas or liquid stable leakage rate equation; the model is applicable to the research on features and regulations of stable and dynamic leakage of gas, liquid or gas-liquid mixture in pipes or storage tanks under various different leakage conditions; the theoretical basis for the daily safety maintenance of long-distance pipelines and the emergency relief and investigation of leakage accidents is provided.

A method for monitoring an evaporative emissions control (EVAP) system that includes compensating a diagnostic leakage test based on a fuel consumption amount during a test interval is disclosed. The method includes establishing a leak test pressure in the EVAP system, operating the operating the associated valves and pumps such that the EVAP system is expected to be isolated, determining an actual pressure change of the EVAP system, determining an expected pressure change of the EVAP system based on vehicle operating conditions that include the fuel consumption amount, and indicating that a leak is detected if the actual pressure change differs from the expected pressure change by more than a difference threshold.

A plating method includes holding a substrate with a substrate holder while bringing a sealing member into pressure contact with a peripheral portion of the substrate to form an enclosed internal space in the substrate holder; performing a first-stage leakage test of the substrate holder by producing a vacuum in the internal space and checking whether pressure in the internal space reaches a predetermined vacuum pressure within a certain period of time; and if the substrate holder has passed the first-stage leakage test, performing a second-stage leakage test of the substrate holder by closing off the internal space after producing the vacuum therein and checking whether a change in the pressure in the internal space reaches a predetermined value within a certain period of time.

The invention relates to a one-way valve rubber tube positive pressure opening and negative pressure leakage detection device and operation method. The detection device comprises a positive pressure opening test circuit and a negative pressure leakage test circuit; the control of the positive pressure charging of the positive pressure opening circuit is realized by a positive pressure regulating valve 1; in the negative pressure leakage circuit, negative pressure is generated by adopting a vacuum generator 2, and the control of the negative pressure charging is realized by a negative pressure regulating valve 3; and the on-off of both the circuits is controlled by an electromagnetic valve 4, and the two circuits are in parallel connection, so that the mutual interference between the two circuits is avoided, and the functions of the detection of positive pressure opening and negative pressure leakage can be performed individually. The detection device comprises a touch screen of a man-machine interface, the touch screen of the man-machine interface realizes the input of test parameters, charge pressure, time and pressure detection value are preset through the interface, and work orders are given by a control system. Detection parameters can be set by workers according to the actual specifications and requirements of a rubber tube to be detected, and thus, the flexibility in detection is enlarged. The one-way valve rubber tube positive pressure opening and negative pressure leakage detection device is simple in structure, easy to operate by workers and high in degree of intelligence and can be popularized and applied to rubber tube enterprises.

The invention relates to a portable multifunctional insulated instrument test rack belonging to a working experiment table for carrying out pressurization and current leakage tests on an insulated instrument and a lightning arrester. Four insulated columns are fixed on a rectangular aluminum alloy platform, an insulated connecting rod is arranged between the upper parts of the two adjacent insulated columns to form an insulated frame part which is provided in parallel with more than two aluminum alloy rods, a test pressurization line is fixed on one of the aluminum alloy rods, insulating rods are fixed on the rest aluminum alloy rods, a clamp is fixed at the lower end of each insulating rod, an aluminum alloy water tank with a cover is arranged on the rectangular aluminum alloy platform, a hole is arranged in the cover of the water tank, the lower end of the test pressurization line penetrates into the water tank from the hole in the cover, and a grounding bolt is arranged on a water tank panel. The invention has the advantages of convenient use and experimental time saving and is suitable for the tests of insulated instruments and lightning arresters of different specifications under 35 Kv.

The invention relates to a novel leakage detecting-positioning method of urban natural gas pipelines and a system thereof. An infrared laser device, a laser device temperature and current controller and a signal generator are arranged in a case. A light outlet of the infrared laser device is positioned at the front end of a light inlet window sheet of a multiple-reflection absorbing pool, wherein, an air outlet of the multiple-reflection absorbing pool is connected with a micro suction pump, and an air inlet thereof is connected with a hose. The end of the hose is connected with a sampling probe. An exhaust port of the micro suction pump is communicated with the atmosphere out of the case. The laser entering the multiple-reflection absorbing pool is radiated out from the light outlet window sheet of the multiple-reflection absorbing pool and received by a laser detector. A signal output of the laser detector conducts a signal treatment. The sampling probe adopts air suction type sampling so as to lead the detection to be more flexible and convenient as well as provide high resolution. By adopting a laser spectrum technology which reacts to CH4 only, the detection limit reaches one part per million (PPM) level and the fine change of the density of the CH4 gas around a leakage point caused by the leakage of the natural gas pipeline can be detected.

The invention provides a method for processing a reducing gear front shell of automobile parts, which comprises the following steps: according to the requirements of a drawing, roughly and finely lathing the end face of a small end and the smallest outer circle, lathing a large plane and a retainer, boring an inner hole, lathing feet R and cutting grooves; finely boring two smallest inner holes while ensuring the coaxiality of the two holes is no more than phi0.04; drilling nine phi12.5 holes and four phi6.7 holes on a central line shown in the drawing; milling a left side small plane parallel to a big plane and roughly and finely boring inner holes on the small plane; milling a small boss plane on an upper right part and rilling a phi22.5 through hole; reaming a phi26 holes on in the nine phi12.5 holes; tapping threads; doing tests by using corresponding measuring tools and apparatuses; and doing a leakage test by applying a pressure of 8 bar without leakage. The method fully guarantees the product in hole-to-hole center line parallelism and coaxiality as well as pressure leakage and high quality, prolongs the service life of the product and meets the requirement for the rapid development of the automobile industry.

The invention belongs to the field of petroleum engineering, and particularly relates to an experimental device and an experimental method for simulating dynamic leakage and leaking stoppage of drilling fluid. The experimental device for simulating the dynamic leakage and leaking stoppage of the drilling fluid comprises a first high-pressure nitrogen bottle, a first circulating cylinder, a leakage test cylinder, a second circulating cylinder, a second high-pressure nitrogen bottle and a servo control injection pump, wherein the first high-pressure nitrogen bottle is connected with the bottom end of the first circulating cylinder; the two ends of a fifth high-pressure pipeline are respectively connected with the upper end of the first circulating cylinder and the upper end of a rock core clamping device; the servo control injection pump is connected with the lower end of the leakage test cylinder; the second high-pressure nitrogen bottle is connected with the bottom end of the second circulating cylinder; the two ends of a fourth high-pressure pipeline are respectively connected with the upper end of the second circulating cylinder and the upper end of the rock core clamping device. According to the experimental device and the experimental method, the positive circulating and positive circulating dynamic leaking stoppage processes of the drilling fluid on the end surfaces of rock cores with different lithological characters in an original crustal stress state can be really simulated; the simulated rock core size is large; the experimental method is simple; the experimental error is small; the experimental device and the experimental method have higher guidance value to field application.

The invention provides a simple high-temperature testing device and method for a flange rubber sealing element. A lower flange is in butt joint with an upper flange; the end face of the lower flange which is contacted with the upper flange is provided with a ring groove which serves a sealing groove for assembling the flange rubber sealing element to be tested; an upper cover is welded on the top of the upper flange; a bottom cover is welded at the bottom of the lower flange; the upper cover is connected to a gas medium charging pipeline; one end of a thermocouple is inserted into the upper flange through a gap, and the other end of the thermocouple is connected with a temperature indicator; and the upper flange and the lower flange which are connected one above the other are arranged in a high-temperature oil bath container. In the invention, a gas source is cut off by pressurizing under the normal-temperature condition, and a pressurizing way for reaching a preset pressure at the high temperature by using a gas expanding principle is adopted, so that the pressure constancy under the high-temperature condition is ensured; and an oil bath heating way is adopted, so that rapid heat transfer of a leakage test tool is realized. Due to the adoption of the device and the method, detection of the high-temperature sealing property of the rubber sealing element at the extreme usage temperature during short-time use is realized, and the development cost is greatly saved.

An airtight tester is used to test air tightness at a testing position of an object to be tested. The airtight tester includes a base, a leakage-test pipe, a moving unit, and a detector. The leakage-test pipe is connected to a pressure source, such that the pressure source may output a pressure to the leakage-test pipe. When the leakage-test pipe covers at the testing position of the object, the moving unit is pressed at an outer edge of the leakage-test pipe, so that the leakage-test pipe is jointed to a surface of the object, and thus, the detector detects the pressure state of the leakage-test pipe. Therefore, the testing staff obtains the air tightness of the object through an output message of the detector, and thus strengthening the structure of the object through utilizing the information.

The invention discloses an all-hydraulic steering gear test system, which comprises an oil tank, a motor pump system, a pressure and flow control valve system, a temperature control heating system, a filtering system, a circulation cooling system, an oil circuit switching control system, a steering power loading module, a bridge-type analog loading module, an oil cylinder working condition loading module, a sensor data acquisition module, an electronic control system and a computer data processing center. According to the all-hydraulic steering gear test system, the switching control of various oil circuits can be carried out by the oil circuit switching control module, the test of a load sensing type steering gear and other steering gears of the same type can be realized, the types of test items are more complete and comprise a power steering performance test, an end point sensing end point slippage test, a neutral position replaying test, a pressure loss test, an internal leakage test, a flow change rate test, a manual steering voltage efficiency test, a road sense test and the like, and the test requirements on the all-hydraulic steering gear in China and abroad can be met.

The invention discloses a deep water pipeline multi-circuit bridging system and a testing and installing method thereof. The deep water pipeline multi-circuit bridging system comprises a seabed manifold, an underwater electric distribution assembly, a first underwater Christmas tree, a second underwater Christmas tree, a first underwater umbilical cable terminal and a second underwater umbilical cable terminal, wherein the seabed manifold, the underwater electric distribution assembly, the first underwater Christmas tree, the second underwater Christmas tree, the first underwater umbilical cable terminal and the second underwater umbilical cable terminal are connected through a hydraulic bridging wire and a water and gas injection pipeline. The hydraulic bridging wire comprises male connector terminals and female connector terminals matched with the male connector terminals. The testing and installing method of the deep water pipeline multi-circuit bridging system includes the following steps that a leakage test and a flushing test are performed on the male connector terminals and the female connector terminals, after the tests are finished, the water and gas injection pipeline and the hydraulic bridging wire are moved underwater, and the water and gas injection pipeline and the hydraulic bridging wire are installed between underwater equipment respectively through the ROV operation. According to the deep water pipeline multi-circuit bridging system and the testing and installing method thereof, fast connecting and disconnecting between the underwater equipment can be achieved, it is ensured that all key parts and moving portions can be recycled, and the stopping and connecting states of an ROV can be safe and reliable.