41 results about "Critical test" patented technology

A test circuit that compares test results between two tests with different local supply voltages is provided. The output of each stage of the logic circuits is stored in a first register of each test circuit. Each test is performed with a critical test vector and a local supply voltage that decreases from test to test. The outputs of successive tests are compared in each test circuit. The tests are performed iteratively with successive reduction in the value of the local supply voltage until at least one stage of the logic circuits produces non-matching results between the first and second register. The voltage immediately before producing such non-matching results is the minimum operational voltage for the local voltage island.

The technology and economics of system testing have evolved to the point where a radical change in methodology is needed for effective functional testing of systems at clock rates of 1 GHz and higher. Rather than providing a test fixture to interface between the system under test and an external tester, it is preferable to provide critical testing functions within each electronic system in the form of one or more special-purpose test chips. An architecture is proposed that supports full-speed testing with improved noise margins, and also efficient methods for learning correct system behavior and generating the test vectors. The test program is preferably written using the same programming language as used for the system application.

An embodiment of the present invention provides an optical time domain reflectometer test method and an optical time domain reflectometer. The method includes: triggering an optical time domain reflectometer OTDR to generate an initial optical signal according to initial test parameters, and injecting the initial optical signal into an optical fiber During the test, the current test distance obtained by detecting the initial optical signal is detected, and if it is judged that the current test distance is not less than the critical test distance, the OTDR is triggered to generate a modulated optical signal, and the modulated optical signal and the initial optical signal are emitted together. into the fiber for testing. The embodiments of the present invention increase the optical power of the test input end by triggering the OTDR to generate a modulated optical signal when the current test distance is not less than the critical test distance, so the measurement range of the OTDR can be expanded, thereby solving the problem of the fixed measurement range of the OTDR and the noise of the measurement track flooding problem.

The invention discloses a test method for measuring the parking critical parking speed of automatic transmission P gear. Collector; 2) Adjust the inertia of the flywheel disc of the inertia flywheel box; 3) Install the shifter and the shift cable to the test measurement device; 4) The computer controls the drive motor according to the test requirements; The torque data is saved, processed and displayed by the computer in real time; 5) The half-shaft speed at the last moment when the half-shaft speed suddenly changes to zero is obtained through computer analysis, and the half-shaft speed is converted into the corresponding vehicle speed, which is the automatic transmission P gear Parking critical parking speed. The invention can accurately measure the critical parking speed of the P-gear under the simulated automatic transmission vehicle test condition, thereby providing strong support for the test of the P-speed of the automatic transmission.

The invention discloses a critical test simulation device for penetration split grouting, comprising a covering earth pressure simulation unit, a grouting test tank unit and a confining pressure simulation unit. The grouting test tank unit comprises a steel outer cylinder, a steel inner cylinder A cylinder, and a soil sample set in a steel inner cylinder, the steel outer cylinder is provided with a first cover, a cavity is formed between the steel outer cylinder and the steel inner cylinder, and the steel inner cylinder is The side wall of the cylinder is provided with holes that communicate with the cavity, the inner wall of the steel inner cylinder is provided with geotextiles, the bottom of the grouting test tank unit is installed with a piezometer and a first drainage pipe, the soil sample A pressure bearing plate is arranged above and below the first cover body, a grouting pipe is arranged on the first cover body, and a grouting pipe is arranged on the first cover body for injecting between the first cover body and the pressure bearing plate. A gas pipe through which high-pressure air is introduced into the void. The device of the invention eliminates the time and cost spent on field test grouting, and effectively improves the effect of on-site penetrating grouting.

The invention discloses a single-rod boiling critical test device and method of a nuclear reactor under the condition of six-degree-of-freedom motion. The test device can carry out a closed forced circulation and natural circulation flow heat transfer test, and includes a shield pump, a voltage stabilizer and an orifice flow rate. meter, preheating section, test section, heat exchanger, metal hose, make-up pump, etc. The test section adopts the method of electric heating, and the main circuit is placed on a two-ton six-degree-of-freedom motion platform as a whole, which can complete the relevant research on the influence of ocean conditions on the critical heat flux density. Deionized water is used as the flowing working medium, and the deionized water enters the horizontal serpentine preheating section from the stabilizer and the shield pump (natural circulation without the shield pump), then enters the test section, and then passes through the heat exchanger, and finally returns to the steady state. Pressurizer to form a closed loop.