39results about How to "Controllable test process" patented technology

The invention discloses a method for observing expansion procedures of soil mass shear bands in confining pressure states. The method includes steps of firstly, sampling soil; secondly, carrying out shear tests, acquiring images of microscopic structures of soil masses, acquiring shear test results of to-be-tested soil samples at a plurality of different depth positions on the to-be-tested soil mass shear bands in the confining pressure states; thirdly, ranking the shear test results. When the shear tests are carried out on the to-be-tested soil samples and the images of the microscopic structures of the soil masses are acquired, procedures include clamping the soil samples and pressure devices, carrying out the shear tests, dropping solidifying liquid into the soil samples, flatly cutting the bottoms of the soil samples, propping the soil samples, flatly cutting the tops of the soil samples, fetching soil mass test specimens out of shear gaps, carrying out subsequent treatment on soil mass test specimens in the shear gaps and scanning the soil mass test specimens by the aid of electron microscopes. The method has the advantages that the method includes the simple steps, is reasonable in design and easy and convenient to implement, good service effects can be realized, the shear strength of the different depth positions on the tested soil mass shear bands in the confining pressure states and microscopic structures of shear positions can be easily, conveniently and quickly acquired, and accordingly the expansion procedures of the soil mass shear bands in the confining pressure states can be easily, conveniently and visually observed.

The invention relates to a high-precision detection method and circuit for dynamic response of a power supply. It includes an LDO circuit to be tested and a test power supply circuit; the test power supply circuit includes a first high-precision low-temperature drift power supply, a second high-precision low-temperature drift power supply, and a high-speed power switch S1; the high-speed power switch S1 is controlled to be on and off. When the state is cyclically switched, the first test voltage and the second test voltage can be cyclically loaded to the power supply terminal of the LDO circuit to be tested, according to the corresponding working state of the LDO circuit to be tested under the first test voltage and the second test voltage , so as to be able to determine the dynamic response of the power supply of the LDO circuit under test. The invention can effectively realize the power dynamic response test of the LDO, the test process is controllable, and the test efficiency and reliability are improved.