63results about How to "The test is convenient and accurate" patented technology

A semiconductor integrated circuit (1) includes first, second and second functional blocks (10, 20 and 30). The first, second and second functional blocks (10, 20 and 30) are coupled together via an inter-block signal line (2). The first functional block (10) includes: a logic circuit (11); a test data output circuit (12), which operates during testing and outputs a predetermined test data pattern; a testing standby circuit (14), which is connected between a selector (13) and an external bidirectional pin and makes the functional block enter a standby state during testing; a tristate buffer (15) that is made to have a high impedance by the testing standby circuit (14); and a decision result output circuit (16), which receives the test data pattern from the second functional block, compares the received test data pattern to an expected value stored therein, and outputs a decision result to a decision result signal line (5).

The invention relates to a device for testing the power of a USB interface, comprising a first USB interface, a second USB interface and an analog device. The first USB interface is used for connecting a circuit board to be tested, the second USB interface is used for connecting a USB device; the analog device comprises a first voltage stabilizer, a first resistor, a second resistor and a load resistor; the first voltage stabilizer comprises an input end, an output end and an adjusting end; a signal pin of the first USB interface is correspondingly connected with a signal pin of the second USB interface; the voltage end of the first USB interface is respectively connected with the voltage end of the second USB interface and the input end of the first voltage stabilizer; the first resistor is connected between the output end and the signal pin of the first USB interface; the signal pin of a voltage stabilizer is grounded by the second resistor, and the output end of the voltage stabilizer is grounded by the load resistor. The device for testing the power of the USB interface is convenient to test accurately.

The invention relates to an intelligent testing device for soil mass layered permeability characteristic analysis. The intelligent testing device is characterized by comprising a soil containing unit, a water supply device and an intelligent testing unit; the soil containing unit comprises a cylindrical glass barrel, water seepage valves, a cylindrical base, a water seepage pipe and a metal pore plate; the water supply unit comprises a constant-temperature water pump, a water pipe and a sprayer which are sequentially connected. The intelligent testing unit comprises a water content sensor, a water seepage quantity sensor and a water pressure sensor which are connected with a computer through signal receivers. The water supply unit is located over the soil containing unit. Multiple soil mass layered structures with the same height are arranged in the cylindrical glass barrel from bottom to top. A water content sensor, a water seepage quantity sensor and a water pressure sensor are arranged on the inner side wall of each layered structure. The soil mass layered permeability characteristic status can be easily, conveniently and precisely tested, the positioning precision of a system, a measuring method and an evaluation method are provided, and the intelligent testing device is suitable for replacing existing products in the field.