Digital Micro Vickers Hardness Tester - ASI-HVD-1000AT

The digital micro Vickers hardness tester is suitable for testing metal stuctures, including tiny pats, thin plates, metalfoils, wires, thin hardened layers and electroplated layers. It can also be used to test non-metallic mateials such asglass, jewely and ceramics that cannot be tested by the Rockwell test method and other relatively large test force tests.In paticular, it can follow the stucture of metals and test the intenal hardness of mateials such as induction hardening or carbuization. The digital display microhardness tester is a high-tech product of optomechanical integration. The hardness tester isnovel in shape, has good reliability, operability and repeatability, and is an ideal product for testing microhardness.The machine uses C language programming, high-magnification optical measurement system and optical dual-channelstucture, new technologies such as optoelectronics and photocouple sensing. Through key operation, the length of themeasured indentation can be input on the key, the hardness value, the conversion scale, the test force, the test forceholding time and the number of measurements can be displayed on the LCD screen. The digital micro hardness tester can also be configured according to the special needs of users. It can take pictures ofthe measured indentation and the metallographic stucture of the mateial, a visual screen measuing device and an automatic indentation measuing device. As well as the detemination of Knoop hardness. 

1.2 The pinciple of Vickers hardness and Knoop hardness

1.2.1 Vickers HV

The Vickers hardness test is to use a 136° regular diamond indenter to press into the suface of the object to be tested with a specified test force ‡Fˆ. After the specified time of maintaining the test force, the test force is removed, and the test piece is measured with a micrometer eyepiece The diagonal line of the indentation on the suface (d), calculate the average pressure ‡N/mm2ˆ of the conical suface area of the indentation, which is the Vickers hardness value.