What is the testing principle of a micro Vickers hardness tester?

Taiwan Nakazawa Co., Ltd. answers for you:
(1) At the beginning of the measurement, the micro Vickers hardness tester presses a square pyramidal diamond indenter with an angle of 136° between opposite faces into the material surface with a loading force of 49.03 ~ 980.7N. After maintaining for a specified time, observe and measure the diagonal length of the indentation through a microscope, and then calculate the hardness value according to the formula.
(2) The automatic measurement micro Vickers hardness tester connects the microhardness tester with a computer through a CCD camera interface, and the entire testing process can be completed through simple operations of the keyboard and mouse. The measurement and control of this system are completed through high-resolution imaging devices and computer software, which increases the speed and flexibility of testing, eliminates human operational errors from the eyepiece system, and can meet various microhardness testing requirements.