目前,在金属硬度试验中,大部分是采用百分表测量,换算压痕深度。这样,就存在多种误差,例如,当试样卸荷后,压痕深度的弹性恢复和钢球压头弹性扁缩,造成压痕深度不真实。为了克服这些误差,我们自行研制了一套利用霍尔位移传感器测出真实的压痕深度,并采用单片机控制的自动测试系统。 At present, in the metal hardness test, most of them use dial indicator to measure the indentation depth. In this way, there are a variety of errors, for example, when the sample is unloaded, the indentation of the elastic recovery of the elastic head and steel ball flattening, resulting indentation depth is not true. In order to overcome these errors, we developed a set of Hall-based displacement sensor to measure the true indentation depth, and the use of SCM control system.