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美国宾夕法尼亚州的克雷特克雷默·布雷桑公司((?)rautkramer Branson)研制功成一种微型超声硬度计。在负荷作用下,测量的硬度值通过数字式显示器(CED)显示。由于可直接显示出洛氏硬度(HRC20～98)和维氏硬度(Hv50～990)标尺,这样可以避免单位之间换算的误差,而且可适用于广泛材料的硬度检测。硬度试验采用一标准维氏金刚钻压头,在低负荷下进行,压头压入而形成的显微压痕,实质上为无损压痕。该硬度计可根据试件形状,装上可换式压头。试验时仅需接近试件的试验表面,可
Crete Kramer Breisen Company (?) Rautkramer Branson, Pennsylvania, USA has developed a miniature ultrasonic hardness tester. Under load, the measured hardness value is displayed by a digital display (CED). Since the Rockwell hardness (HRC20 ~ 98) and Vickers hardness (Hv50 ~ 990) scale can be directly displayed, it can avoid the conversion error between units and can be applied to the hardness detection of a wide range of materials. Hardness test using a standard Vickers Diamond Indenter, carried out under low load, indentation formed by micro-indentations, essentially indentation indentation. The hardness tester according to the shape of the specimen, fitted with a changeable pressure head. The test only needs to be close to the test surface of the test piece