ISO 6506-2:2017规定了用于根据ISO 6506-1测定布氏硬度的试验机的直接和间接验证方法，还规定了必须进行这两种验证的时间。 直接验证包括检查单个机器的性能参数是否在规定的范围内，而间接验证则利用根据ISO 6506？3校准的参考试块的硬度测量来检查机器的整体性能。 如果试验机也用于其他硬度试验方法，则必须对每种方法进行独立验证。 ISO 6506-2:2017适用于固定位置和便携式硬度试验机。对于无法满足规定力-时间曲线的机器，可使用附录B修改力和试验循环的直接验证。

ISO 6506-2:2017 specifies methods of direct and indirect verification of testing machines used for determining Brinell hardness in accordance with ISO 6506？1 and also specifies when these two types of verification have to be performed. The direct verification involves checking that individual machine performance parameters fall within specified limits whereas the indirect verification utilizes hardness measurements of reference blocks, calibrated in accordance with ISO 6506？3, to check the machine's overall performance. If a testing machine is also to be used for other methods of hardness testing, it has to be verified independently for each method. ISO 6506-2:2017 is applicable to both fixed location and portable hardness testing machines. For machines that are incapable of satisfying the specified force-time profile, the direct verification of force and testing cycle can be modified by the use of Annex B.