DIN 50157-2-2020 金属材料. 使用具有机械穿透深度的便携式测量装置进行硬度试验. 第2部分: 试验设备的验证和校准
Metallic materials - Hardness testing with portable measuring devices operating with mechanical penetration depth - Part 2: Verification and calibration of the testing devices
This part of DIN 50157 specifies a method for the testing and calibration of portable measuring instruments with mechanical penetration testing according to DIN 50157-1.