ISO 148-3:2016根据ISO 148-2规定了用于摆锤冲击试验机间接验证的合格试件的要求、制备和方法。 它规定了标称尺寸与ISO 148-1中规定的相同的缺口试样；然而，公差更为严格。 注1:化学成分或热处理，或两者，根据所需的能量水平而变化。 注2:参考试样在参考摆锤冲击试验机上合格，ISO 148本部分也对其进行了描述。

ISO 148-3:2016 specifies the requirements, preparation and methods for qualifying test pieces used for the indirect verification of pendulum impact testing machines in accordance with ISO 148？2. It specifies notched test pieces with nominal dimensions identical to those specified in ISO 148？1; however, the tolerances are more stringent. NOTE 1 The chemical composition or heat treatment, or both, are varied according to the energy level desired. NOTE 2 Reference test pieces are qualified on reference pendulum impact testing machines which are also described in this part of ISO 148.