This part of ISO 148 covers the verification of the constructional elements of pendulum-type impact testing machines. It is applicable to machines with 2 mm or with 8 mm strikers used for pendulum impact tests carried out, for instance, in accordance with ISO 148-1.

It can analogously be applied to pendulum impact testing machines of other capacities and of different design.

Impact machines used for industrial, general or research laboratory testing of metallic materials in accordance with this part of ISO 148 are referred to as industrial machines. Those with more stringent requirements are referred to as reference machines. Specifications for the verification of reference machines are found in ISO 148-3.

This part of ISO 148 describes two methods of verification.

• The direct method which is static in nature and involves measurement of the critical parts of the machine to ensure that it meets the requirements of this part of ISO 148. The verification equipment shall have a certified traceability to the International Unit System. The direct method shall be used when a machine is being installed or repaired, or if the indirect method gives an incorrect result.
• The indirect method, which is dynamic in nature, and which use reference test pieces to verify points on the measuring scale.

A pendulum impact testing machine is not in compliance with this part of ISO 148 until it has been verified by both the direct and indirect methods (see clause 12).

The requirements for the reference test pieces are found in ISO 148-3.