To stay compliant with ASTM E23 and ISO 148, labs should run regular indirect verification using certified reference specimens. In practice this means testing impact reference bars with known absorbed energy and comparing the measured values to the certified range. If the results stay inside the allowed tolerance, the machine is considered fit for use.

Routine checks also include confirming the pendulum starting angle, checking the zero position, and verifying that the energy scale and digital readout agree. On instrumented versions, the force signal should be checked with the appropriate procedures so that force–time data is reliable.

These verifications are typically done at defined intervals, for example annually by an accredited service provider and more frequently as internal checks. Results should be recorded with date, operator, reference bar batch and observed values. This documentation is important for audits, customer requirements and internal quality records.

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