In order to perform a dynamic calibration of a uniaxial testing system, it is necessary to measure the forces experienced by the test-piece to known levels of accuracy – this measurement is made by a dynamic calibration device (DCD) in place of the test-piece and the calibration method is described in ISO 4965‑1. This part of ISO 4965 defines the calibration procedure for the DCD’s instrumentation. The method for the analysis of the results is also described, leading to a range of testing frequencies over which the instrumentation is valid for use with DCDs in accordance with ISO 4965‑1.