[en] Two times two reference batches of BCR material with nominal energies of 80J and 160J were impact tested on an instrumented machine. A good agreement was found between the friction-corrected dial energy and the integrated energy. Systematic differences have been detected between the two 80J batches: these differences do not occur in the typical force values and are a consequence of a post-maximum event. A small calibration difference exists for the 80J batches: this seems a consequence of the higher impact forces involved and suggests the influence of dynamic effects on the calibration (static, in-situ). The next step is to test similar batches on a non-instrumented impact tester to detect an eventual influence of the physical presence of instrumentation on the impact pot. It is expected that this effect will be minor