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The main customers of ductile cast iron are within the wind energy, the automotive and the general plant construction sector. Nowadays these customers frequently demand fracture mechanical evidence of the provided casts because of new design and certification guidelines (e. g. GL-DNV, FKM, BAM etc.). The determination of fracture mechanical values is possible using dynamic testing machines like servohydraulical or linearelectrical systems with a crack parameter sensor. In general these testing procedures are very time consuming and expensive (especially the testing facility itself). Alternative multiple-specimen-techniques only shift the expenses from the testing facilities and specimen to labor cost and are also not economically reasonable for small and medium sized foundries. One of the side tasks of the research project GussTough is the development of a Charpy Pendulum based single-specimen fracture mechanical testing technique which is able to provide fracture mechanical values for ductile and brittle material behaviour. The centerpiece of the development is the integration of an Alternating Current Potential Drop (ACPD) crack length measuring system. With a heavily modified calculation model based on SEB (Single Edge Bend) specimen and this crack parameter it is possible to create a J - Δa diagram out of one Charpy-V specimen.