A data analysis method for the spherical indenter geometry has been produced that capitalises on recent hardware developments of instrumented indenters, specifically the high data capture rate. The data analysis is based on a multi-cycle load test regime and the main refinement is the fitting of the data along the unload curve to a Hertzian contact model in order to calculate the residual depth and gradient of the unload curve for each cycle. In practice, it was found that there were non-Hertzian regions along the unload curve and this was attributed to both material and instrument (nanoindenter) behaviour. Refinement of the updated data analysis method has been achieved by systematically deselecting these non-Hertzian regions and assessing the effect of this on the calculated contact depth and elastic modulus calculations for each cycle. Importantly, it was found that the updated method was less susceptible to erroneous or non-Hertzian load-displacement data giving increased confidence the in the mechanical property data from this new data analysis method.