The applied numerical calculations to determine the stroboscopic effect visibility measure (SVM) of a specific temporal light modulation waveform will influence the uncertainty of the determined value. An investigation of the achievable uncertainty under application of zero-padding and quadratic interpolation for peak finding is performed. This is done for sinusoidal and square verification waveforms outlined in IEC TR 63158 and demonstrates that using the referenced Stroboscopic effect visibility measure toolbox gives deviations from the reference values of up to 2.2%. Applying a combined optimised method of zero-padding and quadratic interpolation deviations less than 0.05% are achieved and yielding consitent. Result over different sampling frequencies. The verification waveforms are generated on a programmable light modulator and measurement results are shown.