The paper presents the results of research on commercial photovoltaic cells made of crystalline silicon. In particular, the focus was on the description of the elaborated by the authors measuring system with measurements methodology used for assessment of the influence of temperature on spectral characteristics of the tested cells, describing the dependence of the current sensitivity (spectral response, responsivity) and the external quantum efficiency on the wavelength of optical radiation. The investigations carried out in the proposed test system made it possible to evaluate the properties of the cells in the conditions similar to the operating conditions.