Abstract— <p>The article proposes a method for measuring the absolute energy sensitivity of digital sensors depending on the wavelength of the recorded radiation. The principle of the method allows ignoring the internal software mechanism for processing information in the digital sensor. The results of testing the method for the case of a CCD sensor are presented based on processing the recorded images of radiation sources in the spectral range of 0.4–1.1 μm. The testing was carried out for two types of radiation sources, laser and incandescent lamp, with a discussion of their advantages and disadvantages. The proposed method will allow determining the amount of energy of radiation recorded in experiments in the corresponding local spectral intervals in which calibration was carried out. A demonstration calculation of the energy of radiation scattered by laser plasma is given.</p>