Method for pre-calibrating a spectroscopic measurement device, the measurement device having: • a control unit, • a light source, • a sample holder arranged in the beam path of the light source and defining a measurement location, • a spectral measurement module which has a photosensor with a plurality of organic photodiodes arranged on a substrate and with a temperature sensor, calibration values being determined at the measurement location and reference values being determined in a reference measurement plane in the beam path of the light source, the temperature sensor recording temperature values in the direct vicinity of the organic photodiodes, and the method comprising the following steps: i.) arranging a bright calibration sample having high reflectivity at the measurement location and determining a bright calibration value by measuring a deflected radiation by means of the photosensor; ii.) arranging a dark calibration sample having low reflectivity at the measurement location and determining a dark calibration value by measuring a deflected radiation by means of the photosensor; iii.) arranging a bright reference sample having high reflectivity in the reference measurement plane and determining a bright reference value by measuring a deflected radiation by means of the photosensor; iv.) arranging a dark reference sample having low reflectivity in the reference measurement plane and determining a dark reference value by measuring a deflected radiation by means of the photosensor; v.) recording a dark current signal when the light source is switched off; vi.) repeating steps i. to v. at different temperatures along a predetermined temperature curve, with the temperature and a bright reference value, a bright calibration value, a dark reference value, a dark calibration value, and a dark current signal being recorded for each temperature value; and vii.) storing the determined calibration and reference values and also the related temperature values in the control unit. • a control unit, • a light source, • a sample holder arranged in the beam path of the light source and defining a measurement location, • a spectral measurement module which has a photosensor with a plurality of organic photodiodes arranged on a substrate and with a temperature sensor, i.) arranging a bright calibration sample having high reflectivity at the measurement location and determining a bright calibration value by measuring a deflected radiation by means of the photosensor; ii.) arranging a dark calibration sample having low reflectivity at the measurement location and determining a dark calibration value by measuring a deflected radiation by means of the photosensor; iii.) arranging a bright reference sample having high reflectivity in the reference measurement plane and determining a bright reference value by measuring a deflected radiation by means of the photosensor; iv.) arranging a dark reference sample having low reflectivity in the reference measurement plane and determining a dark reference value by measuring a deflected radiation by means of the photosensor; v.) recording a dark current signal when the light source is switched off; vi.) repeating steps i. to v. at different temperatures along a predetermined temperature curve, with the temperature and a bright reference value, a bright calibration value, a dark reference value, a dark calibration value, and a dark current signal being recorded for each temperature value; and vii.) storing the determined calibration and reference values and also the related temperature values in the control unit.