Light source pulsed with irregular pulse sequence in analog photometric signal evaluation for a test carrier analysis system

A method for detecting and evaluating analog photometric signals in a test carrier analysis apparatus, comprising the steps of:

• holding a test field of a test carrier in a holder on the analysis apparatus;
• irradiating said test field by a light source, said light source being clocked in light and dark phases;
• detecting light reflected by the test field, said detecting being conducted by a measurement receiver, said measurement receiver providing measurement signals representing a measured value indicative of the detected light;
• evaluating the measured value in a measurement integration and digitalization circuit, said evaluation including the steps of integrating the measured value over at least part of each light phase of a plurality of light phases of a measurement period of said clocking and over at least part of each dark phase of a plurality of dark phases of the measurement period;
• forming a total integrated value from integrals of the light phases and dark phases in the evaluation step,
• wherein the light phases and dark phases within the measurement period form an irregular sequence having a frequency spectrum which comprises a large number of different frequencies.