Patent ID: 8212205

Claim:
A method for automatically checking sheet-shaped documents of value, comprising the following steps: defining the position of two measuring tracks of a measuring apparatus in such a way that at least the presence of two different not visible spectral properties of a predetermined type of authentic documents of value can be checked, wherein the two different not visible spectral properties are provided in certain areas of the documents of value, and said checking of at least the presence of the two different not visible spectral properties can be conducted independently of whether the document of value is in a first position or in a second position rotated by 180° in relation to the document plane, irradiating the document of value along the measuring tracks, capturing measuring values of the irradiated document of value along the measuring tracks, wherein at least in a part of the measuring tracks the measuring is carried out at least two spectrally spaced-apart measuring frequencies, and ascertaining, whether the at least two different spectral properties of the predetermined type of authentic documents of value were captured.