The invention relates to measuring instruments, preferably of the kind
measuring absorbances, in an object, of electromagnetic radiation in at
least two spectral ranges, such as IR instruments, and DXR, meaning Dual
X-ray instruments, and more specifically to the determination of
properties of food or feed, such as the fat content in milk or meat. The
invention relates in particular to a method of providing a correction for
a slave instrument of the kind measuring properties of an object by
exposing the object to electromagnetic radiation, in particular X-rays,
in at least two spectral ranges and obtaining one or more object
responses thereto. The responses obtained being preferably based on
detecting attenuation and/or reflection and/or scatter of the
electromagnetic radiation in/from the object by use of one or more
detectors and are obtained in a form where they express properties of the
object either directly or via a transformation.
