Measuring apparatus, particularly measuring apparatus for sensing metal articles

A measuring apparatus for sensing metal articles comprising:

• a transmission coil configured to generate a magnetic field;
• two reception coils which are oriented relative to one another and electrically connected to one another in a region of the magnetic field in such a way that a resulting reception voltage across the two reception coils is zero when the magnetic field acts on the two reception coils in the same way;
• a control device configured (i) to supply an alternating transmission voltage to the transmission coil, and (ii) to change a root mean square value of the alternating transmission voltage in such a way that the resulting reception voltage remains below a predetermined threshold value irrespective of the size of the metal article;
• and
• a determination device configured to determine the metal article on the basis of the resulting reception voltage.