Measuring mechanism for wide-angle moving coil systems and method for its assembly

A measuring mechanism for wide-angle moving coil systems, comprising:

• a mount with a movable part, and a magnetic system including an inner and an outer pole ring and two magnets, wherein a form-locking arrangement of said magnets and said pole rings relative to each other is provided such that said pole rings are mutually centered and fixed in this position in any direction, wherein each of said two pole rings terminates in two arms between which there is arranged a slot or spacing, said inner pole ring having an inner space for receiving the corresponding parts of said movable part including a part of a moving coil frame, which inner space is accessible from the outside through the slot arranged between the arms of said inner pole ring and the width of said slot is dimensioned in such a way that the pre-assembled unit including said mount and said movable part and its corresponding parts can be inserted through said slot into said internal space of said inner pole ring, said measuring mechanism also comprising a measuring mechanism carrier including support arms which extend over said magnetic system and support said magnetic system and said movable part, said support arms having external dimensions whose projection on said magnetic system extends, independent of its rotary position, over said magnetic system, particularly over the region of said outer pole ring, and said pole rings being dimensioned relative to each other and to said movable part so that they can be brought into the operating position in or through said movable part.