Automation of BESSY scanning tables
J. Kesteman, J. Hanton · CERN Document Server (European Organization for Nuclear Research) · 1981
A microprocessor M6800 is used for the automation of scanning and premeasuring BESSY tables. The tasks achieved by the microprocessor are: control of spooling of the four asynchronous film winding devices and switching on and off the 4 projection lamps; preprocessing of the data coming from a bipolar coordinates measuring device; bidirectional interchange of information between the operator, the BESSY table and the DEC PDP 11/34 mini computer controlling the scanning operations; control of the magnification on the table by swapping the projection lenses of appropriate focal lengths and the associated light boxes (under development). In connection with the last of these, study is being made for the use of BESSY tables for accurate measurements (+/- 5 microns), by encoding the displacements of the projection lenses. (0 refs).