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Figure 10-4.  Dioptometer
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Telescope Test Fixture.
TM 9-254 10-4. Dioptometer - Continued b. Use.    The  dioptometer  can  be  used  for  accurately  setting  and  checking  the  diopter  setting  of  fire  control sighting   instruments.      It   can   also   be   used   for   checking   definition   of   field-of-view,   parallax,   and   astigmatism   in   an instruments  optical  system.    The  dioptometer  is  placed  between  the  eye  and  the  instrument  to  be  checked  and  the focusing sleeve is adjusted until the field-of-view is in sharp focus.  The diopter setting of the instrument is then read on the objective diopter scale at the focusing sleeve.  When the fixed focus eyepiece of an instrument is properly adjusted, the indication on the dioptometer should be -3/4 to -1 diopter, as read on the objective diopter scale (fig. 10-4). Section II.  TEST FIXTURES 10-5. General. The  test  fixtures  listed  in  this  section  are   those   most   commonly   used   in   the   rebuild   and   inspection   of   fire   control instruments.  These particular test fixtures are of a universal type and with the use of special adapters each test fixture can accommodate many different fire control instruments. 10-6. Azimuth Test Fixture. a. Description.    The  azimuth  test  fixture  (fig.  10-5)  consists  of  a  base,  azimuth  ring,  vernier  scale,  adapter support plate, and column.  It uses various mounting adapters to accommodate different fire control instruments and uses a projector collimator for a test target. (1) The base is cast iron having three leveling screws.  It mounts and supports the other components of the fixture. (2) The  azimuth  ring  is  precisely  machined  and  graduated  into  6400  mils  by  six  hundred  forty  engraved lines, each of which represents 10 mils.  The ring can be set at any position and locked in place with a clamping  arm  which  is  mounted  under  the  base.    A  spring  loaded  plunger  and  adjustment  screw provides for fine adjustment of the azimuth ring. (3) The vernier scale mounts on the base in a machined track.  It has an engraved scale consisting of fifty- one  graduations.    Each  graduation  represents  0.2  mil.    Every  tenth  line  is  numbered  progressively  by increments of two from 0 to 10.  It is possible to estimate readings as small as 0.1  mil  on  the  vernier scale. (4) The column clamps to the base and supports the projector collimator. (5) The  adapter  support  plate  is  fastened  to  the  spindle  of  the  azimuth  ring,  concentric  to  the  ring.    A machined  surface  perpendicular  to  the  axis  of  the  spindle,  provides  the  mounting  surface  for  the  test fixture  adapters.    Three  cam-head  screws  in  the  plate  permits  easy  clamping  of  the  adapters  on  this surface. b. Use.    The  azimuth  test  fixture  is  used  for  adjusting  and  inspecting  panoramic  and  azimuth  indicating,  fire control  instruments  such  as  the  M-2  Aiming  Circle,  M117  Panoramic  Telescope  and  the  M12A7  Panoramic  Telescope. Parameters that can be checked with this test fixture are; backlash in azimuth and elevation gears, level travel, azimuth and micrometer scale accuracy, and counter accuracy. Change 2  10-4

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