TM 5-6675-328-14
(6)
Adjust AS-1 to bring reflected reticle image into exact vertical and horizontal register with reticle image.
(7)
Raise leveling mirror out of operating position using cam lever and rotate mirror assembly 180°
NOTE
Do not move AS-1 vertically or horizontally.
(8)
Carefully lower leveling mirror into operating position using cam lever and use tangent screw of leveling mirror to
realine vertical wires.
NOTE
Difference between position of reflected image and reticle image represents twice the actual error between
true vertical and mirror surface.
(9)
If reflected image moved up, move adjusting nuts away from viewing instrument until one-half of error is
removed. If reflected image moved down, move adjusting nuts toward viewing instrument until one half of error is
removed.
(10)
Repeat steps (7) thru (9) until error is removed.
(11)
Reinstall mounting base and AS-1 on target post.
2-6.3 Operating Procedures. This manual is not intended to cover all available instruments. Although the following
guidelines should be helpful in testing all types of instruments.
Keep in mind that the calibrator must be correctly alined before any instrument can be correctly tested. Choose the
proper adapter to mount the instrument to be tested on the Ultradex. To test an alinement scope for example, a Model
88-6 mounting base must be installed on the test post. Both a coarse and fine vertical height adjustment is provided for
the test post. When transit or theodolite circles are to be checked make sure the Ultradex is leveled to within 30 arc
seconds of true horizontal.
Autocollimation and autoreflection checks can be made using Model 185 stellite mirrors when mounted on adjustable
mirror mounts on the target post.
When an optical plummet of a tribrach is to be checked, use the precision slides to position the tribrach over the OPC.
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