Olympus X-Tr Посібник з ремонту - Сторінка 11
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2-7) Maximize or minimize interpupillary
2-7)
distance, and if these centers are not
concentric, optical axes are eccentric.
2-8) Adjustment of optical axes
Adjust optical axes so that centers of
concentric circles and cross hairs do
not depart from each other even at
maximum or minimum interpupillary
distance.
a. After coinciding centers of cross
hairs and concentric circles, rotate
prism housings.
b. If center of concentric circles
moves, detennine center of the move-
ment from the locus of its movement
(concentric circles move centering
around this center).
c. Coincide locus center and center of
concentric circles. (Move test plate)
d. After determination of locus center,
rotate three screws NU2.6x6SA to
move prism and prism mount AA4894
together until centers of cross
hairs and concentric circles are
coincided.
e. Repeat steps above until cent ration
is complete.
11len clamp screws.
Allowance of centeringdeviation:
0.2 on image plane
f. Follow steps above with left
porro-prism.
- 9 -
Before
rotation
2-8) b.
2-8)
Co
Prior to
centiation
2-8) d.
o.os-j
r
ro.2S
Decent ration
after rotation
~f
locus
\
After
coincidence
2-8)
e
0.2 (on image plane)
=
Obj. magnification
(on zoom scale) x
Distance (on specimen
surface)
Ex. Zoom scale • 4
0.2 • 4
X
X
0.2
X •
4
=
0.05
The allowance 0.05 at zoom scale 4
equals one graduation of the concentric
circle from the center.