Leica Biosystems RM2255 - Manual (Page 35)

33 Leica RM2255
Directional specimen holder fixture
Orienting the specimen
Display of the zero position
For better display of the zero position, the orien-
tation has two red indicators (32).
When both indicators are visible and both set-
screws (30, 31) are in zero position at the same
time (click stop, white marking on ""), the speci-
men is in zero position.
5. Operation
The directional specimen holder fixture may be
exchanged for a non-directional fixture (optional
accessory).
The specimen orientation allows for simple posi-
tion correction of the specimen surface when the
specimen is clamped into place.
32
30 32
31
29
Fig. 20
When the large standard specimen
clamp (50x55 mm) is used, the speci-
men orientation of 8° in north-south
direction is no longer possible.
The usable angle is only about 4° in this
case.
In the quick clamping device of the directional specimen holder fixture, all specimen
clamps available as optional accessories can be used (implemented).
• Raise the specimen head to the upper end
position and activate the handwheel lock.
• To release the clamp, turn the eccentric lever
(29) forwards.
• Turn setscrew (30) to orient the specimen in
north-south direction. Turn setscrew (31) to
orient the specimen in east-west direction.
Each complete turn of the screw inclines the
specimen by 2°. A total of 4 complete turns = 8°
are possible in every direction. The accuracy
is approximately ± 0.5°.
For ease of estimation, there is a white mark on
the handle and a click stop that is noticeable
during turning.
• To lock the current orientation, turn the
eccentric lever (29) backwards.
Specimen blocks must NOT be oriented
during the retraction phase!
If a block is oriented during retraction,
the block will advance by the retraction
value PLUS the selected section thick-
ness before the next section.
This may cause damage to both speci-
men and knife.