Perkins Mk2 Manuel D'instructions page 19

5. To Prepare the Prism for Use
5. Batteries -
5
Replace the handle and advance the thumb-wheel to check that both bulbs are switched on.
Fig 5a
Note:
Ensure batteries are inserted into handle with the correct polarity, as marked on the base and
in accordance with the Instruction Manual (Page 16, Batteries). Failure to do this will cause
short circuiting of batteries and dangerous overheating will occur.
Disposal of used batteries
Discharged non-rechargeable batteries should not be incinerated, but should be disposed of
in accordance with local environmental legislation.
Note: All batteries are subject to slow deterioration. Under no circumstances should batteries
be left indefinitely in the instrument as this could result in the instrument becoming
damaged. They should be removed after use and stored in the carrying case.
Bulbs
The bulbs, two in number, are "lens" lamps (6 Fig 1). They are clear and require the blue
filter sleeves to be fitted over them (5 Fig 1). The bulbs are fixed in position to create
maximum fluorescent effect during measurement. Bulbs must be screwed fully and firmly
in and periodically inspected for discolouration.
Forehead Rest
This is the concave disc (1 Fig 1) which snaps on to the rounded end of the forehead rest
stem (3 Fig 1). To adjust the stem, loosen the locking screw (2 Fig 1), slide the stem to
the required position as described in Method of Use and tighten the locking screw. The
adjustment allows for considerable variation in the size and shape of a subject's physical
features. The disc of the forehead rest should be cleaned regularly.
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continued
- continued
Fig 5b
en
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