LaserLiner AL 22 Classic, Руководство пользователя

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10 EN
B
A
½L ½L
2
Determination of a height difference
1. Place instrument halfway between
the positions of staves A and B.
Aim instrument at staff A and read
the value of the graduation of the
staff at your crosshairs (A = 140 cm).
Turn instrument towards rod B and
get the reading from the graduation
(B = 90 cm).
2. The difference (A-B) results in a
height difference H = +50 cm
between B and A. The point B is 50 cm higher than point A. The difference
H turns negative when point B is lower than point A.
Prior to its use, the instrument should be given time to adopt
the prevailing temperature of the area.
!
Remaining inclinations of the crosshairs which are left after the levelling
bubble has been centred will be eliminated by the compensator. The
compensator, however, will not eliminate any inclinations caused by
faulty calibration of the levelling bubble or the crosshairs. Therefore,
the positions of both gadgets should be checked before measuring
(see calibration).
!
A slight deviation of the crosshairs does not cause any misreadings
provided the instrument has been placed approx. midway between
the positions of the two staves A and B.
!
1
Alignment
1. Initial alignment of the telescope towards the graduated
staff is done by hand, using the iron sights.
2. Focus the image of the staff, by operating the focusing knob,
turn crosshairs onto the staff centre.
3. Make sure focusing is free of parallax. The focusing is alright when cross-
hairs and graduation of the staff don‘t change their positions even when
looked at from different angles (keep changing position of the eye in front
of the eyepiece).