Automatic Level
GL-332
INSTRUCTIONS FOR USE
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Contents
1. Technical Data............................................................................................02
2. Structure Focusing.....................................................................................03
3. Method of Operation..................................................................................06
3.1 Setting and Levelling................................................................................06
3.2 Aiming and Fousing..................................................................................06
3.3 Staff Reading............................................................................................07
4. Check and Adjusting..................................................................................08
4.1 Correct the parallelism for both circle bubble and Vertical axis...............08
4.2 Check and Adjusting for leveling of sight line of telescope......................09
5. Service and Maintance...............................................................................10
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1. Technical Data
Standard deviation of 1KM
double-run levelling
≤2.5mm
≤2.0mm
≤1.5mm
≤1.5mm
Telescope
Erect Erect Erect Erect
Magnification
20X 24X 28X 32X
Clear objective aperture
38mm 38mm 38mm 38mm
Field angle
1ﾟ20' 1ﾟ20' 1ﾟ20' 1ﾟ20'
Shortest focusing distance
0.6m 0.6m 0.6m 0.6m
Multiplication factor
100 100 100 100
Additive constant
0 0 0 0
Compensator working range
±15' ±15' ±15' ±15'
Compensator setting accurancy
±0.8" ±0.6" ±0.5" ±0.3"
Sensitivity of circular bubble
8' / 2mm
8' / 2mm
8' / 2mm
8' / 2mm
Graduation interval
1ﾟ 1ﾟ 1ﾟ 1ﾟ
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2. Structure Features
a. The telescope has system of erect internal focusing which can be used to obtain
reversed image by way of prism. It is of sealed type to prevent from dust, water
and steam.
b. All the optical parts are coated with transmissive and reflective films to reduce loss
in luminous energy.
c. Hair cross-spring suspension prism is used for the compensator, and the labyrinth
damper will stop the compensator within short time to raise efficiency.
d. The instrument matched with warning set so it can check the working situation of
compensator and the property of leveling.
e. Friction brake and the structure of whole circle micro-drive is used for instrument
horizontal micro-motion, which has the advantages of reliable in structure and easy
in operation.
f. Instrument (Fig.1) and (Fig.2)
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Fig 1
Focusing knob
Telescope
Objective
Endless horizontal
Foot screw
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Fig 2
Endless horizontal
Foot screw
Bubble observer
Eyepiece cover
Eyepiece
Adjusting screw
Graduation
Circular bubble
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3. Method of Operation
3.1 Setting and Levelling
a. To adjust tripod, and let the flat part of tripod in a leveling position, with its height
basically in the same line of the telescope and the operator's eyes.
b. To set the instrument on tripod, and to connect the instrument to the tripod with the
central screw.
c. With the help of leveling screw. Center the circular bubble exactly at the position.
3.2 Aiming and Focusing
a. To rotate eyepiece cover, observe through the eyepiece of the telescope, and let the
sight distance line in graduated scale clear.
b. To aim the staff by rough finder, to rotate the focusing hand wheel until sight of
staff clear (forward to far away, and backward to nearer), then to rotate the hand
wheel of endless horizontal micro-motion and let the sight of staff on center.
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3.3 Staff reading
a. When the instrument aiming at the staff, the
reading of the center line is the altitude. (Fig.3)
is 1.614m
b. To have the readings respectively for the upper
line and the lower, the distance from station
point to the staff will be（upper line
reading-lower line reading）×100. (Fig.3) is
（1.675–1.550）×100 = 12.5m
c. When the vertical hair in sight distance lines
aiming at object A, the indicating angle in dial
will be ∠AOB = α–β
Fig 3
Fig 4
0
A B a b
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4. Checking and adjusting
Before leaving the factory, each centerline is properly adjusted, the centerline is
properly adjusted, the centerlines may deviate from proper position after
transportation or long time operation. So to check and adjust the main centerlines is
necessary before measuring and surveying is field work.
4.1 Correct the parallelism for both circle bubble and vertical axis to set the
instrument on tripod, and to rotate leveling screws until bubble is centered. If to rotate
the instrument on 180ﾟ, the bubble remains centered, bubble position is correct,
otherwise if must be corrected in following way.
a. To rotate foot screw, enabling bubble to move centered, and it's movement will
behalf deviation from the total value.
b. To adjust the bubble adjusting screw, enabling bubble to move centered, and repeat
until the bubble does not move along with rotating of the instrument.
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4.2 Check and adjusting for leveling of sight
line of telescope (Check and adjusting angle)
select a check line about 45–60m on a even
ground, divide it on 3 parts with the same
length (Fig.5), staff on points B&C. Suppose the mean reading by the instrument at
point A is a1, b1; and the mean reading by the instrument at point D is a2, b2, if
Δ=(a2,-b2)–(a1-b1)≤±3mm the angle is within tolerance, otherwise the instrument
must by readjusted in the following way:
a. First to calculate Δ= (a2,–b2)–(a1–b1) suppose a3 = a2–Δ
b. The instrument remained at point D, aiming at staff B, to remove the eyepiece
cover you will see a reticle adjusting screw (Fig.6), remove the adjusting screw on
gradudted scale carefully with adjusting needle until the graduated scale center
A
B C D
a
4
’
a4
a
1
’
a1
a 2
a
2
’
a 3
a
3
’
Fig 5
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coincide with a3, then to close the eyepiece cover and to check and adjust in the
same way again.
5. Service and maintenance
a. The instrument must be avoided directly from
sunshine at working time to keep accuracy.
b. After finish survey each part of instrument must
be clean and mount into instrument box.
c. Whist off dust from optical eiement by soft hair
brush, soft paper specially used for cleaning glasses and soft leather. Do not touch lens by hand.
d. If there is any trouble in working or the instrument has been br–(Fig.6) oken, you
may return it to our factory or send it to qualified department to repair it. It is
forbidden to dismantle the instrument randomly.
e. The instrument must be stored in the room with acid climate, clean and good
ventilation.
Adjusting screw
Adjusting screw
Giant Precision Instrument Co., Ltd.
International sales dep.
No.69, Anhe Rd., Zhonghe Dist., New Taipei City, Taiwan (R.O.C.) Zip:23576
Tel: 886-2-2231-7282 Fax: 886-2-2231-7281
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