Spectra AL28M-1 Laser Level User Manual


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Adjusting the Instrument
Circular Level
1. Set up the instrument.
2. Center the bubble of the circular level using the leveling
screws.
3. Turn the telescope 180° (200 gon).
4 Check to see whether the bubble is still centered in the circle.
Ifitisn’t,eliminateonehalfoftheerrorwiththeleveling
screws and the other half with the two adjustment screws for
the circular level.
5. Repeat the process until the bubble remains centered when
the instrument is turned.
Taking an Angle Measurement
1. Set up the tripod so that it is over a hub.
Note: Make sure the tripod is stable and the tripod head is
relatively level.
2.Hangaplumb-bobfromtheplumb-bobhookonthetripod.
Note:Makesuretheplumb-bobisoverthehub.
3.Attachtheinstrumenttothetripod.
4.Centertheplumb-boboverthepininthehubbyvarying
the length of the tripod legs or by shifting the instrument
on the tripod.
5.Accuratelyalignthetelescopetothefirsttargetusingthe
sighting guides and a horizontal tangent knob.
Note: The first target is a known point.
6. Set the horizontal rotation ring to 0.
7.Accuratelyalignthetelescopetothesecondtargetandread
the angle.
Line of Sight
Service Request
To locate your local dealer or authorized Trimble Service Center
outsidetheU.S.Aforservice,accessories,orspareparts,contact
one of our offices listed below.
Trimble Construction Tools Division
8261 State Route 235
Dayton, Ohio 45424-6383
U.S.A.
+1-937-245-5600 Phone
N324
© 2010, Trimble Navigation Limited. All rights reserved.
Reorder PN 1211-0151B (05/10)
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4. Move the instrument and reset it up so that it is about 2 m
behind point B.
5. Take another reading at point B (b
2
= 1.462 m).
6.Addb
2
to d to get value c (1.462 + 1.487 = 2.949 m).
7.TakeanotherreadingatpointA(a
2
).
8. Compare value c (2.949) to a
2
.Ifthelineofsightiscorrect,
both numbers should be the same. If they differ by more than
4mm,resetthegraderodonpointAandturnthecrosshairs
adjustment screws (unscrew the cover to expose them) until
value c (2.949) is centered in the crosshairs.
Caution: The upper and lower adjustment screws are
counter-screwsandmustnotbesettootightly.
9. Repeat the process until the line of sight is correct
(c and a
2
are the same).
1.Setuptheinstrumenthalfwaybetweentwopoints(AandB)
that are 30 to 40 m apart.
2.TakeareadingatpointA(a
1
= 2.423 m) and another one at
point B (b
1
= 0.936 m).
3. Subtract b
1
from a
1
to get the difference between the points
(d = +1.487 m). Make sure you note whether value d is a
positive or negative number.
Note: Because the distance from the instrument to each of
thepointsisequal,thedifferenceinelevationiscorrecteven
if the line of sight is out of adjustment.
a
2
b
2
a
1
b
1
A
B
a
2
= 2.423 b
2
= 1.462
+b
1
= 0.936 -d
= 1.487
d
= +1.487 c
= 2.949
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For product recycling instructions and more information,
please go to: www.trimble.com/environment/summary.html
Recycling in Europe
To recycle Trimble WEEE, call: +31 497 53 2430, and ask for the ÒWEEE
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Specifications
AL24A / AL24M AL28A / AL28M / AL28M-G AL32A
Dimensions(LxWxH)
Instrument 130 x 190 x 135 mm 130 x 190 x 135 mm 130 x 190 x 135 mm
(5.1 x 7.5 x 5.3 in.) (5.1 x 7.5 x 5.3 in.) (5.1 x 7.5 x 5.3 in.)
Case 170 x 280 x 190 mm 170 x 280 x 190 mm 170 x 280 x 190 mm
(6.7 x 11.0 x 7.5 in.) (6.7 x 11.0 x 7.5 in.) (6.7 x 11.0 x 7.5 in.)
Weight
Instrument 1.6 kg (3.5 lb) 1.6 kg (3.5 lb) 1.6 kg (3.5 lb)
Case 1.25 kg (2.75 lb) 1.25 kg (2.75 lb) 1.25 kg (2.75 lb)
Accuracy
Standard deviation according to DIN +/–2.0 mm +/–1.5 mm +/–1.0 mm
18723 on 1 km of double leveling
Leveling accuracy 3 mm @ 46 m 1.5 mm @ 60 m 1.5 mm @ 75
(
1
/
8
in. @ 150 ft) (
1
/
16
in. @ 200 ft) (
1
/
16
in. @ 250 ft m)
Telescope
Magnification 24x 28x 32X
  Aperture 30mm(1.2in.) 30mm(1.2in.) 36mm(1.4in.)
Telescope image Erect Erect Erect
Field of view angle 1° 20' 1° 20' 1° 20'
Shortest focusing distance 0.60 m (1.97 ft) 0.60 m (1.97 ft) 0.60 m (1.97 ft)
Stadia constant 100 100 100
  Additionconstant 0 0 0
Automatic Compensator
  Type Wiresuspension: Wiresuspension: Wiresuspension:
  AL2XA,AL32A Airdamped Airdamped Airdamped
  AL2XM(-G) Magneticdamped Magneticdamped
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