– 9 – – 10 – – 11 –
– 13 – – 14 –
– 15 –
– 12 –
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
© 2023, Spectra Precision LLC. All rights reserved.
PN 1211-0200 Rev C (05/23)
– 9 – – 10 – – 11 –
– 13 – – 14 –
– 15 –
– 12 –
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.
Service Request
To locate your local dealer or authorized Spectra Precision
Service Center outside the U.S.A for service, accessories, or
spare parts, contact one of our offices listed below.
AL32A AL28A AL24A AL28M AL24M AL20M
Magnication 32X 28X 24X 28X 24X 20X
Dampening Air Air Air Magnetic Magnetic Magnetic
Accuracy* +/-1.0mm +/-1.5mm +/-2.0mm +/-1.5mm +/-2.0mm +/-2.5mm
Leveling Accuracy @
50m
0.5mm 0.7mm 1.2mm 2.5mm 2.5mm 2.5mm
Telescope:
Aperture 30mm (1.2 in.)
Telescope image Erect
Field of view angle
1⁰20'
Shortest focus distance 0.60m (1.97 ft.)
Stadia constant 100
Addition constant 0
Dimensions (L x W x H):
Instrument 103 x 190 x 135mm (5.2 x 7.5 x 5.3 in.)
Case 170 x 280 x 190mm (6.7 x 11 x 7.5 in.)
Weight:
Instrument 1.6 kg (3.5 lb)
Case 1.25kg (2.75 lb)
* Standard deviation according to DIN 18723 on 1 km of double leveling
Specifications
Americas
Spectra Precision (USA) LLC
3265 Logistics Lane, Suite 200
Dayton, OH 45377 USA
888-527-3771 (Toll Free)
Europe, Middle East, Africa
Spectra Precision (Kaiserslautern) GmbH
Am Sportplatz 5
67661 Kaiserslautern
Germany
+49-6142-2100-0 Phone
www.spectraprecision.com
Warranty
Spectra Precision LLC warrants the AL auto levels to be free of
defects in material and workmanship for a period of 2 years.
Spectra Precision LLC or its authorized service center will repair
or replace, at its option, any defective part, or the entire
product, for which notice has been given during the warranty
period. If required, travel and per diem expenses to and from
the place where repairs are made will be charged to the
customer at the prevailing rates. Customers should send the
product to the nearest authorized service center for warranty
repairs or exchange, freight prepaid. Any evidence of negligent,
abnormal use, accident, or any attempt to repair the product by
other than factory-authorized personnel using Spectra Precision
LLC certified or recommended parts, automatically voids the
warranty. Special precautions have been taken to ensure the
calibration of the laser; however, calibration is not covered by
this warranty. Maintenance of the calibration is the
responsibility of the user. The foregoing states the entire liability
of Spectra Precision LLC regarding the purchase and use of its
equipment. Spectra Precision LLC will not be held responsible
for any consequential loss or damage of any kind. This warranty
is in lieu of all other warranties, except as set forth above,
including any implied warranty merchantability of fitness for a
particular purpose, are hereby disclaimed. This warranty is in
lieu of all other warranties, expressed or implied.
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