Spectra AL24A User guide

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Spectra AL24A User guide | Manualzz

AL 24/28/32 - A/M Series

Auto Levels

User Guide

Features

13

12

11

10

9

1

2

3

4

5

6

7

8

0 1. Focusing knob

0 2. Sighting guide

0 3. Crosshairs’ adjustment screws (under cover)

0 4. Crosshairs’ focusing ring

0 5. Eyepiece

0 6. Horizontal rotation ring and angle index

0 7. Leveling screws

0 8. Base plate

0 9. Circular level adjustment screws

10. Horizontal tangent knob

11. Circular level

12. Mirror for reading circular level

13. Objective

Maintenance and Care

• As with all precision instruments, the auto level should be transported and stored in its carrying case.

• When carrying the instrument mounted to a tripod, be sure to carry it vertically rather than over your shoulder.

• Whenever possible, store the instrument in a dry, shady area.

• Wipe the instrument clean with a cloth. Clean the objective and eyepieces with special care using a damp tissue or soft, clean, lint-free cotton cloth.

• When working in wet weather, wipe off the instrument and carrying case in the field and let them dry completely indoors with the case open.

Safety Information

Included in this manual are Cautions and Notes. Each of these words represents a level of danger or concern. A Caution indicates a hazard or unsafe practice that could result in

minor injury or property damage. A Note indicates important information unrelated to safety.

www.trimble.com

How to Use the Instrument

Setting Up the Instrument

1. Set up the tripod at a height appropriate for your use.

Note: Make sure the tripod is stable and the tripod head is relatively level.

2. Attach the instrument to the tripod.

3. Level the instrument using the circular level as a reference.

4. Focus the telescope crosshairs by turning the crosshairs’ focusing ring.

Aligning the Instrument

1. Align the telescope to the grade rod using the sighting guides.

2. Turn the focusing knob to bring the grade rod into sharp focus. Precisely sight the center of the grade rod in the telescope crosshairs using the horizontal tangent knob.

3. Check for parallax shift.

Note: No parallax exists if the crosshairs and the grade rod graduations remain in coincidence even when you change your viewing angle (move your eye up/down and left/right in front of the eyepiece).

Note: After the bubble in the circular level has been centered, the compensator corrects residual line-of-sight inclinations.

The compensator does not, however, eliminate any tilts resulting from inadequate adjustment of the circular level or line of sight. These must be checked regularly (see Adjusting the Instrument for more information).

– 5 –

– 2 –

Taking Measurements

Determining the Difference in Elevation a

1 b

1

B

A

1. Set up the instrument half way between two points (A and B).

2. Take a reading at point A (a

=1.259 m).

1

= 1.726 m) and another one at point B (b

1

Note: A slight deviation of the line of sight from horizontal will not cause any measuring error as long as the instrument is set up approximately half way between the two points.

3. Subtract b

1

from a

1

to get the difference between the points

(d = 0.467 m).

Note: Point B is 0.467 higher than point A because the difference is a positive number. If point B were lower than point A, the number would be negative.

– 6 –

– 3 –

Establishing an Elevation

1. Set up and level the instrument.

2. Set the grade rod on a known elevation (30.55 m) and take a grade rod reading (1.72 m).

3. Add the grade rod reading to the known elevation to get the height of instrument or HI (1.72 + 30.55 = 32.27 m).

4. Subtract the elevation of the point you want to establish

(31.02 m) from the HI (32.27) to calculate the difference between the two points (32.27 – 31.02 =1.25 m).

5. Go to the point you want to establish and adjust the height of the grade rod until the calculated difference (1.25) is centered in the crosshairs.

– 4 –

Taking a Distance Measurement

Note: The instrument’s stadia lines allow you to determine the distance between the instrument and the grade rod.

1. Take readings at the upper stadia line (1.436 m) and the lower stadia

15

14 line (1.152 m).

2. Calculate the difference between the two readings (1.436 – 1.152 =

0.284 m).

3. Multiply the difference by 100 to get the distance between the instrument and the grade rod

(.284 x 100 = 28.4).

13

12

11

10

Computation Example

Elevation

Center Line Reading

Distance Measurement

Upper Stadia Line Reading

Lower Stadia Line Reading

Difference

Distance (0.284 x 100)

1.294 m

1.436 m

1.152 m

0.284 m

28. 4 m

– 7 – – 8 –

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.

– 9 –

Specifications

Dimensions (L x W x H)

Instrument

Case

Weight

Instrument

Case

Accuracy

Standard deviation according to DIN

18723 on 1 km of double leveling

Leveling accuracy

Telescope

Magnification

Aperture

Telescope image

Field of view angle

Shortest focusing distance

Stadia constant

Addition constant

Automatic Compensator

Type

AL2XA, AL32A

AL2XM (-G)

– 13 –

AL24A / AL24M

130 x 190 x 135 mm

(5.1 x 7.5 x 5.3 in.)

170 x 280 x 190 mm

(6.7 x 11.0 x 7.5 in.)

1.6 kg (3.5 lb)

1.25 kg (2.75 lb)

+/–2.0 mm

3 mm @ 46 m

( 1 /

8

in. @ 150 ft)

24x

30 mm (1.2 in.)

Erect

1° 20'

0.60 m (1.97 ft)

100

0

Wire suspension:

Air damped

Magnetic damped

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.

– 10 –

AL28A / AL28M / AL28M-G AL32A

130 x 190 x 135 mm

(5.1 x 7.5 x 5.3 in.)

170 x 280 x 190 mm

(6.7 x 11.0 x 7.5 in.)

1.6 kg (3.5 lb)

1.25 kg (2.75 lb)

+/–1.5 mm

1.5 mm @ 60 m

( 1 /

16

in. @ 200 ft)

28x

30 mm (1.2 in.)

Erect

1° 20'

0.60 m (1.97 ft)

100

0

Wire suspension:

Air damped

Magnetic damped

130 x 190 x 135 mm

(5.1 x 7.5 x 5.3 in.)

170 x 280 x 190 mm

(6.7 x 11.0 x 7.5 in.)

1.6 kg (3.5 lb)

1.25 kg (2.75 lb)

+/–1.0 mm

1.5 mm @ 75

( 1 /

16

in. @ 250 ft m)

32X

36 mm (1.4 in.)

Erect

1° 20'

0.60 m (1.97 ft)

100

0

Wire suspension:

Air damped

– 14 –

Line of Sight a

2 b

2 a

1 b

1

B

A a

2

= 2.423 b

2

= 1.462

+b

1

= 0.936 -d = 1.487

d = +1.487 c = 2.949

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 point B (b

1

= 2.423 m) and another one at

3. Subtract b

1

= 0.936 m).

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.

– 11 –

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.

North-Latin America

Trimble Construction Tools Division

8261 State Route 235

Dayton, Ohio 45424-6383

U.S.A.

(800) 538-7800

(Toll Free in U.S.A.)

+1-937-245-5600 Phone

+1-937-233-9004 Fax www.trimble.com

Africa & Middle East

Trimble Export Middle-East

P.O. Box 17760

JAFZ View, Dubai

UAE

+971-4-881-3005 Phone

+971-4-881-3007 Fax

Europe

Trimble GmbH

Am Prime Parc 11

65479 Raunheim

GERMANY

+49-6142-2100-0 Phone

+49-6142-2100-550 Fax

Asia-Pacific

Trimble Navigation Singapore PTE Ltd.

80 Marine Parade Road, #22-06

Parkway Parade

Singapore, 449269

+65 6348 2212 Phone

+65 6348 2232 Fax

China

Trimble Beijing

Room 2805-07, Tengda Plaza,

No. 168 Xiwai Street

Haidian District

Beijing, China 100044

+86 10 8857 7575 Phone

+86 10 8857 7161 Fax www.trimble.com.cn

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

6. Add b

2

7. Take another reading at point A (a

2

2

= 1.462 m).

to d to get value c (1.462 + 1.487 = 2.949 m).

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).

Notice to Our European Union Customers

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 associate,Ó or mail a request for recycling instructions to:

Trimble Europe BV c/o Menlo Worldwide Logistics

Meerheide 45

5521 DZ Eersel, NL

– 12 –

Trimble Construction Tools Division

8261 State Route 235

Dayton, Ohio 45424-6383

U.S.A.

+1-937-245-5600 Phone www.trimble.com

N324

© 2010, Trimble Navigation Limited. All rights reserved.

Reorder PN 1211-0151B (05/10)

– 15 –

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