Spectra Al24A Users Manual

AL28M-1 to the manual 478ef8c1-a1ce-4c1e-b2ac-b8a58b8cb283

2015-02-06

: Spectra Spectra-Al24A-Users-Manual-528184 spectra-al24a-users-manual-528184 spectra pdf

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Page Count: 2

Features
01. Focusing knob
02. Sighting guide
03. Crosshairs’ adjustment screws (under cover)
04. Crosshairs’ focusing ring
05. Eyepiece
06. Horizontal rotation ring and angle index
07. Leveling screws
08. Base plate
09. 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.
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.
Taking Measurements
Determining the Difference in Elevation
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).
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
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).
Computation Example
Elevation
Center Line Reading 1.294 m
Distance Measurement
Upper Stadia Line Reading 1.436 m
Lower Stadia Line Reading 1.152 m
Difference 0.284 m
Distance (0.284 x 100) 28. 4 m
– 2 – 3 – 4
5 6 7 – 8 –
7
5
4
8
13
12
10
11
9
3
6
2
1
1.Setuptheinstrumenthalfwaybetweentwopoints(AandB).
2.TakeareadingatpointA(a1 = 1.726 m) and another one at
point B (b1 =1.259 m).
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 b1 from a1 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.
1 5
1 4
1 3
1 2
1 1
1 0
AL 24/28/32 - A/M Series
Auto Levels
User Guide
www.trimble.com
a
1
b
1
A
B
1.259
1.726
0.467
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isnt,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)
www.trimble.com
– 9 – 10 – 11
13 14 15 –
– 12
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
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Europe
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AmPrimeParc11
65479 Raunheim
GERMANY
+49-6142-2100-0Phone
+49-6142-2100-550Fax
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Trimble Navigation Singapore PTE Ltd.
80MarineParadeRoad,#22-06
Parkway Parade
Singapore,449269
+65 6348 2212 Phone
+65 6348 2232 Fax
China
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Room2805-07,TengdaPlaza,
No. 168 Xiwai Street
Haidian District
Beijing,China100044
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+86 10 8857 7161 Fax
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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 (b2 = 1.462 m).
6.Addb2 to d to get value c (1.462 + 1.487 = 2.949 m).
7.TakeanotherreadingatpointA(a2).
8. Compare value c (2.949) to a2.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 a2 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(a1 = 2.423 m) and another one at
point B (b1 = 0.936 m).
3. Subtract b1 from a1 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.
a2b2
a1b1
A
B
a2 = 2.423 b2 = 1.462
+b1 = 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
associate,Ó or
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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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