Spectra AL24A User's Manual
Contents
1. AL 24 28 32 A M Series Auto Levels User Guide Gt Lig E 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 oe Trimble Features Taking Measurements Determining the Difference in Elevation oO P N 2 Take a read2. e 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 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 Attach the instrument to the tripod Oo 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 Specifications AL24A AL24M Dimensions L x W x H 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 6 7 x 11 0 x 7 5 in 6 7 x 11 0 x 7 5 in Weight 1 6 kg 3 5 Ib 1 6 kg 3 5 Ib 1 25 kg 2 75 Ib 1 25 kg 2 75 1b Accura Standard deviation according to DIN 2 0 mm 18723 on 1 km of double leveling isin 150 8 in t Telescope Magnification 24x 30 mm 1 2 in 30 mm 1 2 in Adjusting the Instrument Circular Level l oF Set up the instrument Center the bubb
3. ers 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 Repeat the process until the line of sight is correct c and a 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 OWEEE associate O or mail a request for recycling instructions to Trimble Europe BV c o Menlo Worldwide Logistics Meerheide 45 5521 DZ Eersel NL Trimble Trimble Construction Tools Division 8261 State Route 235 Dayton Ohio 45424 6383 U S A 1 937 245 5600 Phone www trimble com C n24 2010 Trimble Navigation Limited All rights reserved Reorder PN 1211 0151B 05 10
4. ght of the grade rod until the calculated difference 1 25 is centered in the crosshairs Maintenance and Care e As with all precision instruments the auto level should be transported and stored in its carrying case e When carrying the instrument mounted to a tripod be sure to carry it vertically rather than over your shoulder e Whenever possible store the instrument in a dry shady area e 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 e 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 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 Exampl
5. ing at point A a 1 726 m and another one at point B b 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 b from a 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 af Set up the instrument half way between two points A and B Focusing knob Sighting guide Crosshairs adjustment screws under cover Crosshairs focusing ring Eyepiece Horizontal rotation ring and angle index Leveling screws Base plate Circular level adjustment screws Horizontal tangent knob OO ON WB WN BK DW N e Circular level NO Mirror for reading circular level Objective Oo a oe 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 hei
6. le of the circular level using the leveling screws Turn the telescope 180 200 gon 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 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 1b 1 25 kg 2 75 1b 1 5 mm 1 0 mm 1 5 mm 60 m 1 16 in 200 ft 1 5 mm 75 1 16 in 250 ft m 28x 32X 36 mm 1 4 in Erect Field of view angle 1 20 Shortest focusing distance 0 60 m 1 97 ft Stadia constant 100 Automatic Compensator Wire suspension Air damped Magnetic damped 3 0 60 m 1 97 ft 0 60 m 1 97 ft 100 poo Wire suspension Air damped Magnetic damped Wire suspension Air damped 44 Line of Sight a 2 423 b 0 936 d 1 487 d 1 487 c 2 949 b gt 1 462 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 2 423 m and another one at point B b 0 936 m 3 Subtract b from a 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 dista
7. nce 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 i 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 Asia Pacific Trimble Construction Tools Division 8261 State Route 235 Dayton Ohio 45424 6383 80 Marine Parade Road 22 06 Parkway Parade Trimble Navigation Singapore PTE Ltd 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 amp Middle East Trimble Export Middle East PO Box 17760 JAFZ View Dubai UAE 97 1 4 881 3005 Phone 97 1 4 881 3007 Fax Europe Trimble GmbH Am Prime Parc 11 65479 Raunheim GERMANY 49 6142 2100 0 Phone 49 6142 2100 550 Fax 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 CON A YV Move the instrument and reset it up so that it is about 2 m behind point B Take another reading at point B b 1 462 m Add b to d to get value c 1 462 1 487 2 949 m Take another reading at point A a Compare value c 2 949 to a If the line of sight is correct both numb
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