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AT-B2/B3/B4

1. 27 1 PRECAUTIONS FOR SAFE For the safe use of the product and prevention of injury to operators and other persons as well as prevention of property damage items which should be observed are indicated by an exclamation point within a triangle used with WARNING and CAUTION statements in this instruction manual The definitions of the indications are listed below Be sure you understand them before reading the manual s main text Definition of Indication Ignoring this indication and A making an operation error WARNING could possibly result in death or serious injury to the operator Ignoring this indication and making an operation error A CAUTION could possibly result in minor injury or property damage This symbol indicates items for which caution hazard warnings inclusive is urged Specific details are printed in or near the symbol This symbol indicates items which are prohibited Specific details are printed in or near the symbol This symbol indicates items which must e always be performed Specific details are printed in or near the symbol 1 PRECAUTIONS FOR SAFE OPERATION GENERAL A WARNING Never look at the sun through the telescope Loss of eyesight could result Do not look at reflected sunlight from a prism or other reflecting object through the telescope Loss of eyesight could result When securing the instrument in the carrying case
2. 5m 8 2ft Resolving power 3 0 3 5 4 0 Minimum focus 0 3m 1ft Stadia ratio 1 100 Additive constant 0 Horizontal circle Diameter 103mm 4 1in Graduation 1 1gon Automatic compensator Range 15 Circular level Sensitivity 10 2mm Standard deviation for 1 km of double run leveling 0 7mm 1 5mm 2 0mm 0 03in 0 06in 0 08in With micrometer 0 5mm 0 02in Water resistance IPx6 1 60529 2001 Operating temperature 20 to 50 C 4 to 122 F range Storage temperature 40 to 70 C 40 to 158 F range 27 Size Width 130mm 5 12in Length 215mm 8 46in Height 140mm 135mm 5 51in 5 31in Weight 1 85kg 1 7kg 4 1 Ibs 3 7 Ibs 28 JSIMA This is the mark of the Japan Sur veying Instruments Manufacturers Association 75 1 Hasunuma cho Itabashi ku Tokyo 174 8580 Japan http www topcon co jp Please see the attached address list or the following website for contact addresses GLOBAL GATEWAY http global topcon com TROIS U CAOBBU eb XI 5 http www topcon co ip Raa At 7174 2580 xxm am 6 7174 8580 SEEDS REARS AIO BRITS CRA CHR y 7618 Mat R LN LV TH lt EW 2010 TOPCON CORPORATION ALL RIGHTS RESERVED
3. make sure that all catches including the side catches are closed Failure to do so could result in the instrument falling out while being carried causing injury CAUTION Do not use the carrying case as a footstool The case is slippery and unstable so a person could slip and fall off it Do not place the instrument in a case with a damaged catch or belt The case or instrument could be dropped and cause injury Do wield or throw the plumb bob person could be injured if struck 1 PRECAUTIONS FOR SAFE OPERATION TRIPOD AN CAUTION e ooe When mounting the instrument to the tripod tighten the centring screw securely Failure to tighten the screw properly could result in the instrument falling off the tripod causing injury Tighten securely the leg fixing screws of the tripod on which the instrument is mounted Failure to tighten the screws could result in the tripod collapsing causing injury Do not carry the tripod with the tripod shoes pointed at other persons A person could be injured if struck by the tripod shoes Keep hands and feet away from the tripod shoes when fixing the tripod in the ground A hand or foot stab wound could result Tighten the leg fixing screws securely before carrying the tripod Failure to tighten the screws could lead to the tripod legs extending causing injury 1 PRECAUTIONS FOR SAFE OPERATION STAFF AN WARNING Do not use under thunderous weather Q conditi
4. 4 TOPCON INSTRUCTION MANUAL AS L XJ AUTOMATIC LEVEL AT B2 B3 B4 FC10386 A011 01 4 TOPCON INSTRUCTION MANUAL AUTOMATIC LEVEL AT B2 B3 B4 Thank you for selecting the AT B2 B3 B4 Please read this instruction manual carefully before using this product Verify that all equipment is included ICF 8 STANDARD EQUIPMENT The specifications and general appearance of the instrument are subject to change without prior notice and without obligation by Topcon Corporation and may differ from those appear ing in this manual The content of this manual is subject to change without notice Illustrations appearing in this manual are of AT B2 Some of the diagrams shown in this manual may be simplified for easier understanding 5 PRECAUTIONS FOR SAFE OPERATION 1 PRECAUTIONS FEATURES OF AT B2 B3 B4 PARTS OF THE INSTRUMENT PRELIMINARIES 5 1 SETTING UP THE INSTRUMENT 5 2 FOCUSSING AND SIGHTING OR NM 6 OPERATION 6 1 MEASURING HEIGHT DIFFERENCE 13 6 2 MEASURING HORIZONTAL ANGLE 15 6 3 MEASURING DISTANCE USING THE STADIA LINES 16 7 CHECKS AND ADJUSTMENTS 17 7 1 CIRCULAR LEVEL 9 OPTIONAL ACCESSORIES 10 SPECIFICATIONS
5. culate b a2 a1 b1 If bz b2 the horizontal cross line is normal and no adjustment is necessary When b and be are different adjust the cross line as follows 19 7 CHECKS AND ADJUSTMENTS 3 Unscrew and remove the adjusting screw cover 4 Usethe adjusting pin to eliminate the difference between b and bz See 8 STANDARD In the example shown in step 2 bz is larger than bz The horizontal line needs to be lowered To lower the horizontal line carefully loosen the adjusting screw by a small amount using the adjusting pin To raise the horizontal line tighten the adjusting screw 5 Repeat steps 1 and 2 of the adjustment procedure until the difference between b2 and 6215 small 20 8 STANDARD EQUIPMENT AT B2 Packing layout O GQ N 2 3 4 8 7 6 5 Main unit 1 Plumb 1 Hexagonal wrench id Adjusting pin 02 Instruction manual 1 Vinyl COVER ize 1 Cleaning cloth 4 Lens 1 21 Case SE35A 8 STANDARD EQUIPMENT AT B3 B4 Packing layout O GQ N 7 56 Main 1 Plumb bob ii
6. d Hexagonal wrench d Adjusting pin mL Instruction manual 1 Vinyl cover 1 Cleaning cloth 1 1 22 m B WR E AP 9 OPTIONAL ACCESSORIES ILLUMINATION PACK LA8 AT B2 only The illumination pack is available for use when leveling in low light conditions Brightness 1 Slide it onto the telescope as far as it will go The lens hood should be retracted 2 Switch the unit on and adjust the brightness using the knob OPTICAL MICROMETER 5 AT B2 only The detachable optical micrometer 5 is available for high precision leveling Turning the micrometer knob shifts the line of sight of the telescope vertically a maximum of 10 mm This micrometer shift can be displayed in 0 1 mm graduations Minimum sighting distance 1 m Use first order staves with 1 cm graduations or similar precision staves 23 9 OPTIONAL ACCESSORIES Micrometer knob Locking lever Micrometer eyepiece 1 Mount the OMS on the telescope of the AT B2 push the locking lever fully forward to lock it The lens hood should be retracted 2 the micrometer knob to move the line of sight until the graduation mark on the staff comes to the middle point between the two wedge reticle lines for an accurate reading 3 Take the micrometer reading in the micrometer eye
7. el Turn the instrument 180 or 200 gon If the bubble is inside the circle no adjustment is necessary If the bubble shifts from within the circle adjust as follows 3 Compensate for one half of the shift by adjusting the leveling foot screws 1 2 Leveling foot Screws Eliminate the remaining half shift with the circular level adjusting screws using the hexagonal wrench Turn the instrument 180 or 200 gon If the bubble ene remains in the circle adjustment is complete 17 7 CHECKS AND ADJUSTMENTS 7 2 AUTOMATIC COMPENSATOR 1 Center the bubble in the circular level 2 While turning the nearest leveling screw to the sighting axis 1 8 of a turn to the right or left check the movement of the horizontal cross line Another method is to tap the tripod legs or the main body while sighting a clear target t Line of sight If the automatic compensator mechanism is working normally the cross line should bounce then immediately return to the original position It is advisable to check the movement of the automatic compensator before use 18 7 CHECKS AND ADJUSTMENTS 7 3 RETICLE CROSS LINE LINE OF SIGHT Setthe instrument halfway between two points A and B 30 to 50m apart Take readings and 2 Setthe instrument at a point 2 m from point A Take readings a2 and 02 Leave the telescope sighted on point B Cal
8. lar triangle on the ground 4 Make sure that the tripod head is approximately level Fix the tripod shoes firmly into the ground 5 PRELIMINARIES 5 Hold the instrument on the tripod head and tighten the centering screw Spherical head tripod Centering screw 6 when using the spherical head tripod slightly loosen the centering screw hold the base plate in both hands and slide it across the tripod head until the bubble is in the proximity of the circular level Z Tighten the centering screw 8 Adjust the leveling foot screws until the bubble is exactly centered in the center circle 10 5 PRELIMINARIES 5 2 FOCUSSING AND SIGHTING 1 Use the peep sight or gun sight to point the objective lens at the target 2 Gradually turn the eyepiece until just before the reticle cross line becomes blurred 3 Use the horizontal fine motion screw to center the target in the field of view Turn the focussing knob to focus on the target Focussing is coarse while the AT B2 focussing knob feels heavy to rotate Rotating in the reverse direction less heavy will give a fine focussing motion 4 Looking through the telescope shift your eyes slightly in the horizontal and vertical directions 11 5 PRELIMINARIES 5 If there is parallax between the target image and the reticle preparations for measurement are complete If there is parallax repeat the above proced
9. ng the circular level the line of sight is accurately leveled by the automatic compensating mechanism The AT B2 B3 B4 has been designed to allow stable surveying operations regardless of environmental conditions such as vibration and temperature changes The AT B2 B3 B4 has a simple horizontal circle for angle measurement and the stadia lines on the reticle can be used for approximate distance measurement The AT B2 B3 B4 is ideally suited for general survey work civil engineering and construction work The instrument is accurately leveled when the bubbleis within the center circle of the circular level 4 PARTS OF THE INSTRUMENT Instrument shown AT B2 Lens hood AT B2 only Prism AT B2 Reflector AT B3 B4 Peep sight Circular level adjusting screw Circular level Leveling foot screw Base plate Horizontal fine motion screw Objective lens 10 Focussing knob 11 Horizontal circle positioning ring 12 Horizontal circle window 13 Reticle adjusting screw cover 14 Eyepiece 2 1 The has gun sight The AT B2 eyepiece is detachable 8 LO Op 5 PRELIMINARIES 5 1 SETTING UP THE INSTRUMENT 1 Unbuckle the band around the tripod legs and loosen the extension clamp screws 2 With the tripod closed extend the tripod legs until the tripod head is roughly at eye level then re tighten the clamp screws 3 Spread the tripod legs so that the leg tips form a regu
10. nt periodically to maintain the instrument accuracy 2 PRECAUTIONS EXCEPTIONS FROM RESPONSIBILITY The user of this product is expected to follow all operating instructions and make periodic checks hardware only of the product s performance The manufacturer or its representatives assumes no responsibility for results of a faulty or intentional usage or misuse including any direct indirect consequential damage and loss of profits The manufacturer or its representatives assumes no responsibility for consequential damage and loss of profits due to any natural disaster earthquake storms floods etc fire accident or an act of a third party and or a usage under unusual conditions The manufacturer or its representatives assumes no responsibility for any damage and loss of profits due to a change of data loss of data an interruption of business etc caused by using the product or an unusable product The manufacturer or its representatives assumes no responsibility for any damage and loss of profits caused by usage different to that explained in the instruction manual The manufacturer or its representatives assumes no responsibility for damage caused by incorrect operation or action resulting from connection to other products 3 FEATURES OF AT B2 B3 B4 The AT B2 B3 B4 is equipped with a fast action magnetically damped automatic compensator After the instrument has been approximately leveled usi
11. ons Staff is conductive and if struck by lightning death or injury could result Handle with care when using near high voltage cables or transformers Staff is conductive and contact could result in electric shock 2 PRECAUTIONS GENERAL The AT B2 B3 B4 is a precision instrument Handle with care and avoid heavy shocks and vibration Never place the instrument directly on the ground When the instrument is left on the tripod cap the objective lens and cover the entire instrument with the vinyl cover provided When the instrument is placed in the case store the accessories in their specified places MAINTENANCE Wipe off moisture completely if the instrument gets wet during survey work Always clean the instrument before returning it to the case The lens requires special care Dust it off witha clean cloth first to remove tiny particles Then after providing a little condensation by breathing on the lens wipe it with a soft clean cloth or lens tissue To clean the instrument or carrying case lightly moisten a soft cloth in a mild detergent solution Wring out excess water until the cloth is slightly damp then carefully wipe the surface of the unit Do not use any organic solvents or alkaline cleaning solutions Check the tripod for loose fit and loose screws If any trouble is found on the rotatable portion screws or optical parts e g lens contact your local dealer Check the instrument for proper adjustme
12. piece One division corresponds to 0 1 mm 4 Adding the micrometer reading to the staff graduations reading gives the measurement value 24 9 OPTIONAL ACCESSORIES Example Staff graduation 152 cm Micrometer 8 7 mm 152 87 cm 9 For accurate measurement the last adjustment of the micrometer knob should be in the clockwise direction DIAGONAL EYEPIECE DE16 DE22 The diagonal eyepiece DE16 DE22 is available for use in restricted viewing positions n Qr DE16 for AT B2 DE22 for AT B3 B4 1 To attach the DE16 remove the eyepiece by unscrewing to the left and screw in the diagonal eyepiece To attach the DE22 push it on to the reticle adjusting screw cover 2 Holding the base of the DE16 DE22 focus on the reticle by turning the eyepiece of the DE16 DE22 Perform focussing and sighting as described in 5 2 FOCUSSING AND SIGHTING 25 9 OPTIONAL ACCESSORIES The AT B2 detachable eyepiece can also be replaced by the optional 40x eyepiece EL5 REMOVABLE EYEPIECE EL5 AT B2 only Increases the standard 32X image to 40X 26 10 SPECIFICATIONS 2 AT B3 AT B4 Telescope Length 215mm 8 46 in Image Erect Objective aperture 42mm 36mm 32mm 1 65 1 42 in 1 26 in Magnification 32X 28X 24X Field of view 1720 1925 100m 328ft 2 3m 7 5ft 2
13. rmula is Altitude of the required point altitude of known point total of backsight values total foresight values This simple leveling technique has no error check It is better to measure from A to B and back to A so that the error of closure can be calculated 14 6 OPERATION 6 2 MEASURING HORIZONTAL ANGLE The horizontal circle graduations are annotated every 107 360 or 10 gon 400 gon in a clockwise direction As a result sighting is performed from left to right 1 Usethe plumb bob to set up the instrument directly above the survey point 2 Sight point A and set the horizontal circle to 0 by turning the horizontal circle positioning ring 10 3 Sight point B and take the angle reading Example 91 5 or 91 5 gon in the figure below 90 15 6 OPERATION 6 3 MEASURING DISTANCE USING THE STADIA LINES The stadia lines etched on the reticle can be used for distance measurements 1 Sight the staff and count the number of centimeters between the two stadia lines Cross lines Stadia lines 2 This number is equivalent to the distance in meters between the staff and the instrument Example If the length is 32 cm the horizontal distance from the instrument center A to the staff B is 32 m 16 7 CHECKS AND ADJUSTMEN 7 1 CIRCULAR LEVEL 1 2 Adjust the leveling foot Screws to center the bubble in the circular lev
14. ure from step 2 in order to refocus the reticle If there is parallax measurement errors may result so make sure to adequately focus the target Use the lens hood AT B2 only in strong light conditions 12 6 1 Set up the instrument at a point approximately halfway between points A and B The reticle stadia lines can be used to optically compare the distances See 6 3 MEASURING DISTANCE USING THE STADIA LINES For more accurate measurement set the instrument as close to halfway as possible to eliminate errors due to sighting axis misalignment oo A g 2 Position the staff vertically at point A Take the reading a backsight on the staff at point A 3 Then sight the staff at point B and obtain the reading b foresight 4 The difference a b is the height difference h of B from A Example hza b 1 735 1 224m 0 511m 13 6 OPERATION Therefore point B is 0 511m higher than point A The value of h will be negative if point B is lower than point A When the distance between points A and B is large or if the height difference is great Divide the distance into a number of sections and determine the height difference of each section 2 The height difference between points A and B is the total of the height differences of all the sections The general fo

AT-B2/B3/B4

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