取扱説明書
Contents
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9. D 1 2 CORA 23 11 SE35 11 1 1 1 e ole 1 24 SOKKIA B20 B21 Automatic Level OPERATOR S MANUAL Thank you for selecting the B20 B21 Before using the instrument please read this opera tor s manual carefully Verify that all equipment is included See 11 STANDARD EQUIPMENT This specifications and general appearance of the instrument may be altered at any time and may differ from those appearing in brochures and this manual Some of the diagrams shown in this manual may be Ge for easier understanding e CONTENTS 1 PRECAUTIONS FOR SAFE OPERATION 1 1 1 GENERAL 2 1 2 TRIPOD eee 3 1 3 STAFF etc ooo 3 2 FEATURES OF B2o B2 1 Ge 4 3 PARTS OF THE INSTRUMENT ee 5 4 PRELIMINARIES Gooeeeeeceoeece 6 4 1 SETTING UP THE INSTRUMENT eeeeeeeeeeeeeeeeee 6 4 2 FOCUSSING AND SIGHTING eeeeeeeeeeeeeeeeeeeeeee 8 5 OPERATION weesen enee EE R
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11. O B20 B21 OT GE A 1 1 1 1 2 1 2
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14. Fig 3 1 Lens hood Sliding type Horizontal fine motion screw Reflector Objective lens Peep sight 2 speed focussing knob Circular level adjusting Horizontal circle positioning screw ring Circular level Horizontal circle window Leveling foot screw Reticle adjusting screw cover Base plate Eyepiece The B20 eyepiece is detachable GES 4 PRELIMINARIES 4 1 SETTING UP THE INSTRUMENT 1 Unbuckle the band around the tripod legs and loosen the extension clamp screws Fig 4 1 e Extension clamp screw Fig 4 1 2 With the tripod closed extend the tripod legs until the tri pod head is roughly at eye level then re tighten the clamp screws 3 Spread the tripod legs so that the leg tips form a regular triangle on the ground 4 Make sure that the tripod head is approximately level Fix the tripod shoes firmly into the ground Fig 4 2 5 Hold the instrument on the tripod head and tighten the centering screw Fig 4 3 p C7 CHE Spherical 1 head tripod Centering screw Fig 4 3 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 Fig 4 4 Fig 4 4 7 Tighten the centering screw 8 Adjust the leveling foot screws until the bubble is exactly centered in the c
15. JS DL GAR E 21 B20 B21 215mm 42mm 32 X 30 X 100m 20 2 3m 3 AIS SREB Bt 0 3m 0 0 3mm i 15 10 d m 1km 1 0mm 1 5mm 0 8mm 1 2mm JIS 4 130 D X 215 CD X 140 CH mm SS 1 8kg 4 1Ibs 22 10 1 2
16. QU 3 B21 V 9 Ge 3 1 O ER B20 5 4 4 1 1 4 1 2 3 4
17. B20 OUT 40 E 14 6 3 OMS OM5 H 5 10mm SS 0 1mm PE 1m 1cm m lt S 16 3 D 2 et
18. 6 1 LA8 LA8 SS Y irii SA 6 1 D 2 13 6 2 DE16 DE22 6 2 B2 DE22 1 B20 Eelst B21 D 14 2
19. bz a2 ai bi bz bz 19 3 7 7 4 11 bz b2 7 6 bz 8 7 8 5 1 2 20 8 1 2 3 KA 4 II AN o o 11 D
20. When the instrument is placed in the case store the accessories in their specified places 22 9 SPECIFICATIONS Telescope Length Image Objective aperture Magnification Field of view Resolving power Minimum focus Stadia ratio Additive constant Horizontal circle Diameter Graduation Automatic compensator Range Circular level Sensitivity B20 B21 215 mm 8 5 inch Erect 42 mm 1 7 inch 32x 30x 1 20 2 3 m at 100m 3 0 3 m 1ft from instrument center 1 100 0 103 mm 4 1 inch 1 or 1 gon 15 1072 mm Standard deviation for 1 km 1mile of double run leveling With micrometer Water resistance Size Weight Instrument 1 0 mm 1 5 mm 0 004 DV 0 006 ft 0 8 mm 1 2 mm 0 003 ft 0 005 ft IPX4 130 W x 215 D X 140 H mm 5 1 W x 8 5 D x 5 3 H inch 1 8 kg 4 1 Ibs 23 10 MAINTENANCE 1 2 3 4 5 6 7 Check the tripod for loose fit and loose screws 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 with a clean cloth first to remove tiny particles Then after provid ing 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 det
21. circle positioning ring Fig 5 4 10 0 354 ns pe Fig 5 4 3 Sight point B and take the angle reading Example 91 5 or 91 5 gon in Fig 5 5 below 100 90 gegen Fig 5 5 12 5 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 Fig 5 6 Cross lines Stadia lines Fig 5 6 2 This number is equivalent to the distance in meters between the staff and the instrument Example If the length g is 32 cm the horizontal distance from the instrument center A to the staff B is 32 m IS fe cm 6 OPTIONAL ACCESSORIES sold seperately 6 1 ILLUMINATION PACK LA8 The illumination pack LA8 is available for use when leveling in low light conditions Fig 6 1 Brightness SSI RU es Fig 6 1 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 14 6 2 DIAGONAL EYEPIECE DE16 DE22 The diagonal eyepiece DE16 DE22 is available for use in restricted viewing positions tim DE16 for B20 1 To attach the DE16 remove the eyepiece by unscrew ing to the left and screw in the diagonal eyepiece To attach the DE22 push it on to the reticle adjusting screw cover
22. 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 tri pod Failure to tighten the screws could lead to the tripod legs extending causing injury 1 3 STAFF A CAUTION Do not use under thunderous weather conditions Staff is con ductive 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 ar 2 FEATURES OF B20 B21 The B20 B21 is equipped with a fast action magnetically damped automatic compensator After the instrument has been approximately leveled using the circular level the line of sight is accurately leveled by the automatic compensating mechanism The B20 B21 has been designed to allow stable surveying operations regardless of environmental conditions such as vibration and temperature changes The B20 has a magnification of x32 and a standard deviation for 1 km 1mile of double run leveling of 1 0mm The B20 B21 has a simple horizontal circle for angle mea surement and the stadia lines on the reticle can be used for approximate distance measurement The B20 B21 is ideally suited for general survey work civil engineering and construction work 3 PARTS OF THE INSTRUMENT Instrument shown B21
23. 1 Set the instrument halfway between two points and B 30 to 50m apart Take readings ai and b14 Fig 7 5 Fig 7 5 2 Set the instrument at a point 2 m from point A Take read ings az and bz Fig 7 6 AL_2m B Fig 7 6 Leave the telescope sighted on point B Calculate bz az a1 b1 If b2 bz the horizontal cross line is normal and no adjustment is necessary When bz and bz are different adjust the cross line as follows 20 3 Unscrew and remove the adjusting screw cover Fig 7 7 4 Use the adjusting pin to eliminate the difference between b2 and bz See 11 STANDARD EQUIPMENT In the example shown in Fig 7 6 bz is larger than bz The hori zontal 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 Fig 7 8 N NN Fig 7 8 5 Repeat steps 1 and 2 of the adjustment procedure until the difference between b and bzis small 21 8 GENERAL PRECAUTIONS 1 The B20 B21 is a precision instrument Handle with care and avoid heavy shocks and vibration 2 Never place the instrument directly on the ground 3 When the instrument is left on the tripod cap the objective lens and cover the entire instrument with the vinyl cover provided See 11 STANDARD EQUIPMENT 4
24. E EE Een 10 5 1 MEASURING HEIGHT DIFFERENCE lt ee 10 5 2 MEASURING HORIZONTAL ANGLEeeeeeeeeeeeceee 12 5 3 MEASURING DISTANCE USING THE STADIA LINES ceccccecccccccccccccccccesccccecccee 13 6 OPTIONAL ACCESSORIES ee ee 14 6 1 ILLUMINATION PACK LAB lt lt cooeoooee 14 6 2 DIAGONAL EYEPIECE DE16 DE22eeeeeeeeeeeeeeee 15 6 3 OPTICAL MICROMETER OMB eeeeeeeeeeeeeeeeeeeee 16 7 CHECKS AND ADJUSTMENTS eeeeeeeeeeeeeeeee 18 7 1 CIRCULAR LEVEL sesseeseesecsecsecsecoesoesoesoeso 18 7 2 AUTOMATIC COMPENSATOR eeeeeeeeeeeeeeeeeeeee 19 7 3 RETICLE CROSS LINE LINE OF SIGHT ey 20 8 GENERAL PRECAUTIONS vecsscccccscccccccceee 22 9 SPECIFICATIONS ceccesccccsccccccccccccccccccscccese 23 10 MAINTENANCE eceececcccccccccccccccccccccccccccccccccs 24 11 STANDARD EQUIPMENT Packing layout D sen ados toc ess ose ess 25 1 PRECAUTIONS FOR SAFE OPERATION For the safe use of the product and prevention of injury to oper ators and other persons as well as prevention of property dam age items which should be observed are indicated by an exclamation point within a triangle used with WARNING and CAUTION statements in this operator s 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 making an ANWARNING operation error could possibly result in death or serious injur
25. SOKKIA B20 B21 Automatic Level OPERATOR S MANUAL JSIMA ch 1 JSIMA EN AY CORIEGHERU ELAS JSIMA This is the mark of the Japan Surveying Instruments Manufacturers Association 2 31 7 158 0097 TEL 03 6684 0846 FAX 03 6684 0941 F http www sokkia co jp 260 63 T 243 0036 SOKKIA TOPCON CO LTD http www sokkia co jp english 260 63 HASE ATSUGI KANAGAWA 243 0036 JAPAN PHONE 81 46 248 7984 FAX 81 46 247 1731 SB 3 hz 05 0806 2004 3rd ed 05 0806 Printed in China 2004 SOKKIA TOPCON LTD SOKKIA O B20 B21
26. d 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 4 2 FOCUS SING AND SIGHTING The B20 detachable eyepiece can also be replaced by the optional 40x eyepiece and the optional auto collimation eyepiece 15 6 3 OPTICAL MICROMETER OM5 The detachable optical micrometer OM5 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 preci sion staves Micrometer knob Locking lever Th Micrometer Ao Release eyepiece Fig 6 3 1 Mount the OM5 on the telescope of the B20 B21 and push the locking lever fully forward to lock it The lens hood should be retracted 2 Turn 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 read ing as shown in Fig 6 4 16 3 Take the micrometer reading in the micrometer eyepiece One division corresponds to 0 1 mm 4 Adding the micrometer reading to the staff graduations reading gives the measurement value cm reading Fig 6 4 Example Staff graduation 152 cm Micrometer 87mm 152 87 cm For accurate mea
27. enter circle Fig 4 5 Fig 4 5 4 2 FOCUSSING AND SIGHTING 1 Use the peep sight to point the objective lens at the target 2 Gradually turn the eyepiece until just before the reticle cross line becomes blurred Fig 4 6 Use the lens hood in strong light condi tions 3 Use the horizontal fine motion screw to center the target in the field of view Turn the 2 speed focussing knob to focus on the target Fig 4 7 Focussing is coarse while the focus sing 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 5 If there is no parallax between the tar get image and the reticle preparations for measurement are complete If there is parallax repeat the above proce dure from step 2 in order to refocus the reticle X If there is parallax measurement errors may result so make sure to ade quately focus the target 5 OPERATION 5 1 MEASURING HEIGHT DIFFERENCE 1 2 3 4 Set up the instrument at a point approximately halfway between points A and B Fig 5 1 The reticle stadia lines can be used to optically compare the distances See 5 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 misali
28. ergent 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 Store the instrument in a dry room where the temperature remains fairly constant 24 11 STANDARD EQUIPMENT Packing layout d Case SE35 Fig 11 1 Plumb bob eeeeeeeeeeeee 1 Vinyl COVES eeeeeee 1 Hexagonal wrench 1 Cleaning cloth lt 1 Adjusting pin eeeee coo 2 21 Lens cap cocoeeeeeeeeeeee 1 Operator s manual 1 25 MEMO 26 MEMO 27 MEMO 28
29. gnment A B Fig 5 1 Position the staff vertically at point A Take the reading a backsight on the staff at point A Then sight the staff at point B and obtain the reading b foresight The difference a b is the height difference h of B from A Example h a b 1 735m 1 224m 0 511m 10 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 lt When the distance between points A and B is large or if the height difference is great gt 1 Divide the distance into a number of sections and deter mine the height difference of each section Fig 5 2 2 The height difference between points A and B is the total of the height differences of all the sections The general formula is Altitude of the required point altitude of known point total of backsight values total of 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 11 5 2 MEASURING HORIZONTAL ANGLE The horizontal circle graduations are annotated every 10 360 or 10 gon 400 gon in a clockwise direction As a result sighting is performed from left to right 1 Use the plumb bob to set up the instrument directly above the surveying point Fig 5 3 Fig 5 3 2 Sight point A and set the horizontal circle to 0 by turning the horizontal
30. surement the last adjustment of the micrometer knob should be in the clockwise direction 17 7 CHECKS AND ADJUSTMENTS 7 1 CIRCULAR LEVEL 1 2 3 4 5 Adjust the leveling foot screws to center the bubble in the circular level Turn the instrument 180 or 200 gon Fig 7 1 If the bubble is inside the circle no adjustment is necessary If the bubble shifts from within the circle adjust as follows Compensate for one half of the shift by adjusting the leveling foot screws Fig 7 2 Eliminate the remaining half shift with the circular level adjusting screws using the hexagonal wrench Fig 7 3 Turn the instrument 180 or 200 gon If the bubble remains in the circle adjustment is com plete 18 Leveling foot screws Fig 7 3 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 immedi ately return to the original position It is advisable to check the movement of the auto matic compensator before use 19 7 3 RETICLE CROSS LINE LINE OF SIGHT
31. y to the operator Ignoring this indication and making an AN caution operation error could possibly result in personal injury or property damage 1 1 GENERAL WARNING Never look at the sun through the telescope Loss of eye sight 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 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 A CAUTION Do not use the carrying case as a footstool The case is slip pery 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 not wield or throw the plumb bob A person could be injured if struck 1 2 TRIPOD A CAUTION When mounting the instrument to the tripod tighten the cen tring 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
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