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Foif J2-2, Instruction Manual

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Foif J2-2 Instruction Manual Download Page 6

6

Field of view at 1000m

24m

Shortest focusing distance

2m

Multiplication factor

100

Additive constant

0

Grass Circles

360°

Graduation diameter:
HZ circle

90mm

V circle

70mm

Graduation interval of HZ and V circles

20

′

Smallest interval of optical micrometer

1

″

Automatic Vertical Index
Setting accuracy

±0.3

″

Working range

±0.3

′

Reading Microscope
Magnification:
HZ system

48×

V system

62×

Bubble sensitivity per 2mm run

Summary of Contents for J2-2

Page 1: ...1 Suzhou FOIF Co Ltd INSTRUCTION MANUAL J2 2 Optical Theodolite...

Page 2: ...liable instrument whose performance and design are not surpassed To fully appreciate and protect your investment we suggest that you take the necessary time to read and fully understand this manual We...

Page 3: ...er of your product are indicated on the type plate Enter the model and the serial number in your manual and always refer to this information when you need to contact your agency or FOIF authorized ser...

Page 4: ...4 Contents Applications 1 Technical Data 1 Construction 3 Method of operation 8 Testing and Adjusting 17 Care of Instruments 23 Optional Accessories 24 Document 25...

Page 5: ...d order fourth order trainglulation building roadwork pipe playing trnnelling mining cadastral survey as well as machine tooling and installation etc Technical data Accuracy Standard deviation in hori...

Page 6: ...Grass Circles 360 Graduation diameter HZ circle 90mm V circle 70mm Graduation interval of HZ and V circles 20 Smallest interval of optical micrometer 1 Automatic Vertical Index Setting accuracy 0 3 Wo...

Page 7: ...7 Circular level 8 Plate level 20 Optical Plummet Magnification 3 Angular field of view 7 30 Focusing range 0 3 6m Weight Net weight 6kg Gross weight 9kg...

Page 8: ...8 Nomenclature...

Page 9: ...l sight 19 cover 6 level 20 circular bubble 7 bayonet ring 21 adjustment screw 8 adjustment screw 22 horizontal drive 9 eyepiece of microscope 23 vertical drive 10 eyepiece of telescope 24 change over...

Page 10: ...umination for night or underground work the light from the vertical circle plug in lamp is then reflectod off a mirror inside the telescope towards the reticle On the surface of the reticle is the pro...

Page 11: ...is employed as the micrometer The principle of the optical wedge micrometer is that when a single ray traverses the optical wedge it emerges in an angle to its original direction but with a lateral d...

Page 12: ...p correctly Method of Operation This instrument can be used with a three groove tribrach 1 Centring 1 1 Centring with the plumb bob Extend tripod legs so that instrument will be at comfortable height...

Page 13: ...cus Slacken tripod fixing screw and move instrument over tripod plate until cross hairs coincide with ground mark Turn the alidade through 180 and check centring Centring again and levelling again if...

Page 14: ...rtical clamp and drive must not be touched b Turn alidade through 180 Read vertical circle Compute the mean of the vertical circle readings taken in steps a and b Now set micrometer to give the minute...

Page 15: ...n focusing sleeve 11 until target is seen Set cross hairs close to target by turning sleeve until target image is sharp and free from parallax If there is parallax remove by adjusting the focusing sli...

Page 16: ...gh otherwise use single vertical hair splits the taget Turn the change over knob to its stop so that the white line on the knob is horizontal Open and turn the mirrors towards the light so that the fi...

Page 17: ...should be clockwise In the left or central part of the top window are seen the whole degree numbers Below this is the number for tens of minutes In the left part of the scale seen the numbers for min...

Page 18: ...inated The vertical circle is read in exactly the same way as the horizontal circle The vertical angle a and the index error i are calculated from a R L 180 2 i R L 360 2 R Reading at face right L Rea...

Page 19: ...scope objective until it reaches its stop The light from the vertical circle plug in lamp is then reflected off a mirror inside the telescope towards the reticle To prevent undue battery discharge whe...

Page 20: ...lockwise through 180 Note the position of the bubble Bring the bubble to a point halfway between this position and the central position by turning footscrew C Now with an adjusting pin carefully turn...

Page 21: ...measurement with J2 2 theodolite 2C of less 12 is usually acceptable To adjust The vertical hair is still on the target with the instrument in face left Turn the micrometer knob and set the correct va...

Page 22: ...22 the reverse will apply Turn the screws in this way by small and equal amounts until the vertical hair coincides with the target...

Page 23: ...el up instrument With instrument in face right bring horizontal hair onto a well defined target Take R reading repeat in face left and take L reading then the index error is determined as For example...

Page 24: ...the screw with a screw driver The adjustment is carried out by means of the capstan headed screw with an adjusting pin 5 Adjustment of optical plummet Level up the instrument Look through plummet foc...

Page 25: ...hand still holding the instrument attach by means of tripod fixing screw The fixing screw should not be covertighten Close the container 2 When not in use the instrument should be kept in the containe...

Page 26: ...er This helps to prevent mildew Optional accessories Plumb bob Optical plummet Adjusting pin Optical upward plumet Tripod Target plate Brush Pillar plate Screw driver Optical downward plummet Objectiv...

Page 27: ...ications resulting from technical developments may be made in the interest of our customers Thus illustrations specifications and catalogue references are not hinting and are subject to change without...

Page 28: ...28 Suzhou FOIF Co Ltd TEL 86 512 65224904 FAX 86 512 65230619 http www foif com cn or http www foif cn E mail internationalsales foif com cn ISO 9001 CERTIFICATED FIRM Certificate No QSC 5112...

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