Foif J2-2 User manual
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Suzhou FOIF Co., Ltd.
INSTRUCTION MANUAL
J2-2
Optical Theodolite
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Dear Customer:
Congratulations! We, FOIF are proud to present you with a J2-2
optical theodolite. Your theodolite is a rugged and reliable
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 have a dedicated service organization. If the
need arises, please don’t hesitate to call us.
Thank you for your trust and confidence.
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Product identification
The model and the serial number 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 service
workshop.
Type: ____________ Serial no.: ____________
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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
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Applications:
J2-2 optical theodolite is a kind of precision angle-measuring instrument. It plays a
very important orle in geodesic survey and engineering measurement, therefore it is
widely used in third-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 horizontal direction
measured
at face left and face right
±2″
Standard deviation in vertical angles
measured at
Face left and face right
±6″
Telescope
erect image
Clear objective aperture
40mm
Magnification
30×
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
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
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Nomenclature
9
1. objective 15. vertical clamp
2. illumination mirror 16. footscrew
3. press button 17. illumination mirror
4. cover 18. optical plummet
5. optical 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 knob
11. focusing sleeve 25. micrometer knob
12. adjustment screw 26. horizonatal clamp
13. plate level 27. carrying handle
14. Hz circle drive
·5·
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Telescope:
The telescope gives an erect image. The objective is constituted by a cemented
doublet and a separate lens. The eyepiece consists of a pair of symmetrical lenses.
This kind of construction gives excellent performance in image formation, brightness
and definition.
There are two optical sights on the top and the bottom of the telescope respectively
so that they are used for the initial pointing to a target in face left as well as face
right observations, when using electrical illumination 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 protective glass, should it be contaiminated, it can
still be cleaned without any harm to the reticle. After a left turn of the bayonet ring,
the eyepiece can be removed for exchange with another eyepiece.
Standing Axis
The standing axis system is of semi-kinemic type. The top of the axis bush is
cone-shaped and carries a ball bearings, the axis stem fits into the bush and is
centered in the ball bearing by the weight of the alidade, so that the play has little
effect on the verticality of axis.
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