9 CHECK AND ADJUSTMENT

9.3.4 Collimation of the Instrument

Collimation is required to make the line of sight of the telescope perpendicular to the horizontal axis of the instrument, otherwise, it will not be possible to extend a straight line by direct means.

l

Check

Eyepiece

1)

Set the instrument up with clear

 

 

 

 

 

 

 

sights of about 50 to 60meters

 

 

 

 

 

 

 

(160 to 200 ft.) on both sides of the

 

 

 

 

 

 

 

instrument.

 

 

 

 

 

 

2)

Level the instrument properly with the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

plate level.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3)Sight Point A at approximately 50 meters (160 ft.) distance.

Telescope

4) Rotate the telescope 180° or 200g around the horizontal axis, so that the telescope is pointed in the opposite direction.

5) Sight Point B, at equal distance as Point A.

6) Rotate the instrument 180° or 200g around the vertical axis. Fix a sight on Point A once more.

7)Rotate the telescope 180°

or 200g around the horizontal axis

once more and fix a sight on Point C, which should coincide with previous Point B.

8) If Points B and C do not coincide, adjust in the following manner.

lAdjustment

1)Unscrew the cross-hair adjustment section cover.

2)Find Point D at a point between Points C and B, which should

be equal to 1/4th the distance between Points B and C and measured from Point C. This is because the apparent error between Points B and C is four times the actual error since the telescope has been reversed twice during the checking operation.

3)Shift the vertical cross-hair line and coincide it with Point D, by revolving the left and right capstan adjustment screws with the adjusting pin.Upon completing the adjustment, repeat the checking operation once more.

If Points B and C coincide, further adjustment is not required. Otherwise, repeat the adjustment.

Capstan adjustment screws

Capstan adjustment screws

Eyepiece

9-7

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Topcon GTS-821A, GTS-822A, GTS-823A, GTS-825A instruction manual Collimation of the Instrument
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GTS-822A, GTS-825A, GTS-821A, GTS-822A, GTS-823A, GTS-825A, GTS-823A specifications

Topcon's GTS series of total stations, including the GTS-821A, GTS-822A, GTS-823A, and GTS-825A, are known for their robust features and exceptional precision, catering to the needs of surveying and construction professionals. These instruments blend advanced technology with user-friendly interfaces to enhance productivity in the field.

The GTS-821A model is designed for reliability and accuracy. It offers a measurement range of up to 1,000 meters and delivers precision within ±2 millimeters, making it ideal for jobs requiring fine detail. Key features include a high-speed angle measurement system and a dual-axis compensator that ensures accuracy on uneven terrain.

In contrast, the GTS-822A model takes performance a step further by incorporating advanced optical technologies. It includes a high-performance EDM (Electronic Distance Measurement) that allows for faster measurements with a range extending up to 2,000 meters. This model also integrates a clear display and simple user interface, facilitating easier operation for users of all skill levels.

The GTS-823A represents a perfect blend of portability and advanced functionality. It is lightweight, making it easy to transport between job sites. This model incorporates GPS capabilities, allowing seamless integration with GNSS systems for enhanced positioning accuracy. Its onboard software supports various surveying methods, making it versatile for different applications.

The GTS-825A stands out for its advanced features tailored for high-precision tasks. This model supports wireless communication, enabling real-time data transfer to smartphones and tablets, which enhances collaboration in fieldworks. With an impressive measurement capability, it extends the measurement range and precision, meeting the demands of large-scale projects.

All models in this series share a durable design reputation, ensuring they withstand harsh environmental conditions. Their user-friendly interfaces are complemented by robust software support, providing surveying professionals with the tools they need to optimize their workflows.

In summary, Topcon’s GTS series, including the GTS-821A, GTS-822A, GTS-823A, and GTS-825A, represent the cutting edge of surveying technology, boasting features like extended measurement ranges, high precision, advanced EDM, and GPS integration. These instruments not only enhance productivity but also ensure that professionals can achieve their surveying goals efficiently and effectively. Whether for routine land surveys or complex construction projects, the Topcon GTS series delivers exceptional performance and reliability.
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