2 PREPARATION FOR MEASUREMENT

2.11 Inclination of Prism and Measuring Error

For the best results, aim or point prisms in the direction of the GTS-820A series so that maximum signal can be returned to the instrument. Sighting prism obliquely because of inclined settings, may result in measuring errors. These errors will be proportional to the misalignment as showing in following graphs. The more misalignment of the prism, the more error in measurement.

Measured data can be different according to the prism constant value. This can occur when a prism is moving. Pin-pole prism set L1 (for one-person surveying) and pin-pole prism holder L1 (for fixed point observation) are designed to minimize measuring error in such case. Make the best use of them. In case you are forced to use the normal prism in inclined state because there is no other way possible, we recommend to use switching holder, prism constant value (0 or 30mm), and set to 30mm (Compensation value of -30mm).

Prism constant value : 0mm

Prism

Inclined angle

Instrument point

Measuring point

Prism constant value : 30mm

Inclined angle

2-10

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Topcon GTS-823A, GTS-825A Inclination of Prism and Measuring Error, Prism constant value 0mm, Prism constant value 30mm
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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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