The TOPCON Geodetic Total Station GTS-3B (GTS-3C) is a sophisticated tachometer designed for field surveying and as a key component in computerized surveying systems. It integrates electronic angle reading and distance measuring functions, offering high accuracy and efficiency for various surveying tasks.
Function Description:
The GTS-3B and GTS-3C models provide comprehensive measurement capabilities:
- Angle Measurement: Both models offer electronic angle reading. The GTS-3B provides 5-second reading with 5-second divisions, while the GTS-3C offers 10-second reading with 5-second divisions. The unit of angle measurement can be changed via option switches, with 1-second reading available for the GTS-3B and 10-second reading for the GTS-3C. Angle measurement is obtained using the incremental method, and the "O" position of the vertical angle is easily set.
- Distance Measurement: The GTS-3B can measure distances up to 2.5 km, while the GTS-3C measures up to 1.8 km. The device supports continuous and single distance measurements.
- Data Display and Storage: Measurements, including horizontal angles, vertical angles, slope distances, horizontal distance, relative elevation, coordinates of an unknown point, and elevation, are displayed through a liquid crystal display. Data can be electronically transmitted and stored using TOPCON's FC-1 Data Collector.
- Correction Functions: The instrument incorporates a built-in high-precision tilt sensor (liquid compensator) for vertical axis correction, enabling accurate relative elevation measurements. It also allows for atmospheric correction and prism constant correction.
- Coordinate Measurement: The device can be used for coordinate measurement, facilitating detailed surveys.
- Combined Use with Data Collector: The GTS-3B/3C can be connected to the FC-1 Data Collector for enhanced functionality, including data storage, stake out, and coordinate measurement.
- Computer Connectivity: It is possible to connect the GTS-3B/3C to a computer using a serial signal RS-232C connector, allowing for data transfer and integration with computer systems for graphic expression and computation in design.
Important Technical Specifications:
- Telescope:
- Length: 152 mm
- Objective aperture: 40 mm (EDM: 45 mm)
- Magnification: 30X
- Image: Erect
- Field of view: 1°20′
- Resolving power: 3"
- Minimum focus distance: 1.5 m
- Distance Measurement Range (Atmospheric Condition 1 / Condition 2):
- GTS-3B:
- 1 Prism: 2,000 m (6,600 ft) / 2,300 m (7,600 ft)
- 3 Prisms: 2,700 m (8,700 ft) / 3,100 m (10,200 ft)
- 9 Prisms: 3,600 m (11,800 ft) / 4,200 m (13,800 ft)
- GTS-3C:
- 1 Prism: 1,600 m (5,200 ft) / 1,800 m (5,900 ft)
- 3 Prisms: 2,200 m (7,200 ft) / 2,500 m (8,200 ft)
- 9 Prisms: 2,800 m (9,200 ft) / 3,400 m (11,100 ft)
- Condition 1: Slight haze with visibility about 20 km (12.5 miles), moderate sunlight with light heat shimmer.
- Condition 2: No haze with visibility over 40 km (25 miles), overcast with no heat shimmer.
- Measurement Accuracy:
- GTS-3B: ± (5mm + 3 ppm) m.s.e.
- GTS-3C: ± (5mm + 3 ppm) m.s.e. -10°C to +40°C; ± (5mm + 7 ppm) m.s.e. -20°C to -10°C, +40°C to +50°C
- Display Unit:
- Number of distance (Single)/Continuous measurement: 1 mm (0.005 ft.)
- Tracking/Coarse: 10 mm (0.02 ft.)
- Maximum Display Level: 19999.999 m
- Measuring Time:
- Number of distance/Continuous measurement: 4 sec.
- Tracking/Coarse: 0.6 sec.
- Atmospheric Correction Range: -58 ppm to +98 ppm (2 ppm-step)
- Prism Constant Correction Range: -80 mm to +20 mm (1 mm-step)
- Meter/Feet Conversion Value: 1 m = 3.280833 ft.
- Angle Measurement:
- Method: Incremental reading
- Diameter of circle: 71 mm
- Minimum reading: 5" (1")/GTS-3B, 5" (10")/GTS-3C
- Accuracy (standard deviation based on DIN18723): 2"/GTS-3B, 5"/GTS-3C
- Automatic vertical index working range: ±3′
- Level Sensitivity:
- Circular level: 10'/2mm
- Plate level: 30"/2mm
- Optical Plummet Telescope:
- Image: Erect
- Magnification: 3 X
- Focusing range: 0.5 m to infinity
- Field of view: 5°
- Instrument Height (Tilting axis above tribrach dish): 176 mm
- Ambient Temperature Range: -20°C to +50°C (-4°F to +122°F)
- Dimensions:
- Without Handle battery or Carrying handle: 291 mm × 190 mm × 152 mm (11.46 in × 7.28 in × 5.98 in)
- With Handle battery or Carrying handle: 346 mm × 190 mm × 152 mm (13.6 in × 7.28 in × 5.98 in)
- Plastic carrying case: 536 mm × 375 mm × 240 mm (21.2 in × 14.8 in × 9.45 in)
- Weight:
- Without Handle battery or Carrying handle: 5.2 kg (11.5 lb)
- With Handle battery: 6.2 kg (13.7 lb)
- Plastic carrying case: 6.2 kg (13.7 lb)
- Battery (Handle battery BT-15Q):
- Type: NiCd
- Output voltage: DC8.4V
- Capacity: 1.8AH
- Maximum operating time (at +20°C/+68°F):
- Including distance measurement: 2.5 hours
- Angle measurement only: 12.5 hours
- Weight: 1 kg (2.2 lb)
- Battery Pack (BT-3Q):
- Type: NiCd
- Output voltage: DC8.4V
- Capacity: 1.8AH
- Maximum operating time (at +20°C/+68°F):
- Including distance measurement: 2.3 hours
- Angle measurement only: 11 hours
- Weight: 0.7 Kg (1.6 lb)
- Battery Charger (BC-10B / BC-10C):
- Input voltage: AC120V±10% / AC230V±10%
- Frequency: 50/60 HZ
- Recharging time (at +20°C/+68°F) for BT-15Q / BT-3Q: 15 hours / 15 hours
- Operating temperature: 10°C to 40°C (50°F to 104°F)
- Charging signal: Red lamp illumination
- Weight: 0.2 kg (0.5 lb) / 0.4 kg (0.9 lb)
Usage Features:
- Ease of Use: The instrument is designed for straightforward operation, with clear instructions for power connection, leveling, and power-on procedures.
- Versatile Measurement Modes: It supports various measurement modes, including right and left horizontal angle measurement, repeat angle measurement, and different distance measurement options (continuous, single, tracking, coarse).
- Data Management: The ability to store data electronically and transmit it to a data collector or computer streamlines fieldwork and post-processing.
- Adaptability: The GTS-3B/3C is suitable for a wide range of engineering surveys, including detailed surveys, peg checking, reference, reconstruction, and distance measurement.
- Portability: Through TOPCON's technology, the instrument is compact and lightweight (5.2 kg without handle battery), making it convenient for field use.
- Accuracy Enhancement: Accuracy around the far end of measuring distance is enhanced by adding the number of prisms; higher accuracy is available with 3 prisms than with a single prism, and even higher accuracy with 9 prisms.
Maintenance Features:
The manual provides detailed instructions for various adjustments and checks to ensure the instrument's accuracy and longevity:
- Optical Axes Adjustment: Procedures for adjusting the optical axes.
- Distance Measurement Accuracy Check: Steps to verify the accuracy of distance measurements.
- Cross-hair Adjustment: Instructions for adjusting the vertical cross-hair.
- Level Adjustment: Procedures for adjusting both the plate level and the circular level.
- Vertical Angle O Datum Adjustment: Steps to set the "O" position of the vertical angle.
- Collimation: Instructions for collimation of the instrument.
- Optical Plummet Telescope Adjustment: Procedures for adjusting the optical plummet telescope.
- Battery System Maintenance: Information on handle battery (BT-15Q) and external battery pack (BT-3Q) usage, charging, and care.
- Error Displays: A section dedicated to understanding and troubleshooting error messages.
- Detachable Tribrach: Information regarding the detachable tribrach for instrument stability.
The manual emphasizes the importance of reading it carefully to make the best use of the instrument and keeping it in a safe place for future reference. It also includes precautions to ensure safe and effective operation.
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