Topcon Auto Level Survey Instrument - 24x Magnification, Waterproof, China Suppliers & Factory Quality Assurance
Rapid, Stable, Durable Compensator
The compensator of AT-B Series incorporates four suspension wires made of super-high-tensile metal, which features minimal thermal expansion coefficient - providing unmatched durability and accuracy.
The finely tuned magnetic damping system quickly levels and stabilizes the line-of-sight despite the fine vibrations present when working near heavy equipment or busy roadways.
Horizontal Circle For Measurement
Horizontal angles can be directly read in 1° or 1 gon units. The free rotation feature allows you to read any angle from zero.
The circle is covered for protection against dirt and scratches and the readout window is located below the eyepiece for quick reference.
20 cm - Short Minimum Focus
The AT-B Series can focus on objects 20 cm in front of the telescope. This feature dramatically facilitates working in confined spaces.
All-weather Dependability
With the IPX6 rating, the instrument is protected against powerful water jets from all directions, meaning the AT-B Series withstands a sudden shower or torrential rainfall. The advanced protection design also deters clouding or condensation inside the telescope.
There are three models available depending on your accuracy requirements:
- AT-B4: 24x, 2.0mm accuracy.
- AT-B3: 28x, 1.5mm accuracy.
- AT-B2: 32x magnification (40x optional), 0.7mm accuracy (0.5mm with an optional micrometer).
Specifications
| Telescope | AT-B2 | AT-B3 | AT-B4 |
|---|---|---|---|
| Length | 215mm (8.46 in) | 215mm (8.46 in) | 215mm (8.46 in) |
| Magnification | 32X | 28X | 24X |
| Objective Aperture | 42mm (1.65 in.) | 36mm (1.42 in.) | 32mm (1.26 in.) |
| Resolving Power | 3 in | 3.5 in | 4.0 in |
| Field of View | 1°20' | 1°25' | 1°25' |
| At 100m/328ft | 2.3m(7.5ft) | 2.5m(8.2ft) | 2.5m(8.2ft) |
| Min. Focus from end of telescope | 0.2m(7.9 in) | 0.2m(7.9 in) | 0.2m(7.9 in) |
| Min. Focus from instrument center | 0.3m (1ft) | 0.3m (1ft) | 0.3m (1ft) |
| Image | Erect | Erect | Erect |
| Stadia constant | 0 | 0 | 0 |
| Stadia ratio | 100 | 100 | 100 |
| Focusing Knob | 2-speed | 1-speed | 1-speed |
| Sighting Aid | Peep sight | Gun Sight | Gun Sight |
| ACCURACY (1 km double run leveling) | |||
| Without Micrometer | 0.7mm(0.03 in) | 1.5mm(0.06 in) | 2.0mm(0.08 in) |
| With micrometer | 0.5mm(0.02in) | N/A | N/A |
| Compensator | |||
| Type | Pendulum compensator with magnetic damping system | ||
| Setting Accuracy | 0.3 in. | 0.5 in. | 0.5 in. |
| Working Range | ±15' | ±15' | ±15' |
| CIRCULAR LEVEL | |||
| Sensitivity | 10'/ 2mm | 10'/ 2mm | 10'/ 2mm |
| HORIZONTAL CIRCLE | |||
| Diameter | 103mm(4.1 in) | 103mm(4.1 in) | 103mm(4.1 in) |
| Minimum division | 1°/1gon | 1°/1gon | 1°/1gon |
| General | |||
| Water resistance | IPX6 (IEC 60529: 2001) | ||
| Operating temperature | -4°F~+122°F (-20ºC~+50ºC) | ||
Frequently Asked Questions (FAQ)
Q: What are the key differences between the AT-B2, AT-B3, and AT-B4 models?
A: The main differences lie in magnification power and leveling accuracy. The AT-B2 features 32X magnification with 0.7mm accuracy (0.5mm with micrometer); the AT-B3 offers 28X magnification with 1.5mm accuracy; and the AT-B4 provides 24X magnification with 2.0mm accuracy.
Q: How does the compensator system maintain stability on busy jobsites?
A: The AT-B Series features a pendulum compensator with a finely tuned magnetic damping system and four super-high-tensile metal suspension wires. This setup minimizes thermal expansion and quickly stabilizes the line-of-sight against vibrations from heavy machinery or traffic.
Q: What is the benefit of the 20 cm minimum focus distance?
A: The exceptionally short 20 cm (7.9 inches) minimum focus distance from the end of the telescope allows the instrument to be used efficiently in highly confined or narrow work environments where space is limited.
Q: Are these automatic levels suitable for harsh weather conditions?
A: Yes. With an IPX6 water resistance rating, the AT-B Series is protected against powerful water jets from all directions. Its advanced optical structure is also designed to prevent clouding and condensation inside the telescope.
Q: How is the horizontal circle read and adjusted?
A: Horizontal angles can be read directly in 1° or 1 gon increments via a readout window placed right below the eyepiece. A free rotation system allows you to easily set and read any angle starting from zero.