Topcon AT-B Series – Auto Level
Utilizing a finely tuned magnetic damping system, AT-B series automatic levels quickly level and stabilize the line of sight. These precision instruments ensure reliable leveling even when working near heavy equipment or busy highways where fine vibrations could be present. The automatic levels feature IPX6 protection against powerful water jets from all directions and are fully resistant to driving rain and splashing water.
Horizontal angles can be directly read in 1º or 1gon units. Free rotation feature allows you to read any angle from zero. The circle is covered for protection against dirt and scratch. The readout window is located below the eyepiece for quick reading.
Topcon AT-B Series Features:
• Durable, Dependable, High Value Auto Levels
• 3 Models – 32x, 28x, and 24x Magnifications
• Rapid, Accurate, and Stable Automatic Compensation
• Ultra-Short 20cm (7.9 in.) Focusing
• All-Weather Dependability
• Clampless, Endless Fine Horizontal Adjustments
Rapid, Stable, and Durable Compensator
The compensator of AT-B Series incorporates four suspension wires made of super-high-tensile metal that features minimal thermal expansion coefficient, providing unmatched durability and accuracy. 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 Angle Measurement
Horizontal angles can be directly read in 1º or 1gon units. Free rotation feature allows you to read any angle from zero. The circle is covered for protection against dirt and scratch. The readout window is located below the eyepiece for quick reading.
20cm (7.9 in.) – Ultra-Short Minimum Focus
The AT-B Series can focus on objects at 20cm (7.9 in.) in front of the telescope. This feature dramatically facilitates the works in confined spaces.
Topcon Auto Level AT-B Series Technical Specifications:
| Technical 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 in. |
| Field of View | 1°20’ | 1°25’ | 1°25’ (at 100m/328ft.) |
| (at 100m/328ft.) | (2.3m/7.5 ft.) | (2.5m/8.2 ft.) | (2.5m/8.2 ft.) |
| 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 (1 ft.) | 0.3m (1 ft.) | 0.3m (1 ft.) |
| 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 | AT-B2 | AT-B3 | AT-B4 |
| Without Micrometer | 0.7mm (0.03 in.) | 1.5mm (0.06 in.) | 2.0mm (0.08 in.) |
| With Micrometer | 0.5mm (0.02 in.) | n/a | n/a |
| COMPENSATOR | AT-B2 | AT-B3 | AT-B4 |
| Type | Pendulum compensator with magnetic damping system | ||
| Setting Accuracy | 0.3 in. | 0.5 in. | 0.5 in. |
| Working Range | ±15 ft. | ±15ft. | ±15 ft. |
| CIRCULAR LEVEL | AT-B2 | AT-B3 | AT-B4 |
| Sensitivity | 10 ft./2mm | 10 ft./2mm | 10 ft./2mm |
| HORIZONTAL CIRCLE | AT-B2 | AT-B3 | AT-B4 |
| Diameter | 103mm (4.1 in.) | 103mm (4.1 in.) | 103mm (4.1 in.) |
| Minimum Division | 1°/1gon | 1°/1gon | 1°/1gon |
| GENERAL | AT-B2 | AT-B3 | AT-B4 |
| Water Resistance | IPX6 (IEC 60529:2001) | ||
| Operating Temperature | -4°F to +122°F (-20ºC to +50ºC) | ||
| Width | 5.12 in. (130mm) | 5.12 in. (130mm) | 5.12 in. (130mm) |
| Length | 8.46 in. (215mm) | 8.46 in. (215mm) | 8.46 in. (215mm) |
| Height | 5.51 in. (140mm) | 5.51 in. (140mm) | 5.31 in. (135mm) |
| Weight | 4.1 lbs. (1.85kg) | 3.7 lbs. (1.7kg) | 3.7 lbs. (1.7kg) |
