Topcon AT-B/AT-BA Series Automatic Levels
NEW Features for AT-BA Series
- Completely NEW design
- Same compensator from AT-B2 series
- Lightweight at 1.5 kg (3.3 lb) A 13% reduction from previous version.
- Easy to grasp (compact body)
- Better visibility of horizontal circle
- Improved tangents/knobs
- Increased gear ratio for shock and vibration
The Topcon AT-B series levels set a new standard for auto levels used in construction, engineering, and surveying applications.
The AT-B series levels can focus on objects at 7.9 in. (20cm) in front of the telescope, while previous models provided 1.6 ft or 3.3 ft (50cm or 1m) minimum focusing distance. This feature dramatically facilitates the works in confined spaces.
The compensator of AT-B series levels incorporates four suspension wires made of extremely high-tensile metal that feautres minimal thermal expansion coefficient, 'providing unmatched durability and accuracy, even in the harshest environmental conditions'. 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.
With an IPx6 rating, the levels are protected against powerful water jets from all directions, meaning the AT-B series levels can withstand a sudden shower or torrential rainfall. This advanced protection design not only prevents water penetration, but also deters clouding or condensation inside the telescope.
Three models are available:
• AT-B2 - 32x magnification (optional 40x eyepiece available for AT-B2 only), 0.7mm accuracy (0.5mm accuracy with optional micrometer)
• AT-B3 - 28x magnification, 1.5mm accuracy
• AT-B4 - 24x magnification, 2.0mm accuracy
(Accuracy specifications are based on 1km double-run leveling)
Other features:
• Superior telescope design provides clear and bright view
• 2-speed focus on AT-B2 model only
• Horizontal circle (1° graduation) is covered for protection against dirt and scratching
Optional accessories:
• Diagonal eyepiece
• 40x eyepiece for AT-B2 model only
• Optical micrometer for 0.001ft/0.1mm readings for AT-B2 model only.
Copyright © Topcon Positioning Systems, Inc.
| Model
|
AT-B2
|
AT-B3/AT-B3A
|
AT-B4/AT-B4A
|
| Telescope
|
| Length
|
8.46 in. (215mm)
|
8.46 in. (215mm)
|
8.46 in. (215mm)
|
| Magnification
|
32x
|
28x
|
24x
|
| Objective Aperture
|
1.65 in. (42mm)
|
1.42 in. (36mm)
|
1.26 in. (32mm)
|
| Resolving Power
|
3"
|
3.5"
|
4"
|
|
Field of View
@328ft/100m
|
1°20'
(7.5ft/2.3m)
|
1°25'
(8.2ft/2.5m)
|
1°25'
(8.2ft/2.5m)
|
|
Minimum Focus
(from end of telescope)
|
7.9 in. (0.2m)
|
7.9 in. (0.2m)
|
7.9 in. (0.2m)
|
| Image
|
Erect
|
Erect
|
Erect
|
| Recticle Pattern
|
Wedge
|
Cross Line
|
Cross Line
|
| Stadia Constant
|
0
|
0
|
0
|
| Stadia Ratio
|
100
|
100
|
100
|
| Focusing Knob
|
2-Speed
|
1-Speed
|
1-Speed
|
| Sighting Aid
|
Peep Sight
|
Peep Sight
|
Gun Sight
|
| Lens Hood
|
Retractable
|
N/A
|
N/A
|
|
Accuracy (standard deviation for 1km double run leveling)
|
| Without Micrometer
|
0.03 in. (0.7mm)
|
0.06 in. (1.5mm)
|
0.08 in. (2.0mm)
|
| With Micrometer
|
0.02 in. (0.5mm)
|
N/A
|
N/A
|
| Compensator
|
| Type
|
Pendulum compensator with magnetic damping system
|
| Setting Accuracy
|
0.3"
|
0.5"
|
| Working Range
|
± 15'
|
| Circular Level
|
| Sensitivity
|
10'/2mm
|
| Mirror
|
Pentaprism
|
Plane Mirror
|
| Horizontal Circle
|
| Diameter
|
4.1 in. (103mm)
|
| Graduations
|
1°/1gon
|
| General
|
| Horizontal Motion Drive
|
Clampless, endless, double-sided knobs
|
| Water Resistance
|
IPX6 (IEC 60529:2001)
|
| Operating Temperature
|
-4 to +122°F (-20 to +50°C)
|
| Size
|
| Width
|
5.12 in. (130mm)
|
| Length
|
8.46 in. (215mm)
|
| Height
|
5.51 in. (140mm)
|
5.31 in. (135mm)
|
| Weight
|
4.1 lb (1.85kg)
|
3.7 lb (1.7kg)/3.3 lb (1.5kg)
|