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Topcon AT-B Series Automatic Level

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Topcon AT-B Auto Levels:

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

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)

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