AT-G series Auto Level for Surveying. AT-G1 for high accuracy with angular reader. AT-G2 for high accuracy. AT-G3 for versatile. AT-G4/G6 for construction.

1. SPECIFICATIONS
MODEL
AT-G1 AT-G2/G2A AT-G3 AT-G4 AT-G6 AT-G7N
ITEM
Telescope
Length (mm/in.) 229/9 229/9 230/9 192/7.7 193/7.7 193/7.7 AUTO LEVEL
Image Erect Erect Erect Erect Erect Erect
AT-G series
Magnification 32× 32× 30× 26× 24× 22×
Objective lens (mm/in.) 45/1.8 45/1.8 40/1.6 30/1.2 30/1.2 30/1.2
Relative brightness 1.98 1.98 1.78 1.33 1.56 1.86
Field of view 1°20' 1°20' 1°30' 1°30' 1°30' 1°30'
Resolving power 2.5" 2.5" 3.0" 3.5" 4.0" 4.0"
Minimum focus (m/ft.) 1.0/3.2 1/3.2 0.5/1.6 0.5/1.6 0.5/1.6 0.5/1.6
Stadia constant 0 0 0 0 0 0
Stadia ratio 100 100 100 100 100 100
Circular Level
Sensitivity (/2mm) 8' 8' 8' 8' 8' 10'
Automatic Leveling
Setting accuracy ±0.3" ±0.3" ±0.3" ±0.3" ±0.3" ±0.5"
Compensating range ±15' ±15' ±15' ±15' ±15' ±15'
Accuracy at 30m/100ft
w/o optical micrometer (mm) — — — ±2.0/±0.08 ±2.0/±0.08 ±2.5/±0.1
Accuracy 1km Double Run Level
w/o optical micrometer (mm) ±0.7/±0.03 ±0.7/±0.03 ±1.5/±0.06 ±2.0/±0.08 ±2.0/±0.08 ±2.5/±0.1
with optical micrometer (mm) ±0.4/±0.02 ±0.4/0.02 ±1.0±0.04 — — —
Horizontal Circle
Diameter (mm/in.) 90/3.5 117/4.7 117/4.7 117/4.7 117/4.7 117/4.7
OPTIONAL ACCESSORIES Minimum division
Weight
10'(0.1g) 1°(1g) 1°(1g) 1°(1g) 1°(1g) 1°(1g)
Instrument (kgs./lbs.) 2.1/4.6 1.8/4.1 1.8/4.1 1.6/3.5 1.6/3.5 1.6/3.5
DIAGONAL EYEPIECE 40X EYEPIECE Plastic carrying case (kgs./lbs.) 1.3/2.9 1.3/2.9 1.3/2.9 1.3/2.9 1.3/2.9 1.3/2.9
Setting the diagonal eyepiece in Increases magnification of • Designs and specifications herein are subject to change without notice.
place of the standard telescope the telescope of AT-G
In order to obtain the best results with this instrument,
eyepiece provides for collimating series engineering auto lev- Important please be sure to review all user instructions prior to operation.
with easy posture. els from 32X to 40X for
[AT-G1/G2/G2A/G3] even more precise leveling.
[AT-G1/G2/G2A]
OPTICAL MICROMETER ILLUMINATOR-5 CENTERING PLATFORM
Get greater accuracy from AT-G series Provides light to the telescope reticle When used on top of tripod provides
engineering auto levels. In one kilome- when available light is insufficient, for quick and simple centering on refer-
ter of double run levelling, accuracy is example, in tunnels or at night. ence points. Parallel shifts of 100mm
improved to ±0.4mm (0.001 ft.). [AT-G1/G2/G2A/G3] vertically and 30mm laterally. TOPCON CORPORATION
75-1 Hasunuma-cho, Itabashi-ku, Tokyo 174-8580, Japan Phone: (+81)3-3558-2527/2521 Fax: (+81)3-3960-4214 www.topcon.co.jp
Attaches to front of objective lens with
TOPCON POSITIONING SYSTEMS, INC. TOPCON SCANDINAVIA A. B. TOPCON KOREA CORPORATION
a counter-weight attached to the eye- 7400 National Drive, Livermore, CA 94551, U.S.A. Neongatan 2 S-43151 Molndal, SWEDEN 2F Yooseoung Bldg., 1595-3, Seocho-Dong, Seocho-gu, Seoul, 137-87
Phone: (+1)925-245-8300 Fax: (+1)925-245-8599 www.topcon.com Phone: (+46)31-7109200 Fax: (+46)31-7109249 Phone: (+82)2-2055-0321~7 Fax: (+82)2-2055-0319 www.topcon.co
piece. [AT-G1/G2/G2A/G3] TOPCON CALIFORNIA TOPCON (GREAT BRITAIN) LTD. TOPCON OPTICAL (H.K.) LIMITED
3380 Industrial Blvd, Suite 105, West Sacramento, CA 95691, U.S.A. Topcon House Kennet Side, Bone Lane Newbury RG 14 2PX U.K. 2/F., Meeco Industrial Bldg., No. 53-55 Au Pui Wan Street, Fo Tan Road
Phone: (+1)916-374-8575 Fax: (+1)916-374-8329 Phone: (+44)1635-551120 Fax: (+44)1635-551170 Shatin, N.T., Hong Kong
TOPCON EUROPE POSITIONING B.V. www.topcon.co.uk Phone: (+852)2690-1328 Fax: (+852)2690-2221 www.topcon.com.h
Essebaan 11, 2908 LJ Capelle a/d IJssel, The Netherlands. TOPCON SOUTH ASIA PTE. LTD. TOPCON CORPORATION BEIJING OFFICE
Phone: (+31)10-458-5077 Fax: (+31)10-284-4949 www.topconeurope.com Blk 192 Pandan Loop, #07-01 Pantech Industrial Complex, Singapore 128381 Building B No.9, Kangding Street
IRELAND OFFICE Phone: (+65)62780222 Fax: (+65)62733540 www.topcon.com.sg Beijing Economic-Technological Development Area, Beijing, 100176, C
Unit 69 Western Parkway Business Center Phone: (+86)10-6780-2799 Fax: (+86)10-6780-2790
Lower Ballymount Road, Dublin 12, Ireland
TOPCON AUSTRALIA PTY. LTD.
Phone: (+353)1460-0021 Fax: (+353)1460-0129 Unit 18, 4 Avenue of Americas, Newington, NSW 2127, Australia TOPCON CORPORATION BEIRUT OFFICE
Phone: (+61)2-8748-8777 Fax: (+61)2-9647-2926 www.topcon.com.au P. O. BOX 70-1002 Antelias, BEIRUT-LEBANON.
TOPCON DEUTSCHLAND G.m.b.H. TOPCON INSTRUMENTS (THAILAND) CO., LTD. Phone: (+961)4-523525/961-4-523526 Fax: (+961)4-521119
Giesserallee 31-33, 47877 Willich, Germany
Phone: (+49)2154-8850 Fax: (+49)2154-885111 www.topcon.de 77/162 Sinn Sathorn Tower, 37th Fl., TOPCON CORPORATION DUBAI OFFICE
Krungdhonburi Rd., Klongtonsai, Klongsarn, Bangkok 10600 Thailand. C/O Atlas Medical FZCO., P .O. BOX 54304, C-25, Dubai Airport Free Zone
TOPCON S.A.R.L. Phone: (+66)2-440-1152~7 Fax: (+66)2-440-1158 United Arab Emirates
89, Rue de Paris 92585 Clichy, Cedex FRANCE Phone: (+971)4-2995900 Fax: (+971)4-2995901
Phone: (+33)1-41069494 Fax: (+33)1-47390251 www.topcon.fr
TOPCON INSTRUMENTS (MALAYSIA) SDN. BHD.
Exella Business Park Block C, Ground & 1st Floor, Jalan Ampang Putra,
Taman Ampang Hilir, 55100, Kuala Lumpur, Malaysia. PRINTED WITH SOY INK
Phone: (+60)3-42701068 Fax: (+60)3-42704508
# 7010-0390 ©1998-2005 TOPCON CORPORATION
Printed in Japan 2005 12-30LW 762-10 TPS
Middle East & Africa
marketing@topcongulf.com www.topconmembers.com/a

2. The AT-G series contains a level product that meets all possible level applications.
Topcon’s newly-designed engineering and construction automatic levels are streamlined
and more compact than ever. They are lightweight for easy transport and the completely
RAPID, STABLE
waterproof telescope is effective for all kinds of wet surveying operations. AUTOMATIC LEVELING
EASY-TO-SEE A time-proven magnetically-damped com-
pensator is incorporated for automatic lev-
CIRCULAR LEVEL
PRECISION-BUILT FOR EXCELLENT LEVELING ACCURACY OBSERVATION
eling action. It is not affected by fine vibra-
tions and has been proven to have very
AND PERFORMANCE EVERY TIME FOR ENGINEERING The circular level is checked stable precision, thus speeding up auto-
matic leveling operations and producing
very easily with a slight shift of
the eye, with a clear, distinct accurate results.
view observed via reflecting The TOPCON-exclusive automatic level-
pentagonal mirror (AT-G1/G2/ ing system utilizes four special mylar rib-
G3), pentagonal prism (AT- bons for hanging the magnetic damper
G2A), hinged mirror (AT-G4/G6/ compensator, which is, therefore, not influ-
G7N). enced by the magnetic field, as well as
having superior resistance to cold, heat
[G1/G2/G2A] [G3~G7N] and shock.
AT-G1 AT-G2 AT-G4
WATERPROOF
SEALED TELESCOPE
CONSTRUCTION AT-G1
The instrument has a completely
waterproof telescope and is,
therefore, ideal for all kinds of ANGULAR READING TO
wet-surveying operations, in light
rain or in tunnels. 10 MINUTES [AT-G1]
Only test-approved telescopes Model AT-G1 has a glass horizontal
circle which is graduated in 10 minute AT-G1
are used and, furthermore, dry
nitrogen gas is sealed in the tele- divisions (10c divisions) and num-
bered every degree (one grade), with
scope tube which effectively pre-
vents lens clouding and moisture calibrations from 0° to 360° (0g to AT-G2A AT-G3 AT-G6 AT-G7N
condensation. 400g). Furthermore, readings are pos-
sible through a 25x reading micro-
RUBBER EYEPIECE CAP
scope, with only a slight shift of the Sighting through Topcon G-series levels
eye, from the telescope eyepiece. AT-G4 include AT-G7N is safe for anyone who
And, the horizontal circle freely rotates SHORT FOCUS CONSTRUCTION LEVELS BUILT TOUGH TO LAST wears eyeglasses.
With their protective rubber eyepiece caps,
for zero alignment. ANGULAR READING scratches and abrasions are reduced or
[AT-G2~G7N] eliminated completely.
NEW ERGONOMIC CLAMPLESS FINE The horizontal circle is graduat-
FAST INSTRUMENT VERY SHORT 0.5 ed from 0° to 360° (0g to 400g)
DESIGN HORIZONTAL ADJUSTMENTS METER FOCUSING clockwise in 1° (1g) divisions
Redesigned for smoother, easier 2 SPEED FOCUSING Fine horizontal adjustments are possible at SET-UP and the value is indicated for
operation all around, Topcon’s any point through 360° (400g) of the arc, with- Very fast instrument set-up is [AT-G3/G4/G6/G7N] each 10° (10g).
new G-series levels offer a larger [AT-G1/G2A] out clamping action, which means that target possible because the base This instrument has a short range
knob for faster, accurate adjust- Fine and coarse focusing is provided alignments are greatly speeded up. plate can be used for fixing on setting position of 0.5 meter which
ments and new materials for by a coaxial focusing knob, which per- Furthermore, fine horizontal knobs are avail- top of dome head tripods, such is suitable for close range work
lighter weight when you’re on the mits rapid setting and accurate focus- able on both sides, for very easy and speedy as the TOPCON Dome Head carried out by builders and con-
move. ing for perfect image at the same time. adjustments. Aluminum Tripod. tractors.