Auto Level Topcon AT-B4A -

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)

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