The Topcon AT-B4A is the entry level Automatic Level in the AT-B Series.
The Topcon AT-B series of Auto levels are durable, dependable, high value automatic levels. They all share the same type of compensator system, the ultra-short focusing and protection from the harshest of weather.
- 24x Magnification
- Wide Field of View
- Class Leading Pendulum Compensator System with Magnetic Damping
- 360 Degree Fine Horizontal Adjustment
- See Images from just 200mm away.
The Topcon AT-B4A has a very short focusing ability. Reading a staff from just 200mm away is far better than any other auto level from other manufacturers. This is a handy advantage when working close up or wanting to be close to a datum point. The Topcon AT-B4A has a magnification of 24times, significantly more than other manufacturers’ base auto levels, and the field of view is a wide 1 degree and 25 minutes. The focusing on the Topcon AT-B4A is a single speed adjustment. It also has a horizontal circle for angle measurements to the nearest degree, it is free to rotate so that angles can be easily read from a zero datum. The image is erect (staff is viewed upright) and there are also the stadia marks on the cross hairs to allow for distance readings to be taken from the staff. These stadia marks are set at the standard 1:100 ratio.
The Topcon AT-B4A has a rating of IPX6 which means that it there is no data available on dust protection but it is protected from powerful water jets (a test that lasts for 3minutes using 100 litres every minute). This protection helps prevent condensation forming inside the telescope.
Accuracy for a 1km double run levelling run is quoted by Topcon as being 2.0mm for the Topcon AT-B4A. There is no micrometer available to increase the accuracy quoted for the Topcon AT-B4A.