Topcon's engineering and construction automatic levels are streamlined and more compact than ever. They are lightweight for easy transport and the completely waterproof telescope is effective for all kinds of wet surveying operations.
Angular reading to 10 minutes (AT-G1)
Model AT-G1 has a glass horizontal circle which is graduated in 10 minute divisions (10c divisions) and numbered every degree (one grade) with calibrations from 0° to 360° (0g to 400g). Furthermore, readings are possible through a 25x reading microscope, with only a slight shift of the eye, from the telescope eyepiece. The horizontal circle freely rotates for zero alignment.
Waterproof sealed telescope construction
The instrument has a completely waterproof telescope and is therefore ideal for all kinds of wet-surveying operations, in light rain or in tunnels. Only test-approved telescopes are used and dry nitrogen gas is sealed in the telescope tube. This effectively prevents lens clouding and moisture condensation.
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| Specifications |
| Telescope |
| |
AT-G1 |
AT-G3 |
AT-G6 |
| Length (mm) |
229/9 |
230 |
193 |
| Image |
Erect |
Erect |
Erect |
| Magnifaction |
32x |
30x |
24x |
| Objective Lens mm |
45 |
40 |
30 |
| Relative brightness |
1.98 |
1.78 |
1.56 |
| Field of view |
1°20’ |
1°30’ |
1°30’ |
| Resolving power |
2.5" |
3.0" |
4.0" |
| Minimum focus (m) |
1.0 |
0.5 |
0.5 |
| Stadia constant |
0 |
0 |
0 |
| Stadia ratio |
100 |
100 |
100 |
| Circular level |
| Sensitivity (/2 mm) |
8' |
8' |
10' |
| Automatic levelling |
| Setting accuracy |
±0.3” |
±0.3” |
±0.3” |
| Compensating range |
±15’ |
±15’ |
±15’ |
| Accuracy (1km Double Run Levelling) |
| Without optical micrometer (mm) |
±0.75 |
±1.5 |
±2.0 |
| With optical micrometer (mm) |
±0.45 |
±1.0 |
- |
| Horizontal Circle |
| Diameter (mm) |
90 |
117 |
117 |
| Minimum division |
10'(0.1g) |
1°(1g) |
1°(1g) |
| Weight |
| Instrument (kg) |
2.1 |
1.8 |
1.6 |
| Plastic carry case (kg) |
1.3 |
1.3 |
1.3 |
Rapid, stable automatic levelling
A time-proven magnetically damped compensator is incorporated for automatic levelling action. It is not affected by fine vibrations and has been proven to have very stable precision, thus speeding up automatic levelling operations and producing accurate results. The Topcon-exclusive automatic levelling system utilises four special mylar ribbons for hanging the magnetic damper compensator. The compensator is therefore not influenced by the magnetic field, as well as having superior resistance to cold, heat and shock. |