PAB – 2AT – Periscopic artillery aiming circle
Periscopic artillery compass PAB- 2AT represents an optomechanical instrument which, as the basic instrument in battery and devision, serves for:
- measuring of magnetic azimuth,
- determination of geographical azimuth,
- instruments and weapons orientation by marking with celestial bodies,
- measuring of horizontal and vertical angles,
- showing of targets and
- measuring of hits deviation and points` height of explosions.
Instruments can be used on firing posintions, observation posts and during topographical operatios.
Accuracy of azimuth reading for horizontal and vertical angles, during operation with instrument, amounts up to 0-01.
Instrument according to the magnetic needle is carried out with middle error not more then 0-01, while the accidental error can be up to 0-03.
Azimuth supplement of compass serves for the determination of geographical azimuth.
Periscope serves for operation from shelter. In the cases of using of periscope it is not possible to use compass azimuth supplement, and vice versa.
Optical data
Compass
| Magnification | 8x |
| Field of view | 0-83 or 5º (in linear meas. 87m at distance of 1000m) |
| Entrance pupil diameter | 22 mm |
| Exit pupil diameter | 2.8 mm |
| Distance of exit from the last ocular lens | 12.5mm |
| Resolving power in the centre of filed of view | ≤ 6″ |
Periscope
| Magnification8 | 1x |
| Field of view | 5º |
| Resolution power in the centre of field of view | ≤ 7″ |
| Periscopic ability | 350mm |
Azimuth supplement
| Magnification8 | 4x |
| Field of view | 1-55.5 or 9º20′ |
| Exit pupil diameter | 4 mm |
| Resolution power in the centre of field of view | ≤ 16º |
| Sighting line deviation from the vertical field at sight shifting within vertical field for size of angle 90º | 0-00.5 or 2′ |
Design data
| Posibility of angle measuring | horizontal: 60-00 vertical: ±3-00 |
| Division value of goniometer plate | 0-01 |
| Division value of goniometer drum | 1-00 |
| Division value of compass plate | 0-01 |
| Division value of compas drum | 1-00 |
| Division value of site device plate | 0-01 |
| Division value of site device drum | 1-00 |
| Division value of graticule, goniometric scales | 0-05 |
| Possibility of distance measuring with measuring picket 2m long | 50 to 400m |
| Division value of graticule distance scale | from 50 to 100m: 2m from 100 to 150m: 5m from 150 to 200m: 10m from 200 to 300m: 20m from 300 to 400m: 50m |
| Sensitivity of circular level | 0-03 |
| Sensitivity of tubular level | 2′ |