Sokkia B20 Auto Level
Model |
B40 |
B30 |
B20 |
Telescope | |||
Length |
215mm(8.46 inch) |
||
Objective aperture |
32mm |
36mm |
42mm |
Magnification |
24X |
28X |
32X |
Image |
Erect |
||
Resolving power |
4" |
3.5" |
3.0" |
Field of view(at 100m) |
1° 25′ (2.5m) |
1° 20′ (2.3m) |
|
Minimum focussing distance |
0.2m (7.9in.) from end of telescope |
||
Reticle pattern |
Cross hairs |
wedge |
|
Stadia ratio |
100 |
||
Stadia constant |
0 |
||
sighting aid |
Gun sight |
Peep sight |
|
Focusing Knob |
1-speed |
2-speed |
|
Lense hood |
- |
Retractable |
|
Accuracy(standard deviation for 1km double run leveling) | |||
Without micrometer |
2.0mm |
1.5mm |
0.7mm |
With micrometer |
0.5mm |
||
Compensator | |||
Type |
pendulum compensator with magnetic damping system |
||
Working range |
± 15′ |
||
Setting accuracy |
0.5" |
0.3" |
|
Horizontal Circle | |||
Diameter |
103mm (4.1in.) |
||
Graduation |
1°/1gon |
||
General | |||
Sensitivity of circular level |
10′/2mm |
||
Mirror for circular level |
Plane mirror |
pentaprism |
|
Horizontal motion drive |
Clampless, endless, double-sided knobs |
||
Water resistance |
IPX6(IEC60529) |
||
Operating temperature |
-20-+50°C (-4 to +122°F) |
||
Size |
122mm× 215mm× 135mm |
130mm× 215mm× 140mm |
|
Weight |
1.7kg (3.7 lb.) |
1.85kg (4.1 lb.) |
|
Shanghai Sursup Precision Instrument Co., LTD
addr: Building 67, Lane 258, West Xiuyan Road, Pudong New District, Shanghai, China
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