Reflector 0/-30 Offset With Bubble Bag for Total Stations Surveying
Tilting Topcon Prisms
Model: AK11
Specifications:
- Prism Constant: 0mm/-30mm
- Type: Single Prism
- Color: Black and White
- Prism Size: 64mm
- Weight: 1Kg
- Used For: Total Station (Sokkia, Nikon, Trimble, Pentax, Topcon etc.)
- Package: Soft Yellow Carrying Bag
- Target Plate: Metal
- Thread Type: 5/8x11 female thread
Features:
This complete tilting prism assembly comes with a 64mm prism
mounted in a sealed canister.
The prism can either be mounted in a -30mm or zero offset position.
With Removable Metal Target Plate.
Tilting knob can fix the prism angle.
High reflection rate by aluminum coated prism
Un-foggy by aluminum coating on prism and sealed structure
Prism Comes with a protective padded nylon carrying case.
Survey Prism Offsets
Some Surveying Prisms have an offset due to the fact that the
transmitted beam from the EDM takes longer to enter and exit the
prism. The longer time translates to a longer distance measured.
The distance is corrected by using an 'offset' and/or positioning
the prism in relationship to the plumb line of the prism holder.
Common offsets are 0, -17.5 mm, -30 mm, -34 mm, and -40 mm. The
offset is determined by multiplying the height of the prism against
the refractive index of the glass used.
Prism Holder Accuracy
Prism accuracy is determined by the physical location of the prism
in its canister and then to the prism holder. Certificates of
compliance are available upon request.
Prism Range
Surveying Prisms, also known as retro-reflectors, redirect a
measuring beam back to the EDM (Electronic Distance Measurement)
for processing distance. There are two main factors for good range
measurement: prism diameter and beam deviation. If the beam
deviation is not accurate then the returned beam will miss the EDM
completely. This occurs mainly near the maximum range of the EDM.
