Reflector 0/-30 Offset With Bubble Bag for Total Stations Surveying Tilting Topcon Prisms

Model: AK11

Specifications:

1. Prism Constant: 0mm/-30mm
2. Type: Single Prism
3. Color: Black and White
4. Prism Size: 64mm
5. Weight: 1Kg
6. Used For: Total Station (Sokkia, Nikon, Trimble, Pentax, Topcon etc.)
7. Package: Soft Yellow Carrying Bag
8. Target Plate: Metal
9. 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.