Product Details
Reflector Prisma Topcon Type Prism Assembly Black and White Color
Total Station Prisms
Model: AK10
Specifications:
Prism Constant: 0mm/-30mm
Type: Single Prism
Color: Black and White
Prism Size: 64mm
Weight: 1Kg
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.
- 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.
- Retro-reflectors (or corner cube prisms) used with electronic
distance measuring (EDM) instruments have an offset because the
transmitted light beam from the EDM takes longer to enter and exit
the prism. This longer time translates to a longer distance
measured. This distance is corrected by using an 'offset' and
positioning the prism in relationship to the plumb line of the
prism holder. The offset is determined by multiplying the height of
the prism by the refractive index of the glass used. Common offsets
are 0, -17.5 mm, -30 mm, -34 mm, and -40 mm.
Nodal Offsets
A nodal offset is defined by the relationship of the prism holder
and prism that places the optical center of the prism on the plumb
line of the holder. This offset is the most advantageous at close
range work when the apex or center of the prism is used as a
pointing target for vertical and horizontal angle measurement.Every
prism has a nodal offset. Prisms and holders that are not in the
nodal position, however, can cause angular errors when using the
prism apex as a target if it is not perfectly pointed toward the
measuring instrument.
To reduce pointing errors, several prism assemblies are designed
with a nodal point alignment at -17.5 (for 25 mm prisms) or -40 mm
offset (for 62 mm prisms).
Commonly, the best reading of the beam is achieved when the prism
face is perpendicular to the incoming beam for a parallel return.
Unfortunately, ideal alignment is not always achieved in the field.
Company Profile
Leosurvey Instrument Co.,Ltd is a professional surveying
accessories supplier in China. Items we supply covers:
1. Prisms (reflector prism, prism set, 360 degree prism, mini
prism)
2. Prism Pole, Bipods and Tripods
3. Levelling Staff (Invar, Manganese, Aluminum)
4. Tripods (Aluminum, Wooden, Fiberglass)
5. Tribrach and Adaptors
6. Battery, cable and Chargers of different brands
7. GNSS pole and accessories
Our mission is to supply high quality and excellent service for our
customers and partners. Meanwhile, we can custom-make products for
our clients with different requirements. We are looking for
reliable distributors all around the world, welcome to contact us
for more!