Metal 38.1mm Total Station Survey 20mm Prism Total Station Reflector

ADSmini106 Mini Prism 0/-30mm with poles for Topcon Sokkia Total Station Prism

Model: ADSmini106

Specification:

Overview:

Mini prism set for Topcon Sokkia and other total stations.

With Metal Holder

0/-30mm Offset

Prism diameter 25.4mm

Introduction:

This prism set includes a 38.1mm silver coated prism, three 60cm length pole sections-in red and white, 10cm stripes (total length 1.8m).

The prism can be mounted in a 0mm offset position.

This kit also comes with a padded carrying case and a plumb bob hook, and cap for prisms to use as offset prism by itself.

Prism

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.

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. Leosurvey prism accuracy is 1 mm or less.

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.