Optical Plummet Survey Total Station Part 20mm Circular Prism

Nikon Type Prism Reflector Set for Total Station ADS18

Model: ADS18

Specification:

Features:

This complete tilting prism assembly comes with a 64mm prism mounted in a sealed canister, a metal 5.5′ x 7′ fluorescent orange target, and a metal yoke.

The prism can either be mounted in a -30mm or zero offset position.

Locking knob in back of the prism locks the prism and target in the desired tilting position.

Prism Set Comes with a protective hard plastic carrying case.

Centring Accuracy
Measurement errors occur if Original prism holders are not used. Substitutes are not configured and often exhibit displacement between prism, holder and recording pin. The holder and the prism constitute a unit with which the centring and repeat accuracy is defined. The smallest dimensional change in the geometry of a glass prism or on the holder can lead to a deviation from the centring axis and thereby create measurement errors.

Range
The beam deviation of a prism defines the its maximum range, according to the principle "entering beam should equal the exiting beam". The smaller the beam deviation (measured in angle seconds), the greater the directly reflected signal strength to the sender optic. The returned signal quality defines the maximum range of a measurement.

Lifetime
In contrast to many conventional prisms, the reflective copper coating on the reverse side of Original prisms consists of a support coating, a vacuum-metallised copper coating, a protective coating and an overlying coat of lacquer. The special adhesive lacquer protects the underlying layers from corrosion and detachment. Working together, the copper coating and the lacquer increase the life of the prism significantly. An additional anti-reflex coating on the sensitive front surface of the prism provides a tough resistance to scratches. The production process of these coatings is so complex that only a very few manufacturers worldwide meet the requirements of Leica original prisms.