S9 HP total station EDM

The S9 HP total station’s EDM is a laser distance unit based on the phase comparison method. The distance unit is coaxial with the line of sight and transmits an intensity modulated optical measuring beam that is reflected by a prism or scattered by a natural surface on which the beam is directed. The phase difference between the transmitted light and the reflected received light is detected and represents the distance.

In prism-mode, the High Precision unit operates as a fast and precise long-range distance meter. In DR-mode, the High Precision unit transmits a collimated visible red laser beam to the target point and then calculates the distance between the transmitted and the received light.

The DR Standard distance unit software will detect erroneous single distance measurements such as those caused by an obstruction passing through the measurement beam, and will ignore such readings in the computation of the final distance.