Nikon NPL-352 Manual - Página 12

Procurar online ou descarregar pdf Manual para Instrumentos de medição Nikon NPL-352. Nikon NPL-352 12 páginas. Unswitched

FEMA US&R Response Sys/U.S. Army Corps of Engineers

STRUCTURES SPECIALIST SKILLS TRAINING

October 2007

TST – Total Station Training

It is necessary to establish a reference point to

set as the position of the zero horizontal angle.

This is commonly referred to as the Backsight

(BS) although the BS may be, and often is,

located forward of the instrument location.

The horizontal angle is set to zero through the

Angle menu which is accessed by pressing the

ANG key. Scroll to the 0-Set option and press

the REC/ENT key or press the 1 key. This will

set the current orientation of the telescope as

the zero horizontal angle.

Points to be monitored are sighted and their HA

and VA recorded on monitoring forms or field

books. Field books with waterproof paper are

recommended.

Once the HA and VA are known, the points can be monitored by turning the

telescope back to their last recorded location using the tangent screws of the

instrument until the output screen of the instrument has the desired readings.

After returning the instrument to the prior recorded HA and VA settings, the

object is sighted through the telescope and movement can be immediately

ascertained by seeing if the crosshairs of the telescope are still centered on the

point being monitored. It should be noted that the accuracy of a 5 second

theodolite or total station is approximately 1/8" for a point 400 feet distant.

Although the NPL-352 is rated as a 5 second machine, its performance is

always better than this. This level of accuracy should be more than sufficient

for the purposes of monitoring points in the US&R environment.

Measurement Basics and Theodolite Use Page 12