Civil Engineering: Total Station Preparation before Measurement

Preparation before Measurement

Setting up the instrument:

(1) Set up the tripod first: extend the extension legs to suitable lengths and tighten the screws on the legs.Make sure the legs are spaced at equal intervals and the head is approximately level. Set the tripod so that the head is positioned over the surveying point. Make sure the tripod shoes are firmly fixed in the ground.

(2) Attaching the instrument on the tripod head: mount the instrument carefully on the tripod head. Supporting it with one hand, tighten the centering screw on the bottom of the unit to make sure it is secured to the tripod.

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Levelling-Up:

(1) Basic Levelling-Up with the circular level

1). Move the foot screws A and B in opposite direction till

the circular bubble is perpendicular to a line shaped with

screw A and B. The direction of

rotation in left thumb indicates the

movement of the circular bubble.

2). Move the bubble to the center of the circle by turning

(2) Accurate Levelling-Up with plate level

1). Loosen the horizontal motion clamp, and turn the instrument till the plate level is parallel to a line shaped with screws A and B. Adjust the screws A and B to make the bubble in the center of the level.

2). Loosen the horizontal motion clamp, and turn the
instrument approximately 90°.Adjust the screw C until the bubble in the center of the level.

3). Repeat above steps until the bubble remains in the

center of the plate level while the instrument is

rotated to any position.

(3) Accurate Levelling-Up with Electronic Level on the screen

It is convenient for W-1500 N series to level-up with electronic level, especially when it is difficult to observe the circular level and plate level.
Firstly, press the key 【★】 to turn on the electronic bubble as shown in left figure.On the electronic bubble screen, five function keys are displayed in the left column, which are listed as follows:

【TiltXY】dynamic display of electronic bubble

【T.P】observation and setting of temperature and atmospheric pressure

【Target】target condition of surveying

【Battery】dynamic display of battery level

【Exit】exit the electronic bubble screen

Secondly,level it by turning three foot screws and ensure the bubble is in the plate level.Make sure the red spot is in the center.

Note:

As shown in the right figure, you can realize transformation of compensation options by pressing the lower right button.

【XYON】compensate horizontal angle and vertical angle at the same time

【XONYOFF】just compensate X axis

【XYOFF】don’t compensate X axis and Y axis

【A.OFF】don’t compensate X axis and Y axis,and turn off the popup function of electronic bubble.

In PENTAX Field Genius software, the Level display is always shown as left figure.

(4) Centering

Centering with Laser Plummet:

Press the key 【★】 to enter into the display as shown in the left figure.

Operation Steps:

① Click the “target” button and you can turn on laser plummet and set it as three levels of brightness. Thus, that laser emits downwards can be seen.

② Loosen the center screw of tripod, and move the base plate on tripod head until the laser spot coincides with ground mark point. Then tighten the center screw.

③ Repeat leveling and two steps until the instrument keeps leveling and the laser spot coincides with ground mark point when rotating "alidade" of instrument in any direction.

④ After centering is finished, turn off laser plummet for power saving.

For "Instrument settings" read next Post.

Thanks for Reading

Civil Engineering

Wednesday 31 January 2018

Total Station Preparation before Measurement