Preparation For Surveying; Centring And Levelling Of The Instrument; Laser Plummet - Pentax R-2501NS Instruction Manual

3. PREPARATION FOR SURVEYING

3.1 Centring and Levelling of the Instrument

[Setting up the instrument and the tripod]
① Adjust the tripod legs so that a height suitable for observation is obtained when the
instrument is set on the tripod.
② Hang the plumb bob on the hook of the tripod, and coarse centre over the station on the
ground. At this time, set the tripod and fix the metal shoes firmly into the ground so that
the tripod head is as levelled as possible.
③ If the tripod head is mis-levelled by the action of fixing the metal shoes into the ground,
correct the level by extending or retracting each leg of the tripod.
Tripod head
CentreCentre screw

3.2 Laser plummet

[Laser plummet model]
The laser plummet is not set to be ON at factory shipping. The laser plummet operation of
power supply ON can be set by command No.520, LD PLUM. & E.VIAL.
For using Command number, refer to "9.2 Accessing by 007".
[For the Detaching type laser plummet equipment model]
Turn on the laser plummet function by pushing the [Laser] key.
Match the position with the leveling screw so that the laser mark coincides with the
ground mark.
[For the Shift type laser plummet equipment model]
• Turn on the laser plummet function by pushing the [Laser] key.
• Match the position by the tripod so that the laser mark coincides with the ground mark.
• The centring knob is loosened, and the upper plate is pushed by the tip of a finger, and a
centre mark is matched to the ground mark.
• Tighten the centring knob.
• Loosen the horizontal clamp screw, rotate the instrument by 90° , and confirm the vial of
the circular vial is at the centre position.
Correct the vial with the leveling screw when the vial comes off from the centre position.
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Instrument
Base plate
Contract
Metal shoe