Stonex R20 – User Manual 73
1. Set up the tripod and instrument stable.
2. Power on the instrument. Precisely level the instrument under the electronic level indication of {Level &
Plummet}.
3. The bubbles of the plate level and the circular level should stop right at the centre.
4. If not, use the adjusting pin to adjust related screws till the bubbles are at the center.
Check the Laser Plummet
The plummet laser spot should be checked on a bright, flat horizontal surface (e.g., on a piece of white paper). The
size of the laser spot is related to the condition of the projected surface and the ambient brightness. The average
laser spot diameter is approximate 2.5 mm when the instrument is 1.5 m high.
1. Set up the tripod and instrument stable. The instrument height is about 1.5m.
2. Power on the instrument. Level the instrument under the electronic level indication of {Level &
Plummet}.
3. In {Level & Plummet}, adjust the brightness level of the plummet laser to project a clear spot on the
ground. Mark the center of the spot.
4. Slowly rotate the instrument horizontally one turn, observe the displacement of the centre of the laser
spot.
5. If the displacement is in a clear circular motion and the diameter of the track circle exceeds 3 mm, a
calibration is required.
The laser plummet calibration needs to be carried out by an authorised service centre.
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