Leica Geosystems TPS1100 Professional Series - User Manual - Manual (Page 45)

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TPS1100 - User Manual 2.2.1en Checking and adjusting
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Checking by plumb-bob:
Optical plummet
Checking by turning the tribrach Adjustment
Set-up and level the instrument on
the tripod. Check the centring sleeve
for eccentricity by hanging it in place
in various positions, then mark the
ground point. Remove the plumb-
bob. Check that the crosshairs of the
optical plummet intersect at the
ground point. The accuracy
achievable is about 1mm. Use a screwdriver to turn the two set
screws alternately by the same small
amount in order to centre the
crosshairs on the ground point
marked.
Inspect the optical plummet
of the tribrach regularly,
because any deviation of its line of
sight from the vertical axis will result
in a centring error.
1. Level-up the instrument using the
electronic bubble. Mark the ground
point. Using a soft, well-sharpened
pencil, mark the outline of the
tribrach on the tripod plate.
2. Turn the tribrach 120 ° and level-
up the instrument, fit it into the
outline, and again mark the ground
point.
3. Repeat again in the third position.
If the three points do not coincide,
adjust the crosshairs to the centre of
the triangle formed by the three
ground points.
1100Z25
2 1 3
120° 120°
1100Z26
1100Z27