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target as observer moves slightly. Otherwise, repeat the above steps until there is
no parallax.
4.3 Upward
(1) Optical plummet
Leveling the instrument, make the index points to zero graduation first, then read
out the first point. Then rotate the instrument through 180 and read out the
second point, take the average of these two points as final result. Repeat above
step could keep the accuracy of survey.
(2) Laser plummet
Switch on/off
Switch on the upward laser switch, one laser beam will emit through the
telescope, focus the laser spot on the laser
target,
read out the point. Repeat the
step as optical plummet, it could keep accuracy of survey. Use technique of laser
plummet is same with upward laser.
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