South ET-05 Electronic Digital Theodolite Manual - New England ...

5.4 Vertical Index Zero Setting (V 0SET)
operation display
Turn on the instrument. Displaying ―b‖ means that
the vertical axis is not vertical. If the instrument is
leveled exactly, ―b‖ will disappear.
After the instrument is leveled exactly, turn on the
instrument and it displays ―V 0SET‖ which means
that the vertical index has been set to zero.
Turn the telescope up and down in normal position
in horizontal direction. Vertical index zero is set
when the telescope passes level and the vertical
angle is displayed. The instrument is now ready
for angle measurement.
If vertical index automatic compensation set is used, the vertical index can be
compensated. When the vertical index is beyond the designed criterion, “b” will be
displayed. Level the instrument precisely until “b” disappears. Then the instrument
gets its breath again.
If no operation is performed in 10 or 30 minutes. The power will be turned off
automatically due to “power auto off function” and the horizontal angle will be stored
in memory automatically.
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