8
OL28X
TM
OPERATING INSTRUCTIONS cont.
www.redbacklasers.com.au
Distance Estimation with the OL28X
The OL28X can be used to estimate distances between the unit and the staff
with the use of the “Stadia” lines whilst looking through the eyepiece.
By using the plumb bob hanging from under the locking screw of the tripod
the exact position of the dumpy level can be marked on the ground. Next
set the staff up at the point that you want to estimate the distance to and
look through the eyepiece. Note the number of centimeters on the staff
between the top and bottom stadia lines (short lines see page5), multiply
this measurement by 100 and you have the distance between dumpy and
staff in centimeters. e.g. 5cm x 100 = 500cm which is 5m In other words
whatever you read in centermetrs is the distance in meters.
5cm
5m
Summary of Contents for ol28x
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