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DISTANCE MEASUREMENT USING STADIA LINES
The ELT 220 telescope graticule is provided with stadia lines which can be used to measure
a distance. To perform this function you need a vertical staff or similar vertical scale located
at the target/station point to be measured. By viewing the vertical staff through the tele-
scope measure the difference between the upper and lower stadia lines. This is multiplied
by 100 to calculate the distance from instrument centre to the target/station point.
AUTOMATIC POWER OFF
The Instrument will power off after 20 minutes if not used.
DISPLAYS ILLUMINATION
Switch on illumination:
Press "SFT" key for 2 sec.
Switch off illumination:
Press "SFT" key once again for 2 sec.
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∙ The vertical staff should be positioned at
the target/station point.
∙ Level the instrument. Viewing through
the telescope, measure the reading
between the two stadia lines "d" .
∙ The distance from instrument centre to
the target/station point is (D = d x 100)
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