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PREPARATION FOR MEASUREMENT
Mounting And Leveling
Mount and level the instrument carefully to get the best performance.
1. Place the tripod over the ground datum point and tighten the legs.
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3. On the DGTA-5, roughly level the instrument with the circular vial.
A) Use level screws "A" and "B" to move the air bubble in the circular vial so it is
centered left to right. (Fig. 4)
B) Use level screw "C" to move the air bubble to the center of the vial. (Fig. 5)
4. Fine tune level the instrument with the plate level:
A) Turn the instrument until the plate level is in either one of the positions shown. Then use the
"A" and "B" level screws to center the bubble in the level. (Fig .6)
B) Turn the instrument 90° (100 g) and center the air bubble in the vial using level
screw "C". (Fig .7)
C) Repeat steps A and B until the level stays centered in any direction. If the plate level will not
stay centered, see section 5.2 to adjust the vial.
5. Centering the instrument using the
A) Adjust the eyepiece so the bull's-eye reticle comes into sharp focus. (Fig .8)
B) Adjust focus knob so ground target comes into sharp focus. (Fig 8)
C) Slightly loosen the tripod fastening screw and move the instrument until the ground target is
centered in the optical plummet. (Fig .9)
D) Tighten the tripod fastening screw and recheck the level vials by following steps 3 and
4 again. (Fig .10)
Telescope Eyepiece Focus
Point the telescope toward a bright area and turn the telescope eyepiece until the crosshairs
come into sharp focus.
Avoid parallax, the shifting seen between the target and the crosshairs when your eye
moves while sighting through the telescope. Parallax will cause inaccurate measurements.
To avoid parallax, perform the following:
1. Focus the telescope on a target.
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