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13. CHECKS AND ADJUSTMENTS
3. Shift the vertical cross-hair line and align it with point D,
by revolving the left and right capstan adjustment
screws with the hexagonal wrench* (or adjusting pin).
Upon completing the adjustment, repeat the checking
operation once more.
If points B and C coincide, further adjustment is not
required. Otherwise, repeat the adjustment.
* DT-302/305/307/309F/309G: Hexagonal wrench
DT-305L/307L/309LG: Adjusting pin
• First, loosen the capstan adjustment screw on the side to which the vertical cross-hair line must be moved.
Then tighten the adjustment screw on the opposite side by an equal amount which will leave the tension
of the adjustment screws unchanged.
Revolve in the counterclockwise direction to loosen and in the clockwise direction to tighten, but revolve
as little as possible.
Perform "13.6 Vertical Angle 0 Datum" after completing above adjustment.
• Be careful that the tightening tension is identical for all the adjusting screws.
PROCEDURE Checking
1. Carefully level the instrument and center a survey point
precisely in the reticle of the optical plummet.
2. Turn the upper part through 180° and check the position of
the survey point in the reticle.
If the surveying point is still centered, no adjustment is
necessary.
If the survey point is no longer centered in the optical
plummet, perform the following adjustment.
PROCEDURE Adjusting
1. Correct half the deviation with the levelling foot screw.
2. Remove the optical plummet reticle cover.
13.5 Optical Plummet
Capstan
adjustment
screw
Eyepiece
Capstan
adjustment
screw
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