Checks And Adjustments; Adjustment Precautions; Checking And Adjusting; The Plate Vial - David White DWT-10 Instruction Manual

5. CHECKS AND ADJUSTMENTS

5.1 Adjustment Precautions

When attempting to check and adjust an instrument, corrections must be done in a
certain order or the adjustments will not be correct.
Order of adjustment:
1. Check and adjust the plate vial.
2. Check and adjust the circular vial.
3. Check and adjust the optical plummet.
Always recheck your adjustments. We recommend that
any adjustments, other than those shown, be done by a
qualified Instrument repair technician.

5.2 Checking And Adjusting

1. The plate vial

A) Place the plate vial parallel with the level
screws, A and B. Center the bubble using these
two level screws.
B) Turn the instrument 90° and center
the bubble using level screw C.
C) Return to the original position in step A. Recheck the bubble and center as neces-
sary. Rotate the instrument 180° (200g). The bubble should still be centered in the vial.
If not, go to step D.
D) Using the adjusting pin provided in
the case, turn the screw until the
bubble moves halfway back to its
original position.
E) Return the instrument to its original
position follows steps A through C.
Repeat these steps until the bubble
stays centered in all positions.

2. The Circular Vial

Part 1, adjusting the plate vial, should have been done
prior to this step.
If the circular vial is centered after leveling the plate vial,
then no further adjustment is necessary. If not, proceed
with the following adjustment.
Using the adjusting pin provided in the case, turn the
adjusting screws until the bubble is centered in the vial.
DO NOT OVERTIGHTEN THE ADJUSTING SCREWS.
Loosen one screw 1/4 turn, then tighten one
screw 1/4 turn.
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