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The reason for the error in static measurement is actually on the pedestal. The inspection of the base requires three aspects, one is the coarse flat round bubble, the other is the fine flat long bubble, and then the point pointer.
1. Round bubbles
1. Check the centering
Rotate the instrument 180° and if the blister changes and is no longer in the center of the circle, the round blister must be corrected.
2. Adjustment
Firstly, the offset blister is displaced by half to the center of the circle by rotating the foot spiral, and the other half of the offset needs to be corrected by the correction screw inserted into the round blister by the calibrator.
When the correction screw is tightened, the blister moves towards the tightened screw, and when the screw is loosened, the blister moves in the opposite direction.
One of the screws of the first school is the one closest to the center of the blister that connects the center of the circle, and the one that connects the blister to the center of the circle or with the help of another screw.
After the correction is completed, check again whether the round blister is centered, and if there is still an offset, repeat the above correction process until the blister is centered.
Second, long horizontal bubbles
1. Check the centering
After the blister is centered, the instrument is rotated 180°, and if the blister changes and is no longer in the center of the blister, the long blister must be corrected.
2. Adjustment
Turn the horizontal bubble in one direction, spiraling parallel to one of the two feet of the base.
Then turn the two foot spirals so that the long bubbles are precisely centered.
Rotate the long bubble 180° to the opposite position to see if the long bubble is still accurately centered, if there is a deviation, you need to adjust the fixing screw at one end of the long bubble, loose or tight.
Generally, adjust the position of 1 2 deviation of the bubble, and then use the foot spiral to adjust the bubble to the center.
Rotate 180° to look at the opposite side, and if the blister is not centered, repeat this step until the two directions are completely centered.