Johnson-level-tool-mfg 40-6963 User Manual download pdf (Page 6)

5. Calibration

5.1 Compensator Check Button

Check the compensator for proper operation before use or anytime

the operation of the instrument is in question. Push and release the

compensator check button to shake the compensator. The compen-

sator should return to the exact horizontal position sighted before the

check button was pressed.

5.2 Circular Bubble Vial

Center the vial bubble using the leveling screws, then rotate the

instrument 180º. The bubble should remain centered (F

ig. 3). If the

bubble moved from the center, the vial needs adjustment (Fig. 4).

Turn the leveling screws to bring the bubble halfway to center (Fig. 5).

Using the allen wrench, turn the two vial adjustment screws to center

the bubble (Fig. 6).

Repeat the above procedure until the bubble remain centered when

the level is rotated 180º.

Fig. 3 Fig. 4

Fig. 5

Fig. 6

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Johnson-level-tool-mfg 40-6963 User Manual Page 6