User guide

10 Checking and Adjustment
116 Trimble M3 Total Station User Guide
Increased strain placed on the instrument by extreme measuring conditions,
transportation, prolonged storage and major changes in temperature may lead to
misalignment of the instrument and faulty measuring results. Such errors can be
eliminated by instrument adjustment or by specific measuring methods. This section
will guide you through such adjustments.
10.1Checking and adjusting the plate level
The axis of the plate level vial must be at right angles to the vertical axis of the
instrument.
To check and adjust the plate level:
1. Set up the instrument on the tripod.
2. Follow the leveling procedures described in
Leveling, page 49.
3. Rotate the alidade 180°.
4. Check whether the bubble is in the center of the vial.
5. If the bubble is not in the center of the vial, adjust the plate level:
a. Using the adjusting pin supplied, rotate
the plate level’s adjustment screw until
the bubble has moved half of the
distance back to the center.
b. Using leveling screw A, move the
bubble into the center of the vial.
6. Repeat from Step 4.
10.1Checking and adjusting the circular level
Once you have checked and adjusted the plate
level, check the circular level.
If the bubble is not in the center of the level, use the
adjusting pin to rotate the three adjustment screws
until the bubble is centered.
CB
A
2