Checks And Adjustments; Circular Level; Tilt Sensor - Sokkia im-101 Operator's Manual

35.CHECKS AND ADJUSTMENTS

A iM is a precision instrument that requires fine adjustments. It must be inspected and adjusted before use so
that it always performs accurate measurements.
• Always perform checking and adjustment in the proper sequence beginning from "35.1 Circular Level" to
"35.7 Laser Plummet *1".
• In addition, the instrument should be inspected with special care after it has been stored a long time,
transported, or when it may have been damaged by a strong shock.
• Make sure the instrument is securely set up and stable before performing checks and adjustments.

35.1 Circular Level

PROCEDURE Checking and adjusting
1. Level while checking the display.
"7.2 Levelling"

• If the tilt sensor is misaligned, the circular level is not
adjusted correctly.
2. Check the position of the bubble of the circular level.
If the bubble is not off-center, no adjustment is necessary.
If the bubble is off-center, perform the following adjustment.
3. First confirm the off-center direction.
Use the hexagonal wrench (2.5 mm) to loosen the circular
level adjustment screw on the side opposite to the direction
the bubble is displaced to move the bubble to the center.
4. Adjust the adjusting screws until the tightening tension of
the three screws is the same to align the bubble in the
middle of the circle.

• Be careful that the tightening tension is identical for all the adjusting screws.
• Also, do not over-tighten the adjusting screws as this may damage the circular level.

35.2 Tilt Sensor

If the tilt angle shown on the display shifts from tilt angle 0° (zero point), the instrument is not correctly levelled.
This will adversely affect angle measurement.
Perform the following procedure to cancel the tilt zero point error.
PROCEDURE Checking
1. Carefully level the instrument. If necessary, repeat the
procedures to check and adjust the bubble levels.
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