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23.CHECKS AND ADJUSTMENTS
SRX 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 "23.1 Plate Level"
to "23.8 Additive Distance Constant".
• 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.
The bubble tube is made of glass, so it is sensitive to temperature changes or to shock. Check and
adjust it as outlined below.
PROCEDURE Checking and adjusting
1. Level the instrument and check the position of the
bubble of the plate level.

"9.2 Levelling", steps 3 to 5
2.
Turn the upper part of the SRX through 180° and
check the bubble position.
If the bubble is still centered, no adjustment is
necessary.
If the bubble is off-center, adjust as follows.
3. Correct half of the bubble displacement using
levelling foot screw C.
4.
Correct the remaining half of the displacement by
using the adjustment pin to rotate the plate level
adjustment screw.
When the plate level adjustment screw is turned in
the counterclockwise direction, the bubble moves
in the same direction.
5.
Rotate the top of the instrument and continue
adjustments until the bubble remains centered for
any position of the upper part.
If the bubble does not move to the center even
when the adjustment has been repeated, ask your
Sokkia agent to adjust it.
23.1 Plate Level