18-6
18 CHECKS AND ADJUSTMENTS
5) Do the calculations:
A2-A1 and B2+B1
If A2-A1 is within 180°±20
″
and B2(B1 is within 360°±40
″
,
adjustment is unnecessary.
Example:
A2-A1 (Horizontal angle) =198° 34' 20"- 18° 34' 00"
=180° 00' 20"
B2-B1 (Vertical angle)
=269° 30' 00" + 90° 30' 20"
=360° 00' 20"
If the difference is large even after repeating the check 2 or
3 times, make sure that checking and adjusting of Section
18.2 “Adjustment of Vertical Angle 0 Datum” and 18.3
“Adjustment of Compensation Systematic Error of
Instrument” are completed.
If the results remain the same, have our service
representative perform the adjustment.
18.5 Optical Plummet
•
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.
Checking
1) Carefully level the instrument and center a survey point
precisely in the reticle of the optical plummet.
2) Turn the upper part through 180° and check the position of
the survey point in the reticle.
If the surveying point is still centered, no adjustment is
necessary.
If the survey point is no longer centered in the optical
plummet, perform the following adjustment.
Adjusting
3) Correct half the deviation with the levelling foot screw.
