18-8
18 CHECKS AND ADJUSTMENTS
Checking
1) Find an area of flat ground where two points 100 m apart
can be selected.
Set up the Instrument at point A and the reflective prism at
point B. Establish a point C half way between points A and
B.
2) Precisely measure the horizontal distance between point A
and point B 10 times and calculate the average value.
3) Place the GM at point C directly between points A and B
and set up the reflective prism at point A.
4) Precisely measure the horizontal distances CA and CB 10
times each and calculate the average value for each
distance.
5) Calculate the additive distance constant K as follows.
K = AB - (CA+CB)
6) Repeat steps 1 to 5 two or three times.
If the additive distance constant K is within ±3 mm even
once, adjustment is unnecessary.
If it always exceeds this range, have our service
representative perform an adjustment.
18.7 Checking and Adjusting of Laser Plummet
*1
Checks and adjustments are performed using an adjustment target. Make an enlarged or reduced copy
of the figure below.
*1: Laser plummet is available as a factory option depending on the country or the area where the
instrument is purchased.
Checking
1) Set the tripod so that the height from the ground to the
tripod head is approximately 1.3 m, level the instrument,
and emit the laser plummet beam.
see Section 2.5.2 “Levelling”.
2) Rotate the upper part horizontally and place a target so that
it is aligned with the center of the circle created by the
rotating laser plummet beam.
•
Laser beam remains centered on the center of the
target – No adjustment necessary
•
Laser beam strays from the center of the target –
Adjustment necessary.
•
Laser beam draws a circle outside the target circle –
Contact your local dealer.
5 mm
