187
14. SYSTEM SETTINGS
1, UNIT SETTING OPTIONS
Menu
Selecting Item
Contents
1. Ang. Unit
deg/gon/mil
Select degree (360°) , gon (400 G) or mil (6400 M)
for the measuring angle unit to be shown on the
display
2. Dist.Unit
Meter/Int.Feet/U.S
Feet
Select the distance measuring unit Meter, Int. Feet
or U.S Feet.
3. Temp.Unit
℃
/
℉
Select the temperature unit for the atmospheric
correction
4. Pres.Unit
mmHg/ hpa/ inHg
Select the air pressure unit for the atmospheric
correction.
2, MEASURING SETTINGS
Menu
Selecting Item
Contents
1.
Min. Ang.
Min.Dist
1″/5″/0.1″
1mm/0.1mm
Select the minimum angle reading 1″/5″/0.1″.
Select the minimum distance reading 1mm/0.1mm.
2. V-0
Zenith/Level
Select the vertical angle reading for Zenith 0 or
Horizontal 0.
3.Tilt
OFF/1axis/2axis
Select the tilt sensor option for OFF, (1axis) vertical
only or (2axis) vertical and horizontal
4. W-Corr.
0/0.14/0.20
Select the coefficient correction for refraction and
earth curvature. Selections for the refraction
coefficient are :
OFF( No Correction ) , K =0.14 or K =0.20
Correction for atmosphere refraction and the earth curvature
The instrument will automatically correct the effect of atmosphere refraction and
the earth curvature when calculating the horizontal distance and the height differences.
The correction for atmosphere refraction and the earth curvature are done by the
formulas as follows:
Corrected Horizontal Distance
：
D=S * [cosα+ sinα* S * cosα (K-2) / 2Re]
Corrected Height Differentia
：
H= S * [sinα + cosα* S * cosα (1-K) / 2Re]
If the correction of atmosphere refraction and the earth curvature is neglected, the
calculation formula of horizontal distance and the height differentia are:
D=S·cosα H=S·sinα
