58
Error table: When hPa (15°C, 1013hPa as standard)
Unit:mm
C°
hPa
1200 1100 1013 900 800 700 600 500
45 2.0 -0.5 -2.6 -5.5 -8.0 -10.5 -13.0 -15.5
35 3.0 0.4 -1.8 -4.7 -7.3 -9.9 -12.5 -15.1
25 4.0 1.4 -0.9 -4.0 -6.6 -9.3 -12.0 -14.6
15 5.2 2.4 -0.0 -3.1 -5.9 -8.6 -11.4 -14.2
5 6.3 3.5 1.0 -2.2 -5.1 -8.0 -10.8 -13.7
-5 7.6 4.7 2.1 -1.3 -4.2 -7.2 -10.2 -13.1
-15 9.0 5.9 3.2 -0.2 -3.3 -6.4 -9.5 -12.6
Error table: With mmHg (15°C, 760mmHg as standard)
Unit:mm
C°
mmHg
900 800 760 700 600 500 400
45 2.0 -1.3 -2.6 -4.6 -8.0 -11.3 -14.6
35 3.0 -0.4 -1.8 -3.9 -7.3 -10.8 -14.2
25 4.0 0.5 -0.9 -3.1 -6.6 -10.2 -13.7
15 5.2 1.5 0.0 -2.2 -5.9 -9.6 -13.3
5 6.3 2.5 1.0 -1.3 -5.1 -8.9 -12.7
-5 7.6 3.7 2.1 -0.3 -4.2 -8.2 -12.2
-15 9.0 4.9 3.2 0.8 -3.3 -7.4 -11.5
13.5 Atmospheric Refraction and Earth Curvature
Correction
●Atmospheric refraction and earth curvature correction refers to correcting both the bending
of the light beam caused by atmospheric refraction and the effect on the height differential
and horizontal distance caused by the earth curvature.
●Correction called “atmospheric refraction and earth curvature correction” is initiated to
correct error when the slope distance and vertical angle are caused to determine the
horizontal distance and the height differential, with this instrument, the following formula
is used to correct these factors.
●Calculation formula when atmospheric refraction and earth curvature correction parameter
is set to “ON”:
Corrected horizontal distance (H)
Corrected vertical distance (V)
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