telescope instruction manual R-300X series

C°

Unit: mm

[Error table: With mmHg (15°C, 760mmHg as standard)]

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)

H = S (Cosα + Sinα •

K-2

• S • Cosα )

Corrected vertical distance (V)

V = S (Sinα + Cosα •

1-K

• S • Cosα )

• Calculation formula when atmospheric refraction and earth curvature

correction parameter is set to “OFF”:

Horizontal distance H’= S • Cosα

Vertical distance V’= S • Sinα

2Re