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212TPS1200
Technical Data
Formula The instrument calculates in accordance with the following formula:
• slope distance
• horizontal distance
• height difference
Earth curvature and mean refraction coefficient k = 0.13 are taken into account auto-
matically. The calculated horizontal distance relates to the station height, not to the
reflector height.
Displayed slope distance [m]
D
0
Uncorrected distance [m]
ppm Scale correction [mm/km]
mm Additive constant, prism [mm]
Horizontal distance [m]
Height difference [m]
Y * |sinζ|
X * cosζ
ζ Vertical circle reading
A (1 - k/2)/R = 1.47 * 10
-7
[m
-1
]
B (1 - k)/2R = 6.83 * 10
-8
[m
-1
]
k0.13
R 6.378 * 10
6
m
TPS12_058
= D
0
· ( 1 + ppm · 10
-6
) + mm
TPS12_059
= Y - A · X · Y
TPS12_060
= X
+ B · Y
2