Product Manual

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130°F
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16
[ ft ]
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 inch Hg
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 inch Hg
16000 15000
14000
13000
12000 11000 10000
9000 8000 7000 6000 5000
4000
3000 2000
1000
o ft
-15
-20
-25
-30
-35
-40
-45
-50
-55
-10
-5
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
130
135
140
145
15.8 Reduction Formulas
c
a
b
SD
VD
HD
a Mean Sea Level
b Instrument
c Reflector
SD Slope distance
HD Horizontal distance
VD Height difference
The instrument calculates the slope distance, horizontal distance, and height difference in
accordance with the following formulas. Earth curvature (1/R) and mean refraction coefficient (k
= 0.13) are automatically taken into account when calculating the horizontal distance and height
difference. The calculated horizontal distance relates to the station height and not to the reflec-
tor height.
Slope distance
SD
= D
0
· ( 1 + ppm · 10
-6
) + p
SD Displayed slope distance [m]
D0 Uncorrected distance [m]
ppm Atmospheric scale correction [mm/km]
Formulas
134 Technical Data