BH3 Series
51
EXCELL PRECISION CO., LTD.
4-5 LOCAL GRAVITY VALUE SETTING
Manufacture gravity value is in the 00 batch.
Local gravity could be input for 9 times.
To input the local gravity value in function, the new input value would be
saved as the 1
st
batch data and clear all the history data.
The gravity value should be among the value of Equator and Polar.
Equator gravity G
E
= 9.7803184558 m/sec
2
Polar gravity G
P
= 9.8321772792 m/sec
2
Taipei 9.78914 m/sec≒
2
Shanghai 9.79423 m/sec≒
2
Gravity value formula:
Equator gravity G
E
＝978.03184558cm/sec
2
Polar gravity G
p
＝983.21772792cm/sec
2
G＝978.03185（１＋0.005278895sin
2
ψ＋0.000023462sin
4
ψ）
G : cm/sec
2
ψ: latitude
Helmert’s formula:
G＝ 9.80616 - 0.025928cos2ψ＋ 0.000069 cos
2
2ψ- 0.000003086H
G: m/sec
2
ψ: latitude H: altitude (meter)
Northern latitude 25°
G = 9.80616-0.016666197+0.00002850913787-0.000003086H
= 9.789465294 – 0.000003086H
Data souce: A&D
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