Local Gravity Value Setting - Excell BH3 Service Manual

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
saved as the 1
The gravity value should be among the value of Equator and Polar.
Equator gravity G
Polar gravity G
≒
Taipei 9.78914 m/sec
Gravity value formula:
Equator gravity
Polar gravity
G＝978.03185（１＋0.005278895sin
Helmert's formula:
G＝ 9.80616 - 0.025928cos2ψ＋ 0.000069 cos
Northern
latitude
G = 9.80616-0.016666197+0.00002850913787-0.000003086H
BH3 Series
st
batch data and clear all the history data.
= 9.7803184558 m/sec
E
= 9.8321772792 m/sec
P
2
＝978.03184558cm/sec
G
E
＝983.21772792cm/sec
G
p
G: m/sec
25°
= 9.789465294 – 0.000003086H
function, the new input value would be
2
2
≒
Shanghai
2
2
2
ψ＋0.000023462sin
G : cm/sec
2
2ψ- 0.000003086H
2 ψ
latitude
: H:
51
2
9.79423 m/sec
4
ψ）
ψ
2
latitude
:
altitude
(meter)
Data souce: A&D