49
EXCELL PRECISION CO., LTD.
ZSME200000051
3-2-2
Gravity Adjustment
It’s capable for users to reset and modify gravity for 9 times. If it’s the 10
th
revised gravity
calibration, it needs to enter into to redo the “gravity calibration in
operation location,” and the calibration time will be re-set to “1”.
Gravity adjustment in operation location must be done “after” external weight calibration.
If the external weight calibration is done before gravity adjustment, the previous gravity
value will be set as the value of operation location of external weight calibration.
Gravity Value Modify Calculation
Gravity, the accelerated speed “G”, is the reaction of centrifugal force for free falling object.
Standard gravity for the equator on earth surface:
G
E
＝
＝＝
＝978.03184558 cm/sec
2
= 9.7803184558 m/sec²
Standard gravity for polar region:
G
p
＝
＝＝
＝983.21772792 cm/sec
2
= 9.8321772792 m/sec²
The G value below ground is the object's free fall acceleration at that location.
Gravity does not decrease gradually from mantle to the earth's core. Gravity in the mantle
will reaches its highest value (about 1021 cm/ sec²), and decreases to 0 at the earthe's
core.
Standard gravitation acceleration in different latitude (ψ) can be calculated by formula
described as bellowed descriptions:
G＝
＝＝
＝978.03185（
（（
（1+0.005278895sin
2
ψ+0.000023462sin
4
ψ）
））
）
G: cm/sec
2
ψ: Latitude
Gravity must between 9.78032 m/sec² to 9.83218 m/sec
2
.
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