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3-2-2 Calibrate G Value Used in Local or in Verification
It is capable for users to set or modify G value for 9 times. If it is the 10
th
revised G value,
please enter
“06 CGr” to calibrate local G value, and the calibration time will be re-set as “1”.
Local G value calibration must be done after external weight calibration.
If the external weight calibration is done after G value calibration, the previous G value will be
set as the value used in verification.
G value modify calculation
G value is the reaction of centrifugal force for free falling object.
Standard G value for equator on earth surface:
G
E
＝
978.03184558 cm/sec
2
= 9.7803184558 m/sec²
Standard G value 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.
G value 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
G value must between 9.78032 m/sec² to 9.83218 m/sec
2
.
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