AMO (arrow speed)

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Will someone please explain to me how the AMO (arrow speed) is figured or measured?

Thank you.

[hondakid]

Here are the classifications for AMO & IBO.

A.M.O.
Under this standard the bow being tested will have a maximum pull weight of 60lbs. The arrow will have a grain weight of 540(9 grains of arrow weight per pound of bow weight). The draw length will be set at 30 inches. The chronograph used for measuring the speed will be placed at point blank range for testing.

I.B.O.
Under this standard the bow being tested will have a maximum pull weight of 70lbs. The arrow will have a grain weight of 350(5 grains of arrow weight per pound of bow weight). The draw length will be set at 30 inches. The chronograph used for measuring the speed will be placed at point blank range for testing.

[insearchof]

Thank you for that info.