This test is divided into three types according to the hammering energy: light, heavy and heavy. Light power penetration is suitable for general clay soil and plain fill soil; heavy power penetration is suitable for medium, coarse, gravel and stone soil; super heavy penetration is suitable for dry pebbles and gravel soil.
SL 237-047-1999 history
1999SL 237-047-1999 Code for test of soil - dynamic penetration test