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This note provides an example of an energy calibration report on standard penetration test equipment. This calibration was designed to determine a standard hammer drop height that would produce 2100 in.·lb (237 N·m) of compression wave energy entering the drill rods as a result of the average hammer blow when using drop procedures as ordinarily used for the rig under calibration.
Professor of civil engineeringMember of ASTM, University of Florida, Gainesville, Fla.
Law Engineering Testing Co., Jacksonville, Fla.
Soil materials and research engineer, Florida Department of Transportation (DOT), Gainesville, Fla.
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