AASHTO R 33-03 (2008) PDF
Standard Recommended Practice for Calibrating the Reference Load Cell Used for Reference Calibrations for Falling Weight Deflectometer
standard by American Association of State and Highway Transportation Officials, 08/01/2008
The reference load cell is a precision instrument that requires regular and thorough calibration.
It is essential that the reference load cell be calibrated using a testing machine that is properly maintained and accurately calibrated.
The reference load cell and its cable, and the associated signal conditioner are considered a system of instruments, which are to be calibrated together and used together.
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