1. Assessment of exposure
(a) The assessment of the level of exposure to hand-arm vibration is based on the calculation of the daily exposure value normalised to an eight-hour reference period A(8), expressed as the square root of the sum of the squares (rms) (total value) of the frequency-weighted acceleration values determined on orthogonal axes ahwx, ahwy, ahwz as defined in Chapters 4 and 5 and Annex A to ISO (International Organization for Standardization) Standard 5349-1 (2001).
(b) The assessment of the level of exposure may be carried out on the basis of an estimate based on information provided by the manufacturers concerning the level of emission from the work equipment used and based on the observation of specific work practices or on measurement.
2. Measurement
When measurement is employed in accordance with Regulation 136 -
(a) the methods used may include sampling, which must be representative of the personal exposure of an employee to the mechanical
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