Daily vibration exposure A(8) = a × √(T/8) It is determined as follows (a: vibration magnitude m/s², T: hours). Values (2002/44/EC): hand-arm EAV 2.5 / ELV 5.0 m/s²; whole body EAV 0.5 / ELV 1.15 m/s². For example, hand-arm at 3.5 m/s² for 4 hours → A(8) ≈ 2.47 m/s².
A(8) = a × √(T / 8) [m/s²]
Example calculation: Arm vibration 3.5 m/s², 4 hours → A(8) = 3.5×√(4/8) ≈ 2.47 m/s² → very close to action value (2.5); should be monitored.
Vibration Exposure A(8)
Calculate daily vibration exposure normalized to 8 hours from vibration magnitude and exposure time; compare with action/limit values.
A(8)
–
Action Value (EAV)
–
Limit Value (ELV)
–
Notes: A(8) = a × √(T/8). Values (Vibration Directive / 2002/44/EC): hand-arm EAV 2.5 – ELV 5.0 m/s²; whole body EAV 0.5 – ELV 1.15 m/s². This is for a single source; a combined account is required for different jobs. Measurement is performed using the ISO 5349 (hand-arm) / ISO 2631 (whole body) method.
How is it calculated?
- Select the vibration type (hand-arm / whole body).
- Enter the vibration magnitude as a (m/s²).
- Enter the exposure time (in hours) and click Calculate.
Frequently Asked Questions
What is the vibration exposure limit?
According to 2002/44/EC, the action value for the hands and arms is 2.5 and the limit value is 5.0 m/s²; for the whole body, the action is 0.5 and the limit is 1.15 m/s².
What does A(8) represent?
It is daily vibration exposure normalized to an 8-hour reference period; it makes different durations and magnitudes comparable.
What happens if the action value is exceeded?
A vibration reduction program is implemented, health surveillance is initiated, and employees are informed.
Related tools and services
This tool and its content are for general informational purposes only; they do not constitute a binding inspection/declaration of conformity. Definitive results will be determined through on-site inspection in accordance with relevant legislation and standards. Get a quote →