Measurement v’s Manufacturers Data

In an ideal world vibration exposure should be measured using the exact conditions as found whilst on the jobsite; including the tool, user, material, bit or blade used, the vibration measuring equipment, the person measuring the vibration, weather conditions etc. etc.

In reality there are far too many variables which can affect the outcome of the measurement. The DEWALT view is that job site measurement is too UNRELIABLE. DEWALT recommends that manufacturers values are used for calculating HAV exposure levels providing they are specifically identified as ‘Tri-Axial’ or ‘Estimated Tri-Axial’ according to HSE guidelines and BS EN ISO 5439-1: 2001 (prEN60745-1:2005).

While this does not always exactly reflect actual usage whilst on site, it takes out a huge amount of variability. Manufacturers values must also meet international testboard requirements. DEWALT believes that this is the most reliable method of measuring vibration levels of powertools. A huge amount of work has been conducted to ensure that measurements made by DEWALT are as close to reality as possible although may not cover all eventualities. These figures can be used as a guide for calculating HAV exposure. However, if there is any doubt about the application, an independent assessment should be carried out.

[IF THE FIGURE YOU USE DOES NOT SPECIFY TRI-AXIAL OR ESTIMATED TRI-AXIAL YOU SHOULD ASSUME IT IS SINGLE AXIS AND NOT USE IT FOR HAV EXPOSURE CALCULATION.]