Hi all, can anyone tell me what the difference is in these and which one would you use as the manufacturers data? Vibration (ISO-8662-12) 4 m/s² Vibration-ISO-28927-8_ms2 <2,5 m/s² Vibration-K-ISO-28927-8_ms2 - m/s² This information is for a CP7901 and has been taken from the http://www.cp.com/en/wha...o/powertools/ecatalogue/ web site

The ISO numbers relate to the standards for the method of testing vibration for that particular tool. The 'K' value is the measurement of 'uncertainty' of the measured vibration emission. As an example the manufacturer tests and finds the vibration value is 4 m/s 2 known as the 'a' value, but the 'K' measurement is 2 m/s 2, so the actual value is 'a' + 'K' = 6 m/s 2. However, as Smitch says, there is no value against 'K' in your tool information. Sorry not to be able to help more. Lisa

SPR, I’m no expert. However, my 2p worth would be: You are looking to use a bit of kit an air reciprocating saw, (CP7901). The information on the web site offers three vibration guides. Vibration (ISO-8662-12) 4 m/s² Vibration-ISO-28927-8_ms2 <2,5 m/s² Vibration-K-ISO-28927-8_ms2 - m/s² ISO means International Organisation for Standardisation. ISO, from the Greek word meaning equal. In that all readings using this standard are equal. Another example ISO 14001. The same equal standard used against all organisations for the environment accreditation. The numbers are scaled 1 to 10, for example (they do go a lot higher). The numbers marry the m/s2 (for metres per second squared). This is the measurement of the magnitude at which the bit of kit vibrates. Your question is which one do you use. Or which of the three measurements do you use for risk assessment? The answer is the first one. Why, it (or the standard relates to reciprocating saws, which is what you have. The other 2 relate to other bits of kit. However, as mentioned that standard has been replaced with ISO 28927-8:2009. So you cannot use it but if it were still in play you would. Now if you take the new standard into consideration, that being ISO 28927-8:2009. This is the ‘test method’ used to define the methods for the measuring of vibration. It will not tell you the number you need. Duly, I would still revert back to the fist measurement and use that one. Ie 4m/s2. Why? Well this is the one it was benchmarked against and without as calibrated tool to measure the magnitude this is as good as it gets. So, plug 4 m/s2 into the HSE calculator and you’ll get: 3 hours 8 minutes till the EAV 12 hours 30 minutes to the ELV These are all ‘trigger time’ related. Like I said, I’m no expert but going on what you have said and with out the use of a tool for measurement I would use 4 m/s2 based on the info provide. Hope this makes sense…