Communiquez avec les autres et partagez vos connaissances professionnelles

Inscrivez-vous ou connectez-vous pour rejoindre votre communauté professionnelle.

Suivre

How to calculate uncertainty according to requirements of ISO 17025?

user-image
Question ajoutée par Mohamed Soltan , exeutive director , wleedpack company
Date de publication: 2016/05/04
Ageelan Ramajindrun
par Ageelan Ramajindrun , Production Manager , Aladdin Pacific (M) Sdn Bhd

Hi Mohamed Soltan,

 

To answer your question, firstly ISO 17025 requirements does not specify that you need to use specific method of calculation. Hence, it up to the organisation to adopt a method to estimate your measurement uncertainty.

There few approach in estimating measurement uncertainty, top down approach and bottoms up approach are some of the approach. If you are chemical testing lab, you may refer to eurachem guide to measurement uncertainty. Them link is as below:

https://www.eurachem.org/index.php/publications/guides/quam

 

Thank you.

Shalini Tyagi
par Shalini Tyagi , Senior Manager , WALMART India Private Ltd

As there is no written guideline in ISO 17025 :2005 on calculation of MOU , however eurachem guideline can be followed for calculation of MOU .

During calculation of MOU to critical factors are random error and systematic errors  . 

SESHAGIRI KALYANASUNDARAM
par SESHAGIRI KALYANASUNDARAM , Sr product development resource , Equate Petrochemical

During calculation of MOU to critical factors are random error and systematic errors.

Moreover, the effect of environment also to be considered for MOU calculation. 

Utilisateur supprimé
par Utilisateur supprimé

Standard deviation is calculated using data for a peroid of time ( 6 months to one year ) and is multiplied by 2 to give expanded uncertainity of measurement ; this gives 95% confidence limit.

hammadi selmi
par hammadi selmi , Process Engineering and Metrology Manager , CNCC

To calculate the uncertainty in accordance with ISO 17025 it there's the least square method or Monte Carlo. you can also see the GUM and FD X 07-020, FD X 07-028 ....

To calculate the uncertainty we must also know estimate the random and systematic errors for each physical phenomenon by applying 5M.

More Questions Like This