Question posted on behalf of Dr K.V.Rao <[EMAIL PROTECTED]> >Recently we procured one x-ray powder diffractometer from a reputed vendor. During installation we asked them to show us the accuracy and reproducibility of the system. Initially they said that the quartz standard they have supplied with the instrument is not a very good crystalline sample. So we have to procure a certified standard sample from some place then they can demonstrate the accuracy and reproducibility on that sample. When we told them that it is their responsibility to provide the proper standard and demonstrate the specifications asked by us and quoted by them, they started telling that it is not possible to check the accuracy and reproducibility at the site with the existing software available on the system. These can be checked only at the manufacturing factory where they have to use special measuring tools and software. So now we are unable to accept the system just based on their brochure/manual specifications. > >Please let me know the following. >1. What is the normal procedure followed to check the accuracy and reproducibility of the powder diffractometer? >2. Is it true that the accuracy and reproducibility can not be checked at site and they can only be measured at the manufacturing factory? >3. Is it true that they need special tools and separate software apart from whatever they have supplied with the instrument for this purpose? > >Please send your comments / suggestions to the following address > >Attn: Dr. K.V.Rao >e-mail: [EMAIL PROTECTED] > >or [EMAIL PROTECTED] > >Thanking you in advance Alan Hewat, ILL Grenoble, FRANCE <[EMAIL PROTECTED]> tel (33) 4.76.20.72.13 ftp://ftp.ill.fr/pub/dif fax (33) 4.76.20.76.48 http://www.ill.fr/dif/
