Classification: NPL Management Ltd - Commercial Dear Matt, It's a good idea to have a calibration factor rather than adjustment as it allows a calibration history to be built up, that shows long term drift of the meter & sensor. This enables you to get a good estimate of the uncertainty of measurement if you're doing a Guide to Uncertainty in Measurement compliant budget. Regards Simon Simon Hall Senior Research Scientist National Physical Laboratory | Hampton Rd | Teddington | Middlesex | UK | TW11 0LW t: 020 8943 6758 e: [log in to unmask] w: www.npl.co.uk From: British Medical Laser Association [mailto:[log in to unmask]] On Behalf Of sandy mosse Sent: 25 October 2012 18:49 To: [log in to unmask] Subject: Re: Laser Power meter calibration : Ophir These people will certify if the equipment is within calibration but they will not adjust it to improve it if it is out of calibration. Optical Test and Calibration Ltd 21-23 Campus road Listerhills Science Park Bradford BD7 1HR On 25 October 2012 15:31, Williamson Matt <[log in to unmask]> wrote: Dear list We recently acquired the Ophir range of laser power measurement devices. Could anyone let me know if there are independent calibration services out there. We were advised our meters would be away for 5 weeks! We also have had faults reported on our heads, which is surprising as these haven't had heavy use Any comments on /off list Thanks Matt Matt Williamson Head of Physiological Sciences Medical Physics & Engineering Leeds Teaching Hospitals NHS Trust Tel 01924 541640 mob 07768 987956 [log in to unmask] -- Dr Sandy Mosse National Medical Laser Centre Dep't of Surgery, UCL 67-73 Riding House St. London W1W 7EJ +44 (0)20 7679 9073 / 9060 -- If you have received this message in error, please notify us and remove it from your system. NPL Management Ltd cannot guarantee that the e-mail or any attachments are free from viruses. NPL Management Ltd is a company registered in England and Wales, number: 2937881 Registered office: Serco House | 16 Bartley Wood Business Park | Hook, Hampshire | UK | RG27 9UY