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Vol. 132, Issue 9, September 2011, pp.76-88




Use of Balance Calibration Certificate to Calculate the Errors of Indication and Measurement Uncertainty in Mass Determinations Performed in Medical Laboratories


Adriana VĀLCU

National Institute of Metrology, Mass Laboratory

Şos. Vitan Bārzeşti nr.11, sect.4, 042122 Bucharest, Romania

Tel.: +40213345520

E-mail: adriana.valcu@inm.ro, adivaro@yahoo.com



Received: 8 August 2011   /Accepted: 19 September 2011   /Published: 27 September 2011

Handbook of Laboaratory Measurements book


Abstract: Based on the reference document, the article proposes the way to calculate the errors of indication and associated measurement uncertainties, by resorting to the general information provided by the calibration certificate of a balance (non-automatic weighing instruments, shortly NAWI) used in medical field.


The paper may be also considered a useful guideline for: operators working in laboratories accredited in medical (or other various fields) where the weighing operations are part of their testing activities; test houses, laboratories, or manufacturers using calibrated non-automatic weighing instruments for measurements relevant for the quality of production subject to QM requirements (e.g. ISO 9000 series, ISO 10012, ISO/IEC 17025); bodies accrediting laboratories; accredited laboratories for the calibration of NAWI.


Article refers only to electronic weighing instruments having maximum capacity up to 30 kg. Starting from the results provided by a calibration certificate it is presented an example of calculation.


Keywords: Calibration of weighing instrument, Error of indication, Regression


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