Calibration World Issue 1-2007 - Beamex - #11

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instruments should happen by estimating the quality of the measuring device in the place where it will be used. In practice, this means investigating the efficiency of the weighing instrument; this operation is known as calibration (or verification). One calibration provides information on a temporary basis and a series of calibrations provides time-dependent information. The method of calibration should be selected such that it provides sufficient information

for evaluating the required measuring tolerance. The method should be precise for achieving comparable results during all calibrations.

C omparing the indication of weighing instruments with a set standard gives the deviation or error. However, to be able to define the measuring tolerance, we need more information about the weighing instrument, such as repeatability, eccentric load, hysteresis, etc. We must remember that the quality

of the evaluation of measuring tolerance depends on the collected information through calibration.

Using a calibration program, which goes through the same steps for every calibration - calculates deviation and measuring tolerance, and, if necessary, produces a calibration certificate - is the best way to achieve reliable

www.beamex.com/calibrationworld CALIBRATION WORLD 01- 2007