You should find out the technical characteristics of the weighing instrument (max weight, d value), the accuracy requirement (max error allowed and uncertainty) and what to do if the calibration fails (adjustment). In this article, I look at the practical considerations and the different tests you should perform when calibrating your weighing scales/instruments. The surrounding environment also plays a role. He started working for Beamex in 1988 and has, during his years at Beamex, worked in production, the service department, the calibration laboratory, as quality manager, as product manager and as product marketing manager. Using a calibration company that is accredited to the ISO 17025 standard provides this assurance of calibration traceability as well as proficiency in performing the calibrations. A beam balance (or beam scale) is a device to measure weight or mass.These are also known as mass scales, weight scales, mass balances, weight balances, or simply scales, balances, or balance scales.. Ensure reliable calibration of legal-for-trade scales— these test weight sets come with a certificate of calibration traceable to ASTM that states they’ve passed a test for accuracy. Rather, in addition to the manufacturer’s specified tolerance, you should consider: Let’s say, for example, your process requires ±5 grams, test equipment is capable of ±0.25 grams, and the manufacturer states accuracy for your scale is ±0.25 grams. If necessary, the instrument can be zeroed in between each test. For the minimum weight test, the two main standards have different approach. While some industrial weighing instruments are very large ones that measure, for example, mass of trucks. Our operations, based out of our headquarters in Quakertown, Pennsylvania, are ISO/IEC 17025 accredited and can accommodate large jobs or jobs that require fast turnaround times. The 2 certified weights should be weighed separately on the scale and then on a verified electronic scale (the type used for net weight verifications). The load does not necessarily need to be a calibrated load, as the aim is to find out the repeatability. CMX supports various tests such as: Eccentricity Test, Repeatability Test, Weighing Tests and Minimum Weighing Test. This means that when the same load is measured several times, the result is not always exactly the same. Even instrument’s zero and full range are adjusted correctly, there is error in the midrange due to unlinearity of the instrument: Hysteresis is the difference in the indication when a test point is approached with increasing or decreasing weight. Next, the load is placed in four different sectors of the load receptor, as illustrated in the picture below. Some are calibrated once per month, others are only calibrated once per year, while some are even spot checked daily for accuracy. The first decision to make is whether to choose a mechanical or digital scale. Note that non-automatic weighing instruments are usually referred to as either balances or scales. There are dedicated regulations for weighing instruments and their calibration (EURAMET Calibration Guide, NIST Handbook 44, OIML); more on those later in the article.In this article, the main focus is to look at the practical considerations and the different tests you should perform when calibrating your weighing instruments. Once you realize that scale calibration is essential to the success of your business, you’re sure to have some questions: This guide was designed to give you some insight to scale calibration so you can create a plan of action and ensure that you don’t have any problems associated with having an inaccurate scale. specified calibration weight that can be found in its manual or in the manufacturer’s table of standard calibration weights. The above picture is for rectangular and round load receptors, but naturally in practice there are many different shapes of load receptors and the location of the load will vary. Update February 2019: We made an educational video on weighing scale calibration, you can find that in this link: Weighing scales, weighing instruments, weighing balances… different resources are using different terminology. This document is usually in the form of a metal plate or tag on the scale with the make, model and capacity information. 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