A standard calibration will test load cell repeatability and linearity, which are both used to determine the accuracy. A ‘5 Step’ method is most commonly used, where a known load is applied to the load cell incrementally, and output readings are taken at each step. For example, a 100 tonne load cell would have readings taken when subjected to loads of 20, 40, 60, 80 and 100 tonnes. This process is repeated twice, and the difference in the results used to determine its repeatability/accuracy. As most load cells are used with some form of read-out/display to form a weighing system, the load cell and instrumentation should always be calibrated together whenever possible.