How to Verify the Performance of Your Weighing Machine
Product testing is the best way to verify the performance of your weighing machine. When performing product testing, the product should be weighed on a static scale with a resolution that is at least 5 times the resolution of the weighing machine, which needs to be recently calibrated and checked. During the test, it is only necessary to simply take out a representative product from the production line, let the same product pass the checkweighing department at a high production speed, and then weigh it on a static weigherand record the weighing result. The same product should be run multiple times on the checkweigher unit to establish a normal distribution curve, which will provide a basis for the performance of the weighing machine as well as the standard deviation σ. For routine testing during the operation of the weighing machine, the results of 30 runs are usually used, while for conformity assessment, the results of 100 runs are usually used. The average is the sum of all measurements divided by the average of the number of measurements. The standard deviation is the spread of the measurements around the center point from the lowest to the highest weight value. The standard deviation is calculated based on all weight measurements to determine the margin of error. By calculating the average and standard deviation of the test data, the accuracy of the checkweigher machine can be expressed by ±1σ, ±2σ or ±3σ. However, only the definition of ±2σ or ±3σ is actually used, and more manufacturers adopt the definition of ±3σ, because this definition is stricter and accepted by many users. The accuracy test can also use product samples on the production line. Test according to the actual operating conditions, such as passing 100 products in sequence, and record the weighing display value of these products on the checkweigher machine. The theoretical weight values u200bu200bof these products can either be weighed on a static scale first and then passed through a weighing machine, or can be weighed on a static scale after passing through a weighing machine. Then compare the difference between the theoretical weight value and the weighing display value. If the difference is less than 2g for 95 times and less than 3g for 99 times, then the accuracy according to the definition of ±2σ or ±3σ should be ±2g (±2σ) or ±2g respectively. 3g (± 3a).
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