Introduction to each grade of stainless steel weights

Stainless steel weights refer to the objects on the balance as the quality standard, usually metal blocks or metal pieces, which can be used for more accurate weighing, and are placed on one end of the balance as the weight standard metal blocks or metal pieces. They have different sizes. Each has a certain weight, a physical measuring tool with a given quality and a prescribed shape, which is used for the verification of the weighing instrument and the weighing on the weighing instrument. Stainless steel weights must be combined with balances or scales (the stainless steel weights used on the scales are often called mounds) before they can be used to measure the mass of other objects, so it is a subordinate physical measuring tool. The weight grades are: El grade weight (original work standard grade weight): traced back to the national standard and sub-standard, used to verify the transfer of E2 grade weights, E2 weight: used to verify the transfer of F1 grade and below Weights, F1 grade weights: used to verify the transfer of F2 grade and below weights, F2 grade weights: used to verify the transfer of M1 grade, M12 grade and below weights, M1 grade weights: used for verification transfer Weights of M2, M23 and below; M2 weights: used to verify and pass M3 weights and M3 weights: used to verify the corresponding measuring instruments. When testing equipment, high-grade weights can replace low-grade weights. Of course, the weights should be selected according to the actual situation, otherwise the testing purpose will not be achieved. For the weights used for balance testing, it is best to use one level higher, which can achieve high-level inspection and low-level amplification. Most electronic scales are smart in the calibration procedure. Linear calibration (divided into several points for calibration) can be used to minimize the linear error. At the FI regular work site. If the actual display error of the electronic scale is within the allowable error, it is very unrealistic. Therefore, the appliance should be calibrated in time intervals. It is best to calibrate with a full-weighed weight. The calibration value can also be selected according to the actual weighing size. In principle, the calibration weight of the balance should be higher than the accuracy grade of the balance. One hundred thousandth, the smallest scale is 0. Olmg, belongs to the first-class balance (special accuracy level), calibrated with El weights. One in ten thousand, the smallest scale is 0.1mg, which belongs to the first-class balance and is calibrated with E1 or E2 weights. One-thousandth, the smallest scale is 1mg, which belongs to the second-class balance and is calibrated with E2 or Fl weights. One hundredth, the smallest scale is 0. Olg, belongs to the third class balance, F1 weight calibration. In actual use, it is best to use high-grade weights to calibrate. Of course, the weights used must be measured and verified before they can be accurate. The principle of selection of standard weights is that if the used standard weights have a correction value, the sum of the expanded uncertainty of the converted mass should not exceed I/3 of the mass expanded uncertainty of the tested weight. If there is no correction value, the total mass tolerance of the standard weight should not exceed 1/3 of the extended uncertainty of the mass of the tested weight.