T/HBJLXH 004-2022 Active

Main technical content: 1. Preparation before calibration The human scale to be calibrated should have indications such as model specification, manufacturer's name, equipment number, accuracy grade, maximum weighing capacity, minimum weighing capacity, and graduation value. All components should be firmly installed to ensure normal operation. The human scale should be placed on a flat and solid surface. Before calibration, the scale should be preloaded once to its maximum weighing capacity. Adjust the pointer to the zero position, and apply a load of no less than 20% of the maximum weighing capacity to the weighing platform three times. After each unloading, the pointer should return to the zero position. If it fails to return to zero, the zero adjustment should be repeated. After each zero adjustment, the load should be reapplied three times. 2. Calibration of display error The weighing calibration points are generally selected from at least three weighing points within the measurement range, including the minimum weighing capacity, 50% of the maximum weighing capacity, and the maximum weighing capacity. The number of calibration points can be increased according to customer requirements. Before calibration, the pointer should be adjusted to the zero position. At each weighing calibration point, n (n≥3) weighing operations should be performed, and the display values of each weighing should be recorded. The arithmetic average of these values shall be taken as the calibration result. 3. Calibration of repeatability Using a load of 1/2 Max on the weighing platform, three weighing operations should be performed before each weighing. The repeatability calibration can be conducted during the display error calibration. 4. Calibration of partial loading A load equivalent to 1/3 Max should be applied to the weighing platform. It is preferable to use a single weight with a large mass value rather than a combination of weights with small mass values. If a sing