| 摘要 |
PURPOSE:To measure long-time variation in welded value without any error by providing an electronic weighing device, a sample adding and removing mechanism, a calibration weight adding and removing mechanism, a control part, etc., and automatically updating a calibration coefficient at intervals of the specific number of times of weighing. CONSTITUTION:This instrument is provided with the electronic weighting device 1 which calculates the calibration coefficient (k) from the output of a load detection part 1 when a calibration weight C is placed as a load and the weighed value of a body S to be measured from the output of the detection part 11 when the body S to be weighed is placed as a load and the calibration coefficient (k), the sample adding and removing mechanism 2 which mounts and demounts the body S to be weighed on and from the detection part 11, and the calibration weight adding and removing mechanism 3 which mounts and demounts the weight (c) on and from the detection part 11. Then, a control part 4 is provided which controls the weighing device 1 and mechanisms 2 and 3 according to a set sequence, the body S to be measured is mounted and demounted automatically to weigh it plural times, and the weight is placed as the load automatically at intervals of the specific number of times to update the calibration coefficient (k). Consequently, the weighed value contains no error and this equipment is used to a test such as the investigation of variation in water content, etc., for a long time while ambient temperature is varied, thereby obtaining a high-accuracy measurement result.
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