Calibration is to calibrate the basic standard of equipment with standard solution, and then carry out inspection. The calibration is not accurate, and the test results and quality control will not be accurate.
Quality control is carried out under the same conditions as the specimen. If the quality control exceeds the specified standard deviation, the test results of this batch may be out of control, that is, inaccurate, so it is necessary to find out the reasons for the out-of-control and re-operate. For reference.