A standard metal ball with known RCS value has been used as the calibration body in the external calibration experiment which used a relativecalibration method and acquired the calibration data.
实验时采用已知rcs值的标准金属球作为定标体，使用相对定标法对系统进行外定标实验，得到定标数据。
2
Such impurities requiring calibration calculation normally use main component as reference and use relative retention time for orientation, such value are to be recorded under each type.
这些需作校正计算的杂质，通常以主成分为参照采用相对保留时间定位，其数值一并载人各品种项下。
3
We measure that in a more relative sense; this will give us a calibration.