簡要描述：儀(yi)器采用(yong)(yong)(yong)介(jie)(jie)電(dian)(dian)常數法(fa)原理測定(ding)汽(qi)車(che)用(yong)(yong)(yong)汽(qi)油(you)辛(xin)(xin)烷(wan)值(zhi)(zhi)，即運(yun)行(xing)理數統(tong)計(ji)方法(fa)對大量試驗(yan)數據盡心(xin)出力得(de)到汽(qi)車(che)用(yong)(yong)(yong)汽(qi)油(you)介(jie)(jie)電(dian)(dian)常數與其辛(xin)(xin)烷(wan)值(zhi)(zhi)的相關關系，從而通過測定(ding)汽(qi)車(che)用(yong)(yong)(yong)汽(qi)油(you)的介(jie)(jie)電(dian)(dian)常數，確定(ding)其辛(xin)(xin)烷(wan)值(zhi)(zhi)。儀(yi)器設有掃描(miao)測定(ding)檔位和(he)分(fen)段測定(ding)檔位(依據國家(jia)標準(zhun)中的車(che)用(yong)(yong)(yong)汽(qi)油(you)牌(pai)號劃分(fen))，經(jing)標定(ding)和(he)校準(zhun)后(hou)，可直(zhi)接測法(fa)定(ding)汽(qi)車(che)用(yong)(yong)(yong)汽(qi)油(you)辛(xin)(xin)烷(wan)值(zhi)(zhi)，用(yong)(yong)(yong)研究法(fa)辛(xin)(xin)烷(wan)值(zhi)(zhi)(RON)表示。