A.±1.5% B.±2.5% C.±5% D.±3%
A.2檔 B.靠近兩端各選1檔 C.中間選2檔 D.靠近兩端及中間可選3~4檔
A.0.8~1.1 B.1.1~1.2 C.1.2~1.3 D.0.7~1.2