A.L B.E C.G D.V
A.250V B.500V或1000V C.5000V D.10000V
A.可直接轉動量程開關 B.先將鉗口打開,再轉動量程開關 C.將鉗形電流表從導線上取下來,再轉動量程開關 D.先關閉被測電流,再轉動量程開關