Ngokuphathelene nokudluliswa kwesignali yokudlulisa ezinhlotsheni zokusebenza ezenzakalelayo zezimboni, i-4~20mA ingenye yezinketho ezivame kakhulu. Uma kwenzeka kuzoba nobudlelwano obuqondile phakathi kokuguquguquka kwenqubo (ingcindezi, izinga, izinga lokushisa, njll.) kanye nomphumela wamanje. I-4mA imele umkhawulo ophansi, i-20m...
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