... human-machine interface control system 11,Automatic demagnetization systemAttenuation type automatic demagnetization.12,Equipment has to be automatic alarm ... current AC, 0 --- 4000A, RMS three-phase full-wave ac,Timely setDC, 0 --- 4000A, RMS three-phase full-wave dc,Timely set4,Longitudinal ... .2,Dc sensitivity JB/T6066 according to regulations,adopts B shape standard test blocks,set 3400 A dc current ...