... and Manufacturer1,Name Three-phase full-wave ac/dc fluorescent magnetic powder flaw detection machine2,Model CZQ-4000B,Design standard & ... Equipment design and manufacturing standards: the national standard GB3721-83 "magnetic powder flaw detection machine.2,This equipment should meet all ... 2,Dc sensitivity JB/T6066 according to regulations,adopts B shape standard test blocks,set 3400 A dc current,Try ...