Direct Current (DC) must be used and the spiral shall be oriented in a such di rection that the demagne tization field shall be opposi te to the direction of the residual magnetism of the component. (Ref. ITN 07081 Residual Magne tism Check).The distance be tween the spiral and the object shall be modi fied according to the peak value of residual magnetism measured prior to start the operation.For Rotors components, it is recommended to start demagnetization operation on shafts after they are entir ely assembled to the impellers and spacers; proceed on the lonely shaft after the end of machining phases could be usef ul due to the assembly with no-demagnetized impell ers; it is strong recommended to assembly parts/components already paired with the requi rements of ITN07081 (Residual magnetism Check).