DEVICE FOR ELECTROMAGNETIC TESTING OF MOVING FERROMAGNETIC ARTICLES

摘要

The invention relates to the field of nondestructive testing of materials and products, in particular to the field of controlling the hardness of the moving ferromagnetic products, object of the invention is a controlled expansion of the range of products. This aim is achieved by allowing the automatic shift control sensitivity ferromagnetic articles moving device. When moving ferromagnetic article 17, in the converter 2, EMF E2 (t) of the useful signal increases, and at time ta voltage Uz at the output of the amplifier 3 reaches the threshold Un direct actuation additional comparator 13. The comparator is triggered and opens the third switch 11, the fourth key 12, through inverter 15 closes the second switch 9 and the first key 4. The input of amplifier voltage Ez (t) output from the inverter 2 starts flowing through the switch 9 is not intact, and a weakened K times via the attenuator 10 and the open key 11. Thus RANGES N monitored values ​​of the useful signal and nomenclature controlled products are increased. 2 yl. ff