This standard specifies the technical requirements, test methods, inspection rules and markings, packaging, transportation and storage of electromagnetic yoke flaw detectors. This standard applies to AC and DC electromagnetic yoke type magnetic particle flaw detectors with a magnetic pole spacing of 75 to 225mm.
JB/T 7411-1994 history
2012JB/T 7411-2012 Non-destructive testing instruments.Specification of electricity magnetic yoke magnetic particle flaw detector