Duration: 10 days
What will I learn?
This curriculum meets or exceeds the examination
syllabus for the certification of Level 2 personnel in Eddy
Current Testing of Aerospace Materials and
Components, in accordance with EN 4179.
The course ends with the certification examination.
Objectives
Day 1 (Hours 1 to 4) THEORY, CHAPTER 1: Basic
Principles of Eddy Currents
Applications, Advantages, Limitations, Eddy currents,
alternating current in a coil, Magnetic coupling,
Production of eddy currents, Lenz’s Law, eddy
current inspection, Calibration of high frequency meter
instruments, Inspection using high frequency meter
instruments, Calibration of high frequency phase
display instruments, Inspection using high frequency
phase display instruments
CHAPTER 2: Factors affecting Eddy Currents
Conductivity, Permeability, Ferrous, non-ferrous,
paramagnetic and diamagnetic materials, Frequency,
Geometry, Proximity, Discontinuities, Probe handling,
Depth of penetration
APPENDIX B: Reference Literature: Standards and
Specifications
APPENDIX E: Glossary of Terms
HOMEWORK Chapters 1 & 2 issued
Day 2 (Hours 9 to 12) THEORY,
Review of Homework Chapters 1 & 2
CHAPTER 3: Electrical Theory
Direct current (DC), Direct current theory, Alternating
current (AC) theory
Day 2 (Hours 13 to 16) PRACTICAL,
Hours 13 to 16 Student Practice Impedance, Bridge
Instrument Conductivity Meter
Practical Exercises (QRS 29) HOMEWORK Chapter 3
issued
Day 3 (Hours 17 to 20) THEORY
Review of Homework Chapter 3
CHAPTER 4: Phase Analysis
Current/Voltage phase relationship, Conductivity
changes, Dimensional changes Change in frequency,
Change in permeability, Changes in probes, Choice of
operating point and f/fg, Characteristic frequency
Day 3 (Hours 21 to 24) PRACTICAL,
Hour 21 Instructor Demo, Impedance Plane Instrument
High Frequency Application Hours 22 to 24 Student
Practice, Impedance Plane Instrument High Frequency
Application Practical Exercises
HOMEWORK Chapter 4 issued
Day 4 (Hours 25 to 28) THEORY,
Review of Homework Chapter 4
Review of Chapter 4: Phase Analysis
CHAPTER 5: Practical Impedance Plane Analysis
Reviewing impedance plane fundamentals
Presentation of conductivity, Lift-Off (coating thickness
measurement) Selection of frequency, Corrosion and
cracks in subsurface layers Location of 2nd layer
corrosion or cracking Change of probe, Change of
permeability
Day 4 (Hours 29 to 32) PRACTICAL,
Hour 29 Instructor Demo Impedance Plane Instrument
Conductivity Measurement
Hours 30 to 32 Student Practice Impedance Plane
Instrument High Frequency Application
Conductivity Measurement Practical Exercises
HOMEWORK Chapters 5 issued
Day 5 (Hours 33 to 36) THEORY,
Review of Homework Chapter 5
CHAPTER 6: Coils and Probes
Surface coils, High frequency surface probes Low
frequency surface probes, encircling coils, Internal coils,
Fill factor, Coil magnetic fields Ferrite core probes Air
core probes Shielded
coil probes Saturation probes, Factors effecting eddy
current probe performance
CHAPTER 7: Coil Arrangement
Single absolute coil, Double absolute coil, Single
differential coil, Double differential coil, Selfcomparative system, External comparative system
Day 5 (Hours 37 to 40) PRACTICAL,
Hour 37 Instructor Demo, Impedance Plane Instrument
Differential Coils High Frequency
Application
Hours 38 to 40 Student Practice, Impedance Plane
Instrument High Frequency Application
Differential Coils
Practical Exercises
HOMEWORK Chapters 6 & 7 issued
Day 6 (Hours 41 to 44) THEORY,
Review of Homework Chapters 6 & 7
Review of Days 1 to 5
CHAPTER 8: Practical Eddy Currents
High frequency crack detectors (surface faults), Hole
inspection, Low frequency tests sets
(variable frequency), Corrosion detection-subsurface,
Crack detection-subsurface
Day 6 (Hours 45 to 48) PRACTICAL,
Hour 45 to 46 Instructor Demo, Impedance Plane
Instrument Low Frequency Application
Corrosion Detection-subsurface Crack Detectionsubsurface
Hours 47 to 48 Student Practice, Impedance Plane
Instrument Low Frequency Application
Corrosion Detection-subsurface Crack Detectionsubsurface Practical Exercises
HOMEWORK Chapter 8 issued.
Day 7 (Hours 49 to 52) THEORY,
Review of Homework Chapter 8
APPENDIX A: Writing of Reports and Instructions
Day 7 (Hours 53 to 56) PRACTICAL,
Hours 53 to 56 Student Practice Writing of a report and
an instruction Practical Exercises
Day 8 (Hours 57 to 60) THEORY,
Review of Reports and Instructions
CHAPTER 9: Use of Filters
Modulation, Eddy current instrument filter usage,
Filters, Selection of frequency
CHAPTER 10: Bolt and Fastener Hole Inspection using
Rotating ‘Spinning’ Probe
Equipment, Advantages, Probes, displays – time-base
and spot, Interpretation, Effect of frequency,
Calibration blocks, Calibration, Inspection, Spinning
probes
Day 8 (Hours 61 to 64) PRACTICAL,
Hour 61 to 62 Instructor Demo, Impedance Plane
Instrument Use of Filters Bolt and
Fastener Hole Inspection
Hours 63 to 64 Student Practice, Impedance Plane
Instrument Use of Filters Bolt and
Fastener Hole Inspection
Practical Exercises
HOMEWORK Chapters 9 & 10 issuedDay 9 (Hours 65 to 68) THEORY,
Review of Homework Chapters 9 & 10
CHAPTER 11: Dual Frequency Inspection
Overview of dual frequency inspection Reference
standard, Principle of dual frequency calibration, Choice
of Frequency 1 and Frequency 2, Practical calibration
CHAPTER 12: Basic Test Set Design
Bridge circuits, Bridge circuits with resonant probes
pure impedance measuring circuits Phase comparison
circuits, warning devices, Impedance plane analysis
display instruments, Cathode Ray Tube.
Day 9 (Hours 69 to 72) PRACTICAL,
Hour 69 Instructor Demo, Impedance Plane Instrument
Dual Frequency Calibration Dual
Frequency Inspection
Hours 70 to 72 Student Practice, Impedance Plane
Instrument Dual Frequency Calibration
Dual Frequency Inspection Practical Exercises
HOMEWORK Chapters 11 & 12 issued
Day 10 (Hours 73 to 80) THEORY,
Review of Homework Chapters 11 & 12
Review of Days 6 to 9
APPENDIX C: Comparison of Methods
Course Review Theory Review Practical Review
End of Course Examination
Day 10 (Hours 73 to 80) PRACTICAL,
Hours 73 to 80 Student Practice, Impedance Plane
Instrument Completion of Exercises as required
Practical Exercises