How to Choose an Eddy Current Training Provider

Choosing an eddy current training provider should involve more than comparing course length and price.

Eddy current testing is a highly technical NDT method. A technician may be expected to understand electromagnetic theory, select appropriate test frequencies, recognize relevant indications, distinguish them from nonrelevant variables, operate increasingly sophisticated equipment, and make decisions that can affect the integrity of critical components.

Good training should therefore accomplish more than preparing someone to pass a multiple-choice examination. It should help develop a technician who understands what the instrument is telling them, why it is happening, and when the expected response does not make sense.

Whether you are selecting Eddy Current Level I, Level II, Level III, tubing, surface, aerospace, or application-specific training, here are some questions worth asking before choosing a provider.

1. What Are the Instructor’s Qualifications?

The instructor may be the most important part of any technical training program.

An impressive slide deck cannot compensate for an instructor who has limited experience applying the method.

Look beyond the title of “instructor.” Consider the individual’s actual qualifications and experience:

• What NDT certifications do they hold?
• How long have they worked with eddy current testing?
• Have they actually performed inspections in the field?
• Have they analyzed eddy current data?
• Have they developed techniques and procedures?
• Have they been responsible for resolving difficult technical problems?
• Do they have experience as a Level III?
• How much experience do they have teaching the method?

There is also an important difference between knowing a subject and knowing how to teach it.

The best technical instructors have both.

2. Does the Course Teach Theory AND Application?

There has been a trend in technical training toward emphasizing practical application while minimizing theory.

Practical training is essential. But eliminating too much theory can create technicians who know what buttons to push without understanding why they are pushing them.

Eddy current testing is based on electromagnetic principles. Frequency, conductivity, permeability, inductive reactance, impedance, phase, fill factor, lift-off, standard depth of penetration, and other variables are not academic trivia. They explain what the technician sees on the instrument.

A technician does not necessarily need to be an electrical engineer.

But technicians should understand enough of the underlying physics to answer questions such as:

Why did the signal change?

Why did changing frequency affect the indication?

Why does lift-off move in this direction?

Why did penetration decrease?

Why isn’t this reference standard behaving the way I expected?

Theory becomes particularly important when an inspection does not behave exactly like the example used during training.

Application teaches technicians what normally works.

Theory helps them understand what to do when it doesn’t.

3. Does the Training Match the Work the Technician Will Actually Perform?

“Eddy current testing” covers an enormous range of applications.

Someone performing aircraft bolt-hole inspections may need very different knowledge and skills from someone analyzing nuclear steam-generator tubing.

Training may involve applications such as surface inspection, tubing inspection, heat exchangers, aircraft structures, bolt holes, rotating probes, weld inspection, conductivity measurement, material sorting, array probes, or specialized electromagnetic techniques.

A general course may provide the necessary foundation, but technicians also need training applicable to the equipment, techniques, and components they will actually encounter.

Before purchasing training, ask:

What applications does this course actually prepare the student to perform?

4. Does the Course Meet the Applicable Training Requirements?

Completing an eddy current course does not automatically make someone a certified Level I or Level II.

Certification is normally performed by the employer in accordance with the employer’s written practice and the applicable certification program or standard.

Depending upon the industry and organization, requirements may involve documents such as SNT-TC-1A, ANSI/ASNT CP-189, NAS-410, or other applicable standards and specifications.

A training provider should be able to explain what its course covers and provide appropriate documentation of training.

Be cautious when training and certification are presented as though they are automatically the same thing.

They aren’t.

5. Are Difficult Concepts Actually Explained?

Anyone can put an equation on a PowerPoint slide.

Good instruction explains what the equation means.

For example, a student learning standard depth of penetration should not simply memorize a formula. They should understand that penetration changes with frequency, conductivity, and permeability—and understand the practical implications of those relationships.

The same applies to impedance, phase, inductive reactance, coil loading, fill factor, and signal-to-noise ratio.

Good training uses a combination of explanations, diagrams, examples, calculations, demonstrations, and exercises to approach difficult concepts from several directions.

A useful question to ask is:

Does the course explain the subject, or merely present it?

There is a significant difference.

6. Does the Training Include Meaningful Exercises?

Technical knowledge improves when students have an opportunity to apply it.

Depending upon the course format, this may include laboratory exercises, instrument demonstrations, sample data, calculations, reference-standard exercises, indication evaluation, or realistic inspection scenarios.

For online training, interactive calculators, simulations, and visualizations can also help students experiment with variables and immediately see the effect.

For example, rather than simply telling a student that increasing frequency reduces penetration, let the student change the frequency and observe what happens to calculated standard depth of penetration.

The objective isn’t interaction for the sake of interaction.

The exercise should reinforce a technical concept.

7. Can the Instructor Answer Questions Beyond the Slides?

This may be one of the best tests of instructor knowledge.

Students ask unexpected questions.

Sometimes those questions involve situations that aren’t covered in the course material:

“What happens if the material is ferromagnetic?”

“Why does my instrument display the signal differently?”

“What happens if I change both frequency and gain?”

“Why did this technique work on one component but not another?”

An experienced instructor should be able to discuss those questions intelligently—and should also be comfortable saying “I don’t know” when appropriate.

Technical credibility doesn’t require knowing everything.

It requires knowing the difference between what you know, what you believe, and what needs to be verified.

8. How Current Is the Training?

The fundamental physics of eddy current testing hasn’t suddenly changed.

The equipment and applications have.

Modern eddy current instruments may incorporate digital signal processing, arrays, C-scans, encoded data, multi-frequency testing, sophisticated filtering, and software tools that did not exist when many traditional training materials were developed.

Older reference material can still be extremely valuable. In fact, some of the best explanations of eddy current fundamentals can be found in older technical publications.

The question isn’t whether the training material is old or new.

The question is whether it remains technically correct and relevant to modern inspection practice.

9. What Happens When the Student Gets Something Wrong?

Good technical training should provide meaningful feedback.

Simply telling a student that an answer is incorrect has limited educational value.

Whenever practical, the student should understand why the answer was incorrect.

That distinction becomes increasingly important as the subject becomes more complex. Misunderstanding the relationship between frequency and penetration, for example, is more important than merely missing one question on a quiz.

The objective should be to correct the misunderstanding—not merely record the score.

10. Is the Provider Teaching—or Selling Shortcuts?

Be cautious of training that promises to make a complicated subject effortless.

Good instruction can make difficult concepts easier to understand.

That is not the same as pretending the concepts aren’t difficult.

Eddy current testing requires study, practice, and experience. There are no shortcuts that replace those things.

A course should certainly help a student prepare for examinations. But passing an examination should be a consequence of understanding the material—not the sole purpose of the training.

Questions to Ask Before Purchasing Eddy Current Training

Before selecting a training provider, consider asking:

Who will actually teach the course?

What are the instructor’s eddy current qualifications and field experience?

Which applications are covered?

What certification program or training requirements does the course address?

Does the course cover both theory and practical application?

Are exercises or laboratories included?

How are examinations administered and documented?

Can students ask technical questions during or after the course?

How often is the course material reviewed and updated?

What documentation will the student receive upon completion?

A reputable training provider should be comfortable answering those questions.

About EddyCurrent.com Training

The criteria discussed above are also principles we use when developing training at EddyCurrent.com.

Our online courses at courses.eddycurrent.com are designed around both the fundamental theory of eddy current testing and its practical application. Course material emphasizes understanding why eddy current responses occur—not simply memorizing answers or learning which buttons to push.

Training includes subjects ranging from Eddy Current Level I and Level II to tubing analysis, Level III material, and supporting subjects such as the math and physics used in eddy current testing.

Interactive tools, calculations, visualizations, quizzes, and practical examples are incorporated where they help reinforce the underlying concepts.

Our objective is straightforward:

Teach the theory. Demonstrate the application. Develop better eddy current technicians.

For current course offerings and course descriptions, visit courses.eddycurrent.com.

There Is No Single “Best” Eddy Current Training Provider

Different students and organizations have different needs.

A company training technicians for aircraft surface inspections may need something very different from a utility training analysts for heat-exchanger tubing. An experienced Level II preparing for Level III examinations has different needs from someone seeing an impedance plane for the first time.

So instead of asking:

“Who has the best eddy current course?”

A better question may be:

“Who provides the best training for what I need to be able to do?”

Look at the instructor. Look at the technical content. Look at the applicable requirements. Look at the exercises. Look at the instructor’s practical experience. And most importantly, determine whether the training develops understanding rather than memorization.

The goal of eddy current training shouldn’t simply be to produce someone who can pass an exam.

It should produce a better eddy current technician.