CAT-III Course Overview

The Category-III course covers four days, with an additional day for review and the exam, is intended for people who are confident with spectrum analysis but who wish to push on and learn more about signal processing, time waveform and phase analysis,cross-channel testing, machine dynamics, and fault correction. If you wish to truly advance in vibration analysis and be able to run a successful condition monitoring team, then you are ready for this course. The course exceeds the ISO 18436 -2 Category III standard and meets the ASNT Level III Recommended Practice.
You will learn to diagnose all of the common faults conditions with rolling element and sleeve bearing machines, by utilizing time waveforms, phase readings and other techniques to diagnose faults. You will also learn machine dynamics (natural frequencies, resonance, etc.) and how to perform resonance testing and correct resonance problems. The course also covers single and cross-channel measurement capabilities of your analyzer. And after completing the CAT-III course, you will be able to set and run a successful vibration program, and mentor the junior analysts.


Mobius makes learning about vibration analysis unique. We use 3D animations, Flash simulations, and numerous software simulators that completely demystify vibration analysis. While vibration training courses have traditionally been very theoretical, difficult to understand (and boring), you will be captivated by the Mobius training methods, and you will enjoy our practical approach. You will take away skills that you can immediately apply to your job, and you will truly understand what you are doing. When senior vibration analysts attend our classes they often say “if only I could have learned this way when I got started”. You have the opportunity to do just that.


You will come away from the course with a solid understanding of:

  • How a well-designed program and the RCM approach will improve the OEE and the bottom line
  • The condition monitoring technologies – via supplementary training
  • How to select the correct measurement location and axis, and collect good, repeatable measurements
  • What the Fmax, resolution, averaging and other single-channel and cross-channel analyzer settings mean, and how to select the optimum settings
  • How to analyze vibration spectra, time waveform, envelope, and phase measurements
  • How to diagnose a wide range of fault conditions
  • How mass, stiffness and damping affects the natural frequency of a structure
  • How to use phase readings, bump tests, impact tests, negative averaging, peak-hold averaging, transient, ODS, modal analysis to determine natural frequencies and visualize machine movement
  • How to balance and align a machine, correct a resonance conditions, and employ isolation

Our public courses are conducted by an experienced, certified Mobius Institute instructor


CAT-III Course Description

Duration: 4 days Cat III / Level III

Optional: 1 day Review & certification examination, 4 hours, 70% passing grade

Compliance: ISO 18436 Category III –Vibration Analyst, ASNT SNT-TC-1A Recommended Practice

Course Pre-Study: Registered students are given access to the online version of the course via the Mobius Institute Learning Zone before the class and for six months after course completion to assist them with converting the course information into practice

Online Learning: Registered students are given access to the Mobius Institute Learning Management System for a period of 6 months to provide ample time to learn the material and prepare for the optional certification examination

Certification Prerequisite: Prior experience is not required for attending the training course, but 36 months of experience is required for certification.

Outcome: You will leave this course with a complete understanding of vibration and phase analysis, dynamic balancing and shaft alignment, and a developing knowledge of machine dynamics and all condition monitoring technologies


Topics covered:

  • Review of condition monitoring technologies and the ISO standards
  • Signal processing and data acquisition
  • Time waveform analysis
  • Phase analysis
  • Dynamics (natural frequencies and resonance)
  • Testing for natural frequencies
  • Operating Deflection Shape (ODS) analysis
  • Modal analysis and intro to FEA
  • Correcting resonances
  • Rolling element bearing fault detection
  • Journal bearing fault detection
  • Electric motor testing
  • Pumps, fans and compressors
  • Gearbox fault detection
  • Corrective action
  • Running a successful condition monitoring program
  • Acceptance testing
  • Review of ISO standards


CAT-III Certification

All Mobius certified analysts receive personalized logos with their certification number and name for their own professional use. Mobius Institute also maintains a listing of all certified analysts on our website and provides each analyst with a certification confirmation webpage. For more information about Mobius Institute’s accreditation, and the recognition of your certification by the ISO 18436 standard, please visit