CAT-II Course Overview

The Category-II course spans four days with an additional half day for review and the exam. It is intended for people who have mastered the basics but who need to be able to take good data (and decide how the data collector should be set up), analyze a range of fault conditions, and understand balancing and alignment.

We teach you to test machines correctly, how to diagnose faults accurately, perform additional diagnostic tests for verification, how to set vibration alarm limits, and how to correct certain types of faults. You will learn what your analyzer settings mean so that you can take the best measurements. And you will learn why the vibration signatures change the way they do and how to use time waveform  analysis and phase analysis to verify the fault condition.

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.


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

  • How a well-designed program and a reliability centered maintenance approach improve the OEE and therefore the bottom line
  • The condition monitoring technologies: acoustic emission, infrared analysis (thermography), oil analysis, wear particle analysis, & motor testing via supplementary training
  • How machines work; via supplementary self-study using the “Equipment Knowledge” section
  • How to select the correct measurement location and axis, and collect good, repeatable measurements
  • What the Fmax, resolution, averaging and other analyzer settings mean, and how to select the optimum settings for a wide variety of machine types
  • How to analyze vibration spectra, time waveforms, envelope (demodulation), and phase measurements
  • How to diagnose: unbalance, eccentricity, misalignment, bent shaft, cocked bearing, looseness, rolling element bearings faults, journal bearing faults, gearbox faults, resonance, and other conditions
  • How to set alarm limits manually and with statistics
  • How to balance and align a machine, and correct a resonance condition

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


CAT-II Course Description

Duration: 4 days Cat II / Level II

Optional: ½ day Review & certification examination, 3 hours, 70% passing grade

Compliance: ISO 18436 Category II –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 18 months of experience is required for certification.

Outcome: You will come away from this course with a very good understanding of vibration analysis fundamentals, and you will be competent in quality data acquisition and diagnosing common machine faults.


Topics covered:

  • Review of maintenance practices
  • Review of condition monitoring technologies
  • Principles of vibration; Review of basics, waveform, spectrum (FFT), phase and orbits
  • Understanding signals: modulation, beating, sum/difference
  • Data acquisition
  • Signal processing
  • Vibration spectrum analysis
  • An introduction to time waveform analysis
  • An introduction to orbit analysis
  • Phase analysis: bubble diagrams and ODS
  • Enveloping (demodulation), shock pulse, spike energy, PeakVue™
  • Fault analysis
  • Equipment testing and diagnostics including impact testing (bump tests) and phase analysis
  • Corrective action
  • Running a successful condition monitoring program
  • Acceptance testing
  • Review of ISO standards


CAT-II 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