- What the Eight Domains Actually Represent
- Where the Sources Disagree
- Domains 1-3: Sources, Machinery Basics and Data
- Domains 4-6: Machines, Instruments and Testing
- Domains 7-8: Basic Analysis and Severity
- Exam Format and What the Handbook Says
- Eligibility and Registration Mechanics
- Sequencing the Domains in a Study Plan
- Five-Year Cycle and Renewal
- Frequently Asked Questions
- The eight domains mirror the Introduction to Machinery Vibration course headings; they are not official exam weightings.
- The Vibration Institute calls the IMV course partial preparation and references ISO 18436-2:2014.
- The retrieved 2022 handbook describes 63 questions in two hours, but a newer handbook could not be verified.
- Eligibility needs 30 hours of qualifying training plus six months of relevant vibration experience.
What the Eight Domains Actually Represent
If you are preparing for the Vibration Institute's Certified Vibration Analyst Category I credential, the eight "domains" in this guide need careful framing. They are the exact "Course Content Includes" headings on the Vibration Institute's current Introduction to Machinery Vibration (IMV) course page: Vibration Sources and Use, Basic Machinery Vibration, Data Collection and Analysis, Machine Characteristics, Vibration Instruments, Vibration Testing, Basic Analysis, and Vibration Severity.
They are unweighted preparation-curriculum headings. The issuer has not published them as an eight-domain examination blueprint with percentages, and nothing in the available sources supports claiming that, say, Basic Analysis is worth a particular share of your score. Anyone who gives you precise domain percentages for this exam is inventing them.
For the broader picture of the credential itself, see What Is CVA Certification?, and when you are ready to test your recall under realistic conditions, the CVA practice tests are the natural next step.
Where the Sources Disagree
A careful candidate should know that the Vibration Institute's own materials do not line up perfectly. Rather than smoothing this over, it is better to understand it, because it affects how you prioritize study.
The historical handbook competency headings
The Vibration Institute's Certification Handbook for Vibration Analyst Categories I-IV, Revision 10 (December 13, 2022), contains a Body of Knowledge on pages 16-23. It marks Category I topics under eight competency headings: Vibration Principles, Data Acquisition, Signal Processing, Condition Monitoring, Fault Analysis, Corrective Action, Equipment Knowledge, and Acceptance Testing. That structure references ISO 18436-2 Annex A.
These eight competency headings are a different set from the eight IMV course headings. They are best used as a historical cross-reference, not as a reconciled current blueprint.
Known inconsistencies
- The current HTML Body of Knowledge page omits a Category I mark for Acceptance Testing, while the retrieved handbook and the Category I training-topic page include it.
- The current analyst-categories page repeats Data Acquisition under different topic groups and differs from the older handbook's category assignments.
- A newer 2025 handbook is linked from the site's navigation, but it could not be retrieved from either host, so its revision number and contents should not be assumed.
| Framework | Headings | Status |
|---|---|---|
| IMV course content (this guide's eight domains) | Vibration Sources and Use; Basic Machinery Vibration; Data Collection and Analysis; Machine Characteristics; Vibration Instruments; Vibration Testing; Basic Analysis; Vibration Severity | Current course page; unweighted; partial preparation |
| 2022 handbook Body of Knowledge | Vibration Principles; Data Acquisition; Signal Processing; Condition Monitoring; Fault Analysis; Corrective Action; Equipment Knowledge; Acceptance Testing | Historical cross-reference; Rev. 10 |
Key Takeaway
Study to the union of both lists. Use the IMV headings for structure, then confirm you can also handle signal processing, condition monitoring, fault analysis, corrective action and acceptance testing concepts, since those appear in the handbook's Category I marks.
Domains 1-3: Sources, Machinery Basics and Data
Domain 1: Vibration Sources and Use
This opening domain establishes why machines vibrate and why measuring that vibration is useful. Expect to connect physical causes to measurable symptoms.
- Common excitation sources in rotating machinery, such as unbalance and misalignment
- How vibration measurement supports condition monitoring decisions
- The relationship between a machine's forcing mechanisms and the frequencies you observe
Domain 2: Basic Machinery Vibration
The fundamentals domain. Candidates must be fluent in the vocabulary and the math that the rest of the exam assumes.
- Amplitude, frequency and phase, and how each is expressed
- Displacement, velocity and acceleration, including when each is the appropriate parameter
- Peak, peak-to-peak and RMS measures and how to convert between them
- Period, frequency and orders of running speed
Domain 3: Data Collection and Analysis
This is where measurement practice meets interpretation. The handbook's reference to calculations and interpretation of plots, tables and charts makes this a domain where hands-on familiarity pays off.
- Choosing measurement points, directions and consistent collection routes
- Reading time waveforms and frequency spectra
- Recognizing how collection setup affects data quality
- Trending data over time rather than judging a single reading in isolation
These three domains form the foundation. Candidates who rush past Domain 2 tend to struggle later, because unit conversions and the parameter relationships recur in nearly every subsequent topic. For a sense of how challenging the material is for different backgrounds, read How Hard Is the CVA Exam?
Domains 4-6: Machines, Instruments and Testing
Domain 4: Machine Characteristics
Knowing the equipment matters because the same vibration reading means different things on different machines. The handbook's Equipment Knowledge heading maps closely to this domain.
- Common machine types and their typical vibration signatures
- Bearings, gears, belts and couplings as vibration contributors
- Natural frequencies and resonance, and why they change diagnosis
- Basic machine construction details that influence where and how to measure
Domain 5: Vibration Instruments
Candidates need to understand the measurement chain, from sensor to displayed result, well enough to spot when a result cannot be trusted.
- Transducer types, such as accelerometers and velocity pickups, and their typical uses
- Mounting methods and how mounting affects frequency response
- Data collectors and analyzers, and the role of settings such as frequency range and resolution
- Cabling, grounding and other sources of measurement error
Domain 6: Vibration Testing
This domain covers structured tests used to learn about a machine or structure beyond routine monitoring.
- Purpose and setup of common diagnostic tests
- Identifying natural frequencies and resonance conditions
- Using test results to support or rule out a suspected cause
- Safe, repeatable test practice and documentation
Domains 7-8: Basic Analysis and Severity
Domain 7: Basic Analysis
The diagnostic core of Category I. You apply spectrum and waveform reading to recognize common faults.
- Identifying running-speed harmonics and what they suggest
- Distinguishing unbalance, misalignment and looseness from their spectral patterns
- Recognizing early signs of rolling-element bearing and gear problems
- Using phase and orientation to support a diagnosis
Domain 8: Vibration Severity
Once you have a reading, you must judge whether it matters. This domain addresses how severity is assessed and communicated.
- Applying severity criteria and guidelines to measured values
- Understanding why severity depends on machine class, speed and mounting
- Using trends and alarm limits to decide on action
- Communicating findings and recommended corrective action clearly
Severity connects directly to the handbook's Corrective Action and Acceptance Testing headings, which is why those themes deserve review even though they are not named in the IMV list. Pair this section with the quick-reference material in the CVA cheat sheet when you drill formulas and relationships.
Exam Format and What the Handbook Says
The only exam-format details available come from the retrieved 2022 handbook, and they should be read as historical, not as a guaranteed description of today's test.
| Item | Per 2022 handbook (Rev. 10) |
|---|---|
| Question type | Multiple choice, including calculations and interpretation of plots, tables and charts |
| Question count | 63 total: 60 scored plus three unmarked beta questions |
| Time | Two hours |
| Reference materials | Closed book, with equations supplied |
| Calculator | Nonprogrammable scientific calculator recommended for Category I |
| Prohibited | Smartphones and separate scrap paper |
Separately, the IMV course page describes a typical two-hour Category I examination outside the four-day course agenda, subject to scheduling changes. Course hours and examination duration are different things; do not confuse the 30-hour training requirement with the length of the test.
Scoring
The handbook uses exam-specific psychometric (Angoff) cut scores. There is no universal 70% threshold, and a fixed percentage borrowed from another credential does not apply here. For a fuller discussion, see CVA Passing Score and CVA Pass Rate, both of which should be read with this caveat in mind.
Eligibility and Registration Mechanics
Registration is a gated process, and application approval must come before you test. A full walkthrough lives in CVA Requirements, but the essentials are:
- Training: 30 hours of qualifying training. Training from another organization may qualify.
- Experience: six months of relevant vibration-analysis or condition-monitoring experience.
- Application: the currently linked CF009 Application for Examination and Certification of Vibration Analysts (Revision 16, August 18, 2020) requires documentary evidence of training and employer or professional-associate verification of experience. Formal education information is optional.
- Conduct: comply with photo-identification and ethics requirements.
- Proctoring: VI-approved proctors administer examinations at the Institute's office, after courses, in approved private sessions and through international representatives.
Costs at a glance
| Item | Amount (USD) |
|---|---|
| Initial examination (U.S.) | 360 |
| First retest within 12 months of initial exam | 150 |
| Subsequent retests | Regular examination fee |
| IMV course, member | 2,125 |
| IMV course, nonmember | 2,225 |
The IMV course price does not include the examination, which is an additional USD360. Its four-day agenda meets the 30-hour training requirement, which makes it the most direct route for candidates without prior qualifying coursework. For the complete financial picture, see CVA Certification Cost, and for timing, CVA Exam Dates.
Sequencing the Domains in a Study Plan
Generic study advice is plentiful; what helps here is ordering the domains so that later topics build on earlier ones. The plan below is one reasonable sequence, not an official schedule.
Foundations: Domains 1 and 2
- Master amplitude, frequency, phase and the displacement-velocity-acceleration relationships
- Practice peak, peak-to-peak and RMS conversions until automatic
Measurement: Domains 5 and 3
- Review transducers, mounting and analyzer settings
- Practice reading waveforms and spectra from sample plots
Machines and tests: Domains 4 and 6
- Link machine components to expected frequencies
- Review resonance and natural-frequency testing logic
Diagnosis and judgment: Domains 7 and 8
- Drill fault-pattern recognition from spectra
- Apply severity criteria and practice recommending corrective action
Place instruments before data collection because you cannot judge data quality without knowing how it was captured. Leave basic analysis and severity for last because they draw on everything earlier. Reserve the final days for mixed practice under closed-book conditions with only the reference equations, using the CVA practice test to expose weak areas, and revisit the broader CVA study guide for pacing.
Five-Year Cycle and Renewal
Certification lasts five years. Renewal can be earned by points or by re-examination.
- By points: 23 points are required, with at least one experience point in each certification year, no significant interruption in relevant work, and documented professional development. Experience contributes at most 20 points per cycle, and technical training earns 0.1 point per contact hour. The fee is USD100 for U.S. residents and USD150 internationally.
- By examination: the posted U.S. Category I renewal-examination fee is USD275.
Because experience points are capped, steady technical training and documentation across the cycle matter. Begin tracking contact hours from day one rather than reconstructing them in year five.
Career context
Category I is a practitioner credential used by people who collect and interpret machinery vibration data, often in reliability, maintenance and condition-monitoring roles. When weighing the investment, separate role-based earnings from any certification-specific premium: pay generally reflects occupational experience and responsibilities, and no Category I-specific salary premium has been verified. See CVA Salary Guide, CVA Jobs and Is the CVA Certification Worth It? for a qualitative treatment of these questions.
Frequently Asked Questions
No. They reproduce the Introduction to Machinery Vibration course headings and are unweighted preparation-curriculum headings, not a verified eight-domain exam blueprint or a source of official percentages.
The issuer calls IMV partial preparation. The four-day agenda satisfies the 30-hour training requirement, but you should also review the broader Body of Knowledge topics and practice calculations and plot interpretation.
The retrieved 2022 handbook describes 63 multiple-choice questions in two hours, with 60 scored and three unmarked beta questions. A newer handbook could not be retrieved, so confirm current details with the Vibration Institute before testing.
The handbook uses exam-specific psychometric (Angoff) cut scores rather than a universal percentage. No fixed 70% threshold applies to this credential.
The first retest costs USD150 when taken within 12 months of the initial examination. Later retests cost the regular examination fee, currently USD360 for the U.S. initial examination.