Vibration meter calibration: how often, to which standards, and how
A vibration meter measures machinery vibration, typically as RMS velocity, acceleration, or displacement, using an attached accelerometer and signal processing electronics. It is used for condition monitoring and acceptance testing of rotating and reciprocating machinery. Calibration of the complete measuring chain against a reference transducer keeps severity readings comparable across machines and over time.
Also known as: vibration analyzer, vibration severity meter, vibrometer, vibration tester, machinery vibration meter
How often should a vibration meter be calibrated?
Where this number comes from
No standard mandates a calendar interval; calibration guides and laboratories generally recommend recalibrating vibration meters every 12 months, with shorter intervals for harsh service. The interval is a risk-based user decision per the ILAC-G24 / OIML D 10 methodology.
Calibration intervals are a risk-based decision for the instrument owner, not a fixed rule: guidance documents such as ILAC-G24 and OIML D 10 describe how to set and adjust them from usage, criticality and calibration history. Treat the interval above as a starting point for your own quality system, not a compliance requirement.
What shortens or lengthens the interval
- Harsh industrial environments with heat, moisture, and dust that stress the transducer and cables
- Handling risk: dropped probes or magnet-mounted accelerometers snapping onto surfaces can shift sensitivity
- Criticality of decisions taken from readings, such as machine protection trips or acceptance tests against ISO severity limits
- Wear in connecting cables, connectors, and mounting hardware that changes the frequency response
- As-found drift history from previous certificates, which supports extending or shortening the interval
Standards relevant to vibration meter calibration
Defines the comparison calibration method used to calibrate the meter's transducer and measuring chain on a vibration exciter, covering 0.4 Hz to 10 kHz
Specifies accuracy and performance requirements for vibration severity instruments that indicate RMS vibration velocity on rotating and reciprocating machinery
Standards are referenced by designation and title. For normative requirements, always work from the current edition of the standard itself.
How a vibration meter is calibrated
A typical vibration meter calibration, in an accredited lab or in-house, follows this outline. The exact points, tolerances and paperwork come from the applicable standard and your own procedure.
- Inspect the meter, accelerometer, cable, and mounting hardware, and record identification and settings
- Mount the meter's accelerometer on a calibration exciter together with, or back-to-back against, a reference transducer per ISO 16063-21
- Apply sinusoidal excitation at a reference point, commonly 10 m/s2 at 159.2 Hz, and record the as-found indicated value
- Sweep discrete frequencies across the meter's specified range to verify frequency response of the complete chain
- Vary excitation amplitude at a fixed frequency to check amplitude linearity
- Verify the displayed quantities (acceleration, velocity, displacement, RMS and peak detection) against the reference values
- Compare errors with the manufacturer specification or ISO 2954 accuracy requirements, adjust if supported, and record as-left values with uncertainty
Reference equipment typically used
- Vibration exciter (electrodynamic shaker) with low distortion
- Reference standard accelerometer with traceable sensitivity and signal conditioner
- Portable vibration calibrator (for example 10 m/s2 at 159.2 Hz) for single-point checks
- Dynamic signal analyzer or precision voltmeter
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Sources
- ISO 16063-21:2003, Methods for the calibration of vibration and shock transducers - Part 21: Vibration calibration by comparison to a reference transducer, ISO
Existence and scope of the comparison calibration method and its 0.4 Hz to 10 kHz frequency range
- How to Calibrate a Vibration Meter (ISO 16063 Procedure), CalibrationOS
Interval claim: typical calibration interval of 12 months; also the ISO 16063-21 comparison procedure, the 159.2 Hz reference frequency, and frequency response and linearity checks
- ISO 2954:2012, Mechanical vibration of rotating and reciprocating machinery - Requirements for instruments for measuring vibration severity, ISO
Instrument accuracy and performance requirements for vibration severity instruments used as acceptance criteria