Required test record
| Field | Record |
|---|---|
| Sample | Model, version, motor, impeller, battery, housing and accessories |
| Environment | Room, reflective surfaces, ambient condition and background level |
| Position | Microphone distance, height, axis and fan orientation |
| Instrument | Meter, calibration status, weighting and time response |
| Operation | Mode, state of charge, stabilization time and test duration |
| Result | Repeated readings, variation, observations and acceptance rule |
Procedure
- Record the background level with the fan off.
- Mount or hold the sample in the agreed use orientation.
- Keep the meter position fixed and clear of the operator.
- Measure every declared mode after stabilization.
- Note rattles, tonal peaks, pulsing or vibration separately from the level.
- Repeat the run and retain raw readings.
Common comparison errors
- Comparing values measured at different distances.
- Ignoring room reflections or a high background level.
- Mixing low-speed and maximum-speed claims.
- Reporting only the lowest transient reading.
- Applying one sample result to a changed motor, impeller or housing.
A website label such as quiet or low noise is not a test result. Ask for the model, method, conditions and accepted limit.