ISO 4869-1 — Hearing protectors — Subjective method for the measurement of sound attenuation
Attenuation of hearing protectors. Relevant to hearing conservation programmes under Thai occupational noise rules.
At a glance
- Standard
- ISO 4869-1
- Published by
- International Organization for Standardization
- Title
- Hearing protectors — Subjective method for the measurement of sound attenuation
- Status at ALT
- R&D measurement — not accredited
Accreditation status
This is R&D and development measurement, not an accredited service. It is used where the question is "did it improve?" rather than "does it comply?" — the method is documented and the conditions are recorded, so results are comparable between iterations, but no accreditation is claimed.
Before you commit to this standard
Two things decide whether a result to this standard will be accepted: whether the measurement was made by a laboratory whose scope covers it, and whether the specimen and conditions matched what the standard actually requires. A number produced outside either of those is not wrong, but it is not evidence either.
If you are not certain which standard your specification calls for — and specifications frequently name a superseded edition, or name an ISO standard where the ASTM equivalent is what the market expects — send us the clause and we will tell you what it means in practice before you spend anything.
Standards usually specified alongside it
| Standard | What ALT does with it | Status |
|---|---|---|
| IEC 60268-16 Sound system equipment — Objective rating of speech intelligibility by speech transmission index | Speech transmission index for public address, alarm and voice evacuation systems. | R&D measurement — not accredited |