To stand out from their competitors, meet customer specifications (low noise limit, acoustic discretion) or regulatory requirements (Noise Directive 2000/14/EC, Machine Directive 2006/42/EC, Delegated Regulations (EU) 2019/945 and 2020/1058 for drones, etc....), manufacturers need to know the noise levels of their products. LNE meets this need by measuring sound pressure or power, in particular to ISO 3744 standard, under COFRAC* accreditation.
Why carry out acoustic measurements?
Noise is often synonymous with nuisance. Hence noise is usually the subject of regulations or industrial specifications to which equipment manufacturers must comply. Noise is also associated with the ease of use of many consumer products, making it a key element of marketing strategy to meet consumer expectations and stand out from the competition.
In addition, military equipment manufacturers have to meet acoustic discretion requirements, making it necessary to qualify these products in an environment with very low background noise levels.
Proposed acoustic tests
As an expert in acoustics, a test provider (power, absorption, electroacoustics) and a metrologist (primary acoustic metrology laboratory), LNE has the skills (dedicated team of acoustics engineers and technicians) and resources (semi-anechoic room and instrumentation) to support manufacturers in qualifying their products:
- Measuring sound pressure and determining sound power;
- Calibration of reference sound sources according to ISO 6926;
- Fine-band spectra (FFT), time evolution;
- Help with product development and finalization;
- Verification, certification, compliance with the standards, specifications and regulations...
Means for measuring product noise levels
LNE has a semi-anechoic "laboratory" precision chamber, 110 m3 in size, with a background noise < 16 dBA (< 30 dB Lin) and a cut-off frequency of 120 Hz. This performance enables noise measurements to be taken on a wide range of equipment, including those whose noise is close to the threshold of hearing (application to acoustic discretion on military equipment).
For bulky equipment, particularly for outdoor use, these tests can be carried out on LNE's outdoor test track or at the customer's site.
Our laboratories in video (French version)
Characteristics of our equipment
| Equipments |
Specifications |
Usage |
|---|---|---|
| Semi-anechoic chamber |
|
Test room for controlled environmental conditions |
| Acquisition system |
|
Indoors, outdoors or on customer premises |
| Sound level meters |
|
Indoors, outdoors or on customer premises |
| Outdoor test track |
|
Dedicated to large materials/equipments; Semi-anechoic chamber for testing under controlled environmental conditions; Outdoor equipment noise measurement |
Semi-anechoic room for tests under controlled environmental conditions
Measuring equipment noise outdoors
Regulations and standards
LNE provides sound level measurements in accordance with the following regulations and standards:
- ISO 3744;
- ISO 3745, ISO 3746;
- ISO 6926;
- MIL-STD-740-1, MIL-STD-1474;
- IEC 60601-1, IEC 60601-1-8;
- NF EN ISO 7779;
- EN 17645, ISO 20361;
- Outdoor Noise Directive 2000/14/EC, 2005/88/EC, Delegated Regulation (EU) 2024/1208 and related products standards;
- Delegated Regulation (EU) 2019/945 and 2020/1058 for drones;
- Machine Directive 2006/42/EC - Regulatin (EU) 2023/1230.
Accreditations
NEW! Measurements of sound power levels on reflecting surfaces (ISO 3744, ISO 6926, product standards, etc.) and acoustic measurements in accordance with IEC 60601-1-8 §6.3.3.2 are now performed under COFRAC* accreditation no. 1-0606.
*List of sites and scopes available at www.cofrac.fr
Products concerned
LNE can carry out acoustic tests on all types of equipment, such as:
- Swimming pool pumps, filtration systems, water treatment systems;
- Sound sources;
- Drones;
- Military equipment;
- Telecommunications racks;
- Gardening equipment;
- Air conditioning systems;
- Medical devices;
- Alarms;
- Hardware;
- Portable tools;
- Appliances;
- Road equipment;
- Construction equipment.
Why choose LNE Group?
The only European notified body to offer a complete range of outdoor equipment assessment services (noise emission measurements, CE certificates of conformity, in-process inspections).
Participation of its experts in regular standardization committees (ISO and Afnor): AFNOR S30B and ISO/TC43/SC1WG28
In charge of studies for the French Ministry of the Ecological Transition and the European Commission (inter-laboratory comparisons, development of test codes, control measurements, etc.).
