DASM provides noise testing services for electrical cabinets in accordance with the international ISO 7779 standard, ensuring accurate evaluation of noise emissions from industrial and commercial equipment.
In various industrial sectors—particularly mechanical & electrical, equipment manufacturing, telecommunications, electronics, and data centers—equipment noise is a critical parameter requiring strict control.
During operation, electrical cabinets (Electrical Cabinets / Equipment Enclosures) may generate noise from sources such as:
- Cooling fans
- Transformers & inductors
- Relays
- Electronic circuitry
- Cooling or HVAC subsystems
Uncontrolled noise can negatively impact:
- Workplace environment
- Personnel health & safety
- System reliability in server rooms & data centers
- Export technical requirements
- Compliance with comfort & safety standards
Therefore, evaluating electrical cabinet noise in accordance with international standards is mandatory for many manufacturers targeting global markets.
ISO 7779: Global Standard for IT & Telecom Equipment Noise Measurement
What is ISO 7779?
ISO 7779 is an international standard defining the measurement methods for Sound Power Level and Sound Pressure Level of information technology, telecommunications, and office equipment.
Typical equipment within scope includes:
- Electrical cabinets / Server racks / Data cabinets
- Servers
- Switches, routers, adapters
- Small cooling & HVAC units
- Industrial computers
- Telecommunications equipment
Key Acoustic Parameters in ISO 7779 Electrical Cabinet Noise Testing
ISO 7779 focuses on parameters such as:
- LWA (A-weighted Sound Power Level)
- LpA (Sound Pressure Level at operator position)
- Tonality
- Work Mode (operating mode)
- Idle Mode (standby mode)
These parameters enable users, manufacturers, and certification bodies to compare, evaluate, and predict the noise impact under real-world conditions.
ISO 7779 Equipment Noise Measurement
Testing Procedure at DASM
At DASM, ISO 7779 equipment noise measurement tests are conducted in a controlled lab environment following standardized procedures.
- Equipment & Technical Preparation
Including:
– Model & rated power
– Operating modes
– Dimensions & mass
– Cooling configuration
- Acoustic Room Setup & Microphone Arrangement
The cabinet is placed in a laboratory with low background noise and compliant room acoustics.
Microphones are positioned at reference points in free-field or semi-free-field conditions depending on requirements.
- Data Acquisition & Analysis
The acoustic system measures and analyzes:
– A-weighted SPL
– A-weighted SWL
– 1/3 octave spectrum (optional)
– Tonality
- Reporting
Results are compiled into a standardized test report containing:
- Noise parameters
- Frequency analysis graphs
- Operating modes
- Technical notes
- Measurement uncertainties & conditions
Benefits for Manufacturers
Export & International Certification
Many global markets (EU – US – Japan) require noise declarations for imported industrial equipment.
Product Design Optimization
Noise data supports improvements in:
- Airflow & ventilation
- Sound insulation & absorption
- Cooling fan systems
- Noise–power optimization
Standard Compliance & Technical Declarations
ISO 7779 data can be used in:
- Datasheets
- Technical catalogs
- Compliance documentation
Acoustic testing services at DASM
DASM provides a comprehensive suite of services for enterprises, including:
- ISO 7779 noise testing
- International acoustic compliance (ISO – IEC – ASTM)
- Frequency spectrum analysis
- Noise reduction design consultancy
- Lab & on-site measurement
- Certification reports for technical dossiers
With a VILAS-accredited acoustic laboratory, DASM ensures accuracy, traceability, and competent compliance testing.
Other Acoustic Services at DASM
Beyond lab acoustic testing, DASM offers technical acoustic services such as:
- Noise survey & assessment
- Building acoustic consultancy
- Acoustic modeling & simulation
- Noise & vibration control
- Optimization for soundproofing materials/absorbing sound materials
ISO 7779 noise testing is a critical requirement for manufacturers of IT, telecom, and industrial equipment, especially as global supply chains demand higher standards, technical transparency, and certified data.
DASM is ready to support manufacturers through measurement, analysis, certification, and products optimization, helping enhance the competitiveness of Vietnam’s industrial equipment sector.
