Sound Level Meter Selection Guide: A Comprehensive Analysis from Basic Parameters to Application Scenarios

A sound level meter is a professional instrument used to measure environmental noise intensity. It is widely applied in environmental protection, occupational health, product quality, and other fields. This article comprehensively analyzes key selection criteria for sound level meters, covering core parameters and application scenarios.

## Frequency Weighting: Differences and Applications of A, C, and Z

Frequency weighting simulates how the human ear perceives sound at different frequencies. A-weighting (dBA) most closely matches human response to moderate-level sounds and is the standard for environmental noise monitoring. C-weighting (dBC) is more sensitive to low frequencies, making it suitable for scenarios with rich bass content, such as mechanical noise or explosions. Z-weighting (dBZ) provides a linear response without frequency correction and is used in acoustic research and spectrum analysis.

Lixin Electronic Technology (Baiantu)'s ET-958 Sound Level Meter supports A/C/Z weighting switching to meet diverse measurement requirements.

## Time Weighting: Choosing Between Fast and Slow

Time weighting determines how quickly the instrument responds to sound changes. Fast time constant is 125 ms, suitable for fluctuating noise. Slow time constant is 1 s, providing stable readings ideal for steady-state noise. Impulse time constant is 35 ms, specifically designed for impulse noise measurement.

Difference Between Accuracy Class 1 and 2

The IEC 61672 standard classifies sound level meters into Class 1 (precision) and Class 2 (general). Class 1 has an accuracy within ±0.7 dB, suitable for laboratories and regulatory enforcement. Class 2 has an accuracy within ±1.0 dB, ideal for field measurements and general industrial applications. Leixin Electronic Technology products comply with the IEC 61672-1 2 standard and can provide CNAS calibration certificates.

## Typical Use Cases

Environmental Noise Monitoring: Compliance testing for urban traffic, construction site, and social life noise using A-weighting and Fast time weighting.

Industrial Noise Assessment: Measure equipment noise in factory workshops to evaluate hearing protection needs for employees. Typically uses A-weighting and Slow time weighting.

Product Quality Testing: Noise quality assessment for appliances, automobiles, and other products requires a 1-class sound level meter with spectrum analysis capabilities.

Select a sound level meter based on your measurement objectives, accuracy requirements, and operating environment. Leixin Electronic Technology offers a complete product line from entry-level to professional grade. Contact us for selection recommendations.