HS5628 Integrated Sound Level Meter

Overview

The HS5628 Integrated Sound Level Meter is a compact, handheld instrument engineered for precision environmental and occupational noise assessment in accordance with internationally recognized metrological standards. It operates on the principle of electroacoustic transduction using a calibrated electret condenser microphone, followed by digital signal processing to compute time-integrated acoustic parameters. Designed to meet IEC 61672-1:2013 Class 2 requirements—and fully compliant with GB/T 3785.1–2010 (equivalent to IEC 651)—the device delivers traceable, repeatable measurements suitable for regulatory monitoring, workplace health & safety evaluations, and industrial noise source characterization. Its true RMS detection architecture ensures accurate representation of complex, non-sinusoidal noise waveforms, including impulsive and fluctuating signals commonly encountered in manufacturing, transportation, and urban environments.

Key Features

• Class 2-compliant performance per IEC 61672-1:2013 and GB/T 3785.1–2010, validated for field-deployable accuracy
• Dual-frequency weighting networks (A and C) enabling compliance evaluation against occupational exposure limits (e.g., OSHA 1910.95, ISO 1999) and environmental criteria (e.g., EU Environmental Noise Directive 2002/49/EC)
• Three manually selectable input ranges (High/Medium/Low), each offering ≥60 dB linear dynamic range—optimized for minimizing overload risk across diverse sound pressure levels
• Programmable measurement durations from 10 seconds to 24 hours, supporting standardized metrics including equivalent continuous sound pressure level (L_eq), sound exposure level (L_AE), statistical percentiles (L_max, L_min), standard deviation (SD), and total energy (E)
• Digital true RMS detector with peak factor ≥3, ensuring fidelity in capturing transient events without clipping or averaging artifacts
• Low-power design powered by two standard AA cells, delivering up to 20 hours of continuous operation under typical usage conditions
• Compact form factor (200 × 62 × 30 mm; 200 g with batteries) optimized for handheld survey work, personal dosimetry support, and extended field deployment

Sample Compatibility & Compliance

The HS5628 is intended for use with free-field or diffuse-field acoustic environments where incident sound pressure levels fall within its specified operating range (35–130 dB re 20 µPa). It accommodates standard 1/2″ microphone calibrators (e.g., pistonphones per IEC 60942) for on-site verification. The instrument satisfies technical requirements for routine environmental noise monitoring per national implementation guidelines of ISO 1996-1 and ISO 1996-2. While not certified for explosion-proof use, it is suitable for general industrial settings meeting IP54-equivalent ingress protection when operated within its specified temperature (−10 °C to +50 °C) and humidity (20–90% RH, non-condensing) limits. Calibration certificates traceable to national metrology institutes (e.g., NIM, China) may be provided upon request to support GLP-aligned data integrity protocols.

Software & Data Management

The HS5628 supports analog AC output for real-time connection to external data loggers, oscilloscopes, or spectrum analyzers—enabling synchronized multi-parameter acquisition. Although it does not feature built-in Bluetooth or USB storage, its measurement results are displayed directly on the 8×2 dot-matrix LCD and can be manually recorded for subsequent entry into laboratory information management systems (LIMS) or Excel-based reporting templates. For organizations requiring audit-ready documentation, the device’s manual timing mode and fixed-duration presets facilitate structured data collection aligned with ISO/IEC 17025 clause 7.7 (reporting of results) and support basic traceability in QA/QC workflows. No proprietary software is required; however, third-party tools compatible with analog voltage outputs may be used for waveform capture and post-processing.

Applications

• Environmental noise mapping near roadways, railways, airports, and construction sites per ISO 1996-2
• Workplace noise exposure assessment for compliance with national occupational hygiene standards (e.g., GBZ 2.2–2007 in China, OSHA PELs in the US)
• Industrial machinery noise diagnostics—including rotating equipment, HVAC systems, compressors, and power tools
• Educational acoustics laboratories for student experiments on sound propagation, attenuation, and frequency analysis
• Municipal noise ordinance enforcement and community complaint investigations
• Pre-commissioning and commissioning verification of noise control measures (e.g., enclosures, barriers, silencers)

FAQ

Is the HS5628 suitable for legal metrology or court-admissible noise evidence?
The HS5628 meets IEC 61672-1 Class 2 specifications, making it appropriate for routine monitoring and preliminary assessments—but not for legally binding measurements requiring Class 1 instrumentation or accredited calibration under ISO/IEC 17025.
Can the device perform octave or 1/3-octave band analysis?
No. The HS5628 is a broadband integrating sound level meter and does not incorporate real-time spectral decomposition capabilities.
What is the recommended calibration interval?
Annual calibration against an accredited acoustic calibrator (e.g., 1 kHz, 94 dB or 114 dB reference) is recommended; field verification before and after each measurement session is advised per ISO 9612.
Does the HS5628 support data logging with timestamps?
No internal memory or timestamping functionality is included; measurements must be manually logged or captured externally via AC output.
Is the microphone pre-polarized and field-replaceable?
Yes—the 1/2″ electret condenser microphone is permanently polarized and mechanically compatible with standard IEC 61094-4 mounts, allowing for replacement or recalibration by authorized service centers.