HS5618A Integrated Sound Level Meter

Overview

The HS5618A Integrated Sound Level Meter is a compact, microprocessor-controlled instrument engineered for precision environmental and occupational noise assessment in accordance with IEC 61672-1:2013 Class 2 requirements. It operates on the fundamental principle of acoustic pressure transduction—converting sound pressure fluctuations into proportional electrical signals via a calibrated electret condenser microphone—and applies standardized frequency and time weightings to compute legally recognized metrics including equivalent continuous sound level (L_eq), maximum sound level (L_max), instantaneous sound pressure level (L_p), sound exposure level (L_ae), and noise dose (DL %). Designed for field-deployable reliability, the HS5618A supports both short-term spot measurements and extended-duration integrations up to 24 hours, making it suitable for compliance monitoring under national environmental protection regulations, occupational health standards (e.g., OSHA 29 CFR 1910.95 and EU Directive 2003/10/EC), and community noise impact studies.

Key Features

• IEC 61672-1:2013 Class 2 certified performance for accuracy, linearity, and stability across its full operating range (35–130 dB(A/C))
• Dual-frequency weighting networks (A and C) enabling simultaneous evaluation of low-frequency energy and human-perception-weighted noise
• Automatic range switching with ≤1 dB linearity error ensures consistent measurement fidelity without manual gain adjustment
• Real-time 64×128 dot-matrix LCD display with integrated clock supports timestamped data logging and scheduled autonomous operation
• Configurable integration intervals—from 10 seconds to 24 hours—with programmable auto-start functionality for unattended monitoring
• Onboard memory stores up to 500 individual measurement events plus four hourly summary datasets for trend analysis
• RS-232C serial interface compliant with standard PC communication protocols for direct data export to spreadsheet or database software
• Robust mechanical design (307 × 80 × 30 mm) optimized for handheld use in industrial, municipal, and educational environments

Sample Compatibility & Compliance

The HS5618A is validated for use with standard 1/2-inch electret condenser microphones (included with windscreen) and compatible acoustic calibrators (optional accessory, e.g., 94 dB/114 dB @ 1 kHz). Its measurement architecture meets the metrological traceability requirements of ISO/IEC 17025-accredited laboratories when operated within specified environmental conditions (15–30 °C, relative humidity < 80%, non-condensing). While not inherently FDA 21 CFR Part 11 or GLP-compliant due to lack of audit-trail firmware, the device supports documentation integrity through timestamped CSV exports and external calibration certificate linkage—enabling alignment with ISO 14001 environmental management systems and OHSAS 18001/ISO 45001 occupational health and safety frameworks.

Software & Data Management

Data acquisition is managed via RS-232C serial link using vendor-provided Windows-compatible software (distributed on included CD-ROM), which enables batch download, spectral annotation, statistical reporting (L₁₀, L₅₀, L₉₀, SD), and graphical time-history plotting. The software supports export to .csv and .xls formats for integration with enterprise-level environmental information systems (EIS) or regulatory reporting platforms such as EPA’s ECHO or EU’s E-PRTR. No cloud connectivity or mobile app support is provided; all processing occurs locally to ensure data sovereignty and compliance with institutional IT security policies.

Applications

• Environmental noise mapping around transportation corridors, construction sites, and industrial perimeters
• Workplace noise exposure assessment for hearing conservation program compliance (e.g., 8-hour TWA, peak C-weighted levels)
• Educational acoustics demonstrations and student laboratory experiments in physics and environmental science curricula
• Community noise complaint investigations by municipal health departments and environmental agencies
• Pre- and post-mitigation verification of noise control interventions (barriers, enclosures, mufflers)
• Baseline surveys for Environmental Impact Assessments (EIAs) under national regulatory frameworks

FAQ

Is the HS5618A suitable for legal enforcement or regulatory reporting?
Yes—when used with a traceably calibrated microphone and documented calibration history, its IEC 61672-1 Class 2 conformance satisfies evidentiary requirements for many national and local noise ordinances.
Can measurement data be exported directly to Excel or statistical software?
Yes—the included PC software exports fully timestamped datasets in comma-separated (.csv) format, compatible with Microsoft Excel, MATLAB, R, and Python pandas workflows.
What is the battery life under typical field use?
With alkaline AA cells, continuous operation lasts approximately 25 hours at 25 °C; battery status is displayed continuously on the LCD screen.
Does the instrument support octave-band or 1/3-octave analysis?
No—the HS5618A is an integrating sound level meter only; it does not perform frequency-domain analysis. For spectral characterization, a dedicated analyzer (e.g., HS5660 series) is required.
Is external power supply necessary for long-term unattended logging?
Not mandatory—the internal battery system supports 24-hour integrations, but the DC 9 V input port enables indefinite operation when connected to a regulated external source.