AWA5661 Precision Pulse Sound Level Meter
| Origin | Zhejiang, China |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Domestic (China) |
| Model | AWA5661 |
| Pricing | Upon Request |
Overview
The AWA5661 Precision Pulse Sound Level Meter is a compact, high-accuracy acoustic measurement instrument engineered for rigorous compliance with international electroacoustic standards. Designed in accordance with IEC 61672-1:2002 Class 1 and GB/T 3785 Type 1 specifications, it employs digital true-RMS detection technology to ensure exceptional long-term stability, low drift, and high reproducibility across repeated measurements. Its core transduction principle relies on a free-field 12.7 mm condenser microphone—polarized at 0 V for standard variants (AWA5661, AWA5661A, AWA5661B) and 28 V for the high-SPL AWA5661C variant—coupled with precision analog signal conditioning and 24-bit ADC sampling. The instrument supports simultaneous time-weighted (Fast, Slow, Impulse) and frequency-weighted (A-weighting, Linear) sound pressure level (SPL) evaluation, with real-time peak detection capability when interfaced with host software. Its modular architecture enables seamless integration with external octave (AWA5721) or 1/3-octave (AWA5722) filter sets for spectral analysis in accordance with ISO 266 and ANSI S1.11.
Key Features
- Class 1 accuracy per IEC 61672-1:2002 and GB/T 3785, validated by national metrological institutes
- Digital true-RMS detector with crest factor ≥10, enabling accurate assessment of impulsive and transient noise events (e.g., gunfire, mechanical impact, switchgear arcing)
- Four model variants optimized for distinct dynamic ranges: AWA5661 (general-purpose), AWA5661A (enhanced stability & low-noise floor), AWA5661B (low-level measurement down to 20 dB(A)), and AWA5661C (high-level measurement up to 160 dB(A))
- Integrated RS232C serial interface supporting remote control, real-time data streaming, and automated logging via PC-based acquisition software
- Low-power design powered by four AA alkaline cells (LR6) or external 5–9 V DC supply; typical battery life exceeds 20 hours under continuous operation
- Robust ABS engineering plastic enclosure (220 × 22 × 22 mm), IP54-rated for dust and splash resistance in field environments
- Backlit 3.5-digit LCD display with dedicated indicators for battery voltage, under-range, and over-range conditions
Sample Compatibility & Compliance
The AWA5661 series is calibrated for free-field response and is suitable for measuring airborne sound pressure from diverse sources—including industrial machinery, HVAC systems, transportation noise (road, rail, aviation), construction equipment, and consumer appliances. It meets the technical requirements for occupational noise monitoring under OSHA 29 CFR 1910.95 and EU Directive 2003/10/EC. When used with traceable calibration (e.g., using AWA6221B calibrator per IEC 60942), measurement data satisfies GLP and ISO/IEC 17025 documentation requirements. All variants support A-weighted Leq, Lmax, Lmin, and Lpeak reporting—essential for regulatory submissions to environmental agencies such as the U.S. EPA, UK EA, or China MEE.
Software & Data Management
The meter communicates natively with Windows-based configuration and analysis software via RS232C, enabling full parameter programming (time/frequency weighting, integration period, trigger thresholds), real-time waveform capture, and post-processing of statistical metrics (LN, SEL, TWA). Data export is supported in CSV and TXT formats for compatibility with MATLAB, Python (SciPy/Pandas), and industry-standard noise modeling tools (e.g., SoundPLAN, CadnaA). Audit trails, user authentication, and electronic signatures are configurable to meet FDA 21 CFR Part 11 and ISO 13485 requirements where applicable. Firmware updates are delivered through secure USB-to-serial adapters with version-controlled release notes.
Applications
- Industrial hygiene surveys for worker exposure assessment per ISO 9612 and ANSI S12.19
- Environmental noise mapping and complaint investigation in residential, commercial, and mixed-use zones
- Product noise certification testing for CE marking (EN ISO 3744, EN ISO 3746) and ENERGY STAR compliance
- Acoustic validation of enclosures, mufflers, and active noise control systems
- Research-grade impulse noise characterization in aerospace, defense, and materials science laboratories
- Educational use in undergraduate acoustics labs for hands-on instruction in sound propagation, psychoacoustics, and instrumentation principles
FAQ
What calibration standards does the AWA5661 comply with?
It conforms to IEC 61672-1:2002 Class 1 and GB/T 3785 Type 1 for sound level meters, with traceable calibration performed against national primary standards.
Can the AWA5661 perform 1/3-octave analysis without external hardware?
No—octave and fractional-octave band analysis requires connection to the optional AWA5722 1/3-octave filter set via its analog output port.
Is the RS232C interface compatible with modern laptops lacking serial ports?
Yes—standard USB-to-RS232 adapters (FTDI chipset recommended) enable plug-and-play connectivity with Windows, macOS, and Linux systems.
Does the instrument support data logging without a computer?
No internal memory is provided; continuous logging requires live connection to a host PC or external data logger with RS232 input.
What is the recommended recalibration interval?
Annual calibration is advised per ISO/IEC 17025 and manufacturer guidelines, or after any physical shock, extreme thermal cycling, or performance deviation exceeding ±0.3 dB.
