ST-591 Noise Dosimeter
Technical Specifications
ST-12D Class 1 Integrating SLM
SV 977D is a high-performance optical speed sensor designed for precise, non-contact vehicle speed measurement using advanced Doppler technology. It provides high-frequency data output with excellent accuracy and repeatability, ensuring reliable performance across various road surfaces and environmental conditions.
The sensor supports real-time data acquisition and seamless integration with CAN bus and data logging systems. With its robust construction, low latency, and high resolution, SV 977D is ideal for automotive testing, braking analysis, and vehicle dynamics evaluation.
Key Features
- Compliant with IEC 61252-1:2017 standard for occupational noise exposure measurement
- Supports real-time 1/1 and 1/3 octave band analysis for detailed noise evaluation
- Dual-channel design allows simultaneous evaluation using two different noise profiles
- Data logging and audio recording with up to 64 GB internal memory
- USB-C connectivity for fast data transfer, audio export, and charging
- Wide frequency range (20 Hz to 12.5 kHz) with high-precision condenser microphone
- Lightweight, compact, and wearable design for all-day monitoring
- IP65-rated enclosure for durability in harsh environments
- Up to 10 hours battery life for full-shift operation
- Measures multiple parameters including dose, Leq, peak, and statistical noise data
- Supports compliance with multiple standards such as OSHA, NIOSH, MSHA, ACGIH and EU directives
- Free PC software (ScarletSound) for data management, analysis, and reporting
Applications
Vehicle speed and performance testing
Brake testing and stopping distance analysis
Automotive research and development (R&D)
Vehicle dynamics and motion analysis
ADAS and safety system validation
Testing in varying road and weather conditions
Real-world driving data collection
Integration with CAN-based systems for diagnostics
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Standards
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Measurement range
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Measurement modes
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Main parameters of measurement
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Frequency range
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Frequency weightings
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Time weightings
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Measurement time
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Audio recording
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Display
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Microphone
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Storage capacity
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Output interface
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Power supply
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Ingress protection
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Operating environment
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Dimensions
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Weight
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IEC 61252-1 2017 Standard
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IP65 Ingress Protection
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240x240 pixels full-color display
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1 sec - 99 hrs adjustable measurement time
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Data logging & audio recording functions
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Real-time 1/1 OCT & 1/3 OCT analysis
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Why Choose ST-591?
Designed for accurate noise measurements in various applications
IEC Compliance
Meet the IEC 61252-1 2017 standard for personal noise dosimeter.
IP65 Certified
Water-resistant protection making it durable for use in tough environments.
Audio Recorder
Record in WAV format with with synchronized and trigger modes
Long Runtime
Up to 10 hours of operation to support full-shift usage
Efficient Noise Data Management on Your PC
ScarletSound is a free software developed for ST-591 noise dosimeter, enabling occupational noise exposure assessment directly from your computer.
With ScarletSound, users can:
– Easily manage and organize noise data logs
– Review of 1/1 & 1/3 OCT analysis
– Access and playback recorded audio files
– Export data for documentation or further analysis
Precise 1/1 & 1/3 OCT Analysis
ST-591 features 1/1 and 1/3 octave band analysis, which divides the sound spectrum into smaller bands for detailed monitoring and analysis.
Built for Safety Standards Compliance
Compliant with OSHA, NIOSH, MSHA, and more noise exposure standards, the ST-591 ensures regulatory adherence while protecting employees from noise-induced hearing loss (NIHL). With its dual independent channels, ST-591 evaluates same noise exposure under different configurations, providing flexibility for standard-compliant noise assessments.
Have Questions? Get in Touch
What is the ST-591 Noise Dosimeter and where is it used?
ST-591 Noise Dosimeter is a high-performance wearable device designed to measure personal noise exposure in industrial and workplace environments. It is widely used in occupational health, construction, manufacturing, and compliance testing to prevent hearing damage.
What makes ST-591 different from standard noise dosimeters?
The ST-591 offers advanced analysis capabilities, including real-time 1/1 and 1/3 octave band analysis, allowing engineers to evaluate not just noise levels but also frequency distribution. It also features a dual-channel design, enabling simultaneous evaluation against two regulatory standards.
What standards and regulations does ST-591 comply with?
The device complies with major international standards such as:
- IEC 61252-1 (personal noise dosimeter standard)
- IEC 61672 (sound level measurement)
- OSHA, NIOSH, MSHA, ACGIH, and EU Directive 2003/10/EC
This makes it suitable for global occupational safety compliance and certification.
What are the key measurement capabilities of ST-591?
The ST-591 measures a comprehensive set of parameters including:
- TWA (Time Weighted Average), %Dose, Leq, SEL, Peak levels
- Statistical noise values (L10, L50, L90, etc.)
- Frequency weightings (A, C, Z) and time weightings (Fast, Slow, Impulse)
- Audio recording (WAV format) for event analysis
It also provides a wide measurement range up to ~142 dB and frequency range from 20 Hz to 12.5 kHz, making it suitable for diverse environments.
What features make ST-591 suitable for real-world industrial use?
Key advantages include:
- Up to 10–13 hours battery life for full-shift monitoring
- 64 GB internal memory for long-term data logging
- IP65-rated rugged design for harsh environments
- USB-C and Bluetooth connectivity for fast data transfer
- Integration with ScarletSound software for reporting and analysis
These features ensure reliable, all-day monitoring in demanding field conditions.