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          • Analyzing Different Driving Situations
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          • Vehicle Environmental Tests
          • Distributed Data Acquisition
          • Heating & Air Condition Testing
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          • Pass-by Noise Test Overview
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Class 1 Sound Level Meter & Noise Measurement

The golden standard for sound noise level meter re-imagined with the Dewesoft approach. Easy to set up and use while ensuring maximum accuracy with certified compliance with international standards. No matter the type of acoustics measurement, a sound level meter is always at the heart of the sound  analysis.
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Class 1 Sound Level Meter

Class 1 sound level meter is designed to meet the requirements of IEC 61672. This standard specifies two levels of performance, Class 1 and Class 2, with Class 1 being effectively more accurate.

Within the standard are a set of performance criteria that a sound noise meter must meet and each of these has a tolerance associated with it.

​Dewesoft sound meter and sound level software module allows calculation typical parameters for the sound level measurement from a single microphone. It offers typical sound level meter calculations.
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Real-time Sound Analysis

Dewesoft sound level meter solution provides real-time octave filters in order to analyze a signal and output frequency domain data. The Octave Analysis option provides a time-based real-time octave band and 1/3 octave band measurements.

Additionally, 1/n octave can be post-processed for requirements that need 1/6 octave, 1/12 octave and 1/24 octave band spectral analysis.
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Microphone Calibration

In order to make scientific sound measurements with a microphone sensor,  a precise microphone sensitivity must be known. Microphone calibration will enable confidence in the performed measurements.

Since the calibration may change over the lifetime of the device, it is necessary to regularly calibrate the measurement microphone accurately.

Dewesoft allows a microphone to be calibrated in several different ways inside the Dewesoft software:
​Calibration with TEDS
With an external microphone calibrator
With manufacturer calibration certificate


​Dewesoft also provides professional certified IEC/ANSI acoustic calibrations for all your sound sensors.
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Frequency Weighting Analysis

Frequency weighted noise measurements offer convenient ways to measure sound and sound frequency range. Dewesoft uses each of these frequency weighting algorithms for different type of measurements.

A-weighting is applied to measure sound levels in an effort to account for the relative loudness perceived by the human ear. The human ear is less sensitive to low and high audio frequencies. 
B-weighting is the best weighting to use for music listening purposes.
C-weighting  is used for high-level noise measurements.
D-weighting was specifically designed for use when measuring high-level aircraft noise in accordance with the IEC 537 measurement standard. The large peak in the D-weighting curve reflects the fact that humans hear random noise differently from pure tones, an effect that is particularly pronounced around 6 kHz.
Z-weighting is linear at all frequencies and it has the same effect on all measured values.
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Time Weighting Analysis

Sound level measurement using any grade of a sound level meter can be fast, slow or impulse time-weighted. These weightings date back to the time when sound level meters had analog meters and defined the speed at which the meter moved.

Fast: the needle would move fast to show quickly varying noise. Fast corresponds to a 125 ms time constant.
​Slow: the needle would be damped to smooth the noise out to be easier to read. Slow corresponds to a 1-second time constant.
Impulse: the impulse time weighting is about four times faster than fast, with a short rising time constant but a slow failing constant. Impulse has a rise time constant of 35 ms and fall time constant of 1.5 sec.
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Calculated Sound Parameters

Dewesoft sound level meter calculates several parameters and channels in real-time during the measurement. Some of the automatic calculations are:

​Frequency weighting / Time weighting / Lpk weighting / Frequency weighting raw / Classified sound levels / Lp (SPL) / Lim / LE
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True Peak Level

The true peak level shows the real peak value of the input signal in dB (decibel). The sound pressure level (SPL) always contains a time weighting filter, which has an influence on the peak value.

The sound pressure level does not reach that high values, no matter of we select F, S or I time weighting. The LCpk, however shows the "true peak".
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  • Home
  • Products
    • DEWESoft Test & Measurement Instruments & Software
    • DEWESoft Vibration Shakers
    • CAE Acoustic & Vibration
    • PCB Sensors & Instrumentation
    • Endevco Sensors for Challenging Test & Measurement Applications
    • IMI Industrial Vibration Sensors, Switches & Instrumentation
    • Larson Davis Noise & Vibration Measurement
    • OMS Laser Vibrometer & Scanner
    • TE Connectivity Sensor Solutions
  • APPLICATIONS
    • DEWESOFT >
      • Acoustics >
        • Sound Level Meter
        • Octave Band Analysis
        • Sound Intensity
        • Sound Power
        • Reverberation Time RT60
      • Structural Dynamics >
        • FFT Analyzer
        • Fatigue Testing
        • Modal Testing
        • Shock Response Spectrum
        • Sine Reduction Test (COLA)
        • Bridge Monitoring
      • Monitoring >
        • Condition Monitoring
        • Condition Monitoring Software
      • Vibration Analysis >
        • FFT Analyzer
        • Human Body Vibration
        • Octave Analysis
        • Order Tracking Analysis
      • Vehicle Testing >
        • ADAS >
          • Collision Avoidance Testing
          • Blind Spot Detection Testing
          • Lane Departure Warning & Lane Assist System Testing
          • Adaptive Cruise Control Testing
          • Autonomous Vehicles Testing
        • Brake Testing >
          • Flexible Brake Testing System
          • Brake Testing Calculations
          • Automated Testing Workflow
          • Brake Test System Configuration Examples
          • Supported Automated Brake Testing Standards
          • Free Online Brake Test Training & Resources
        • Brake Noise Testing >
          • Brake Noise Detection
          • Brake Noise Input Channel Configuration
          • Brake Noise Analysis Results
        • Combustion Analysis >
          • In-car and Testbed Data Acquisition System
          • Internal Combustion Engine R & D
          • Simple & Intuitive Configuration
          • Heat Release Calculation
          • IC Engine Knocking Detection
          • Combustion Noise Measurement & Analysis
          • Additional Math Calculations & Statistics
          • Combustion Analysis Features
          • Raw Data Storage, Post Processing & Reporting Capabilities
          • Free Online Training Course
        • E-Mobility >
          • Electric Vehicle Testing
          • Hybrid Vehicle Testing
          • Hydrogen Vehicle Testing
          • Battery Testing
          • EV Charging Analysis
          • Testbed & On-road Testing
          • Synchronized Measurement of Several Vehicle Parameters
          • Exemplary E-Mobility
          • Analyzing Different Driving Situations
          • Charging Profile, Time & Efficiency
          • EMC Test
        • Harsh Environment Testing >
          • Vehicle Environmental Tests
          • Distributed Data Acquisition
          • Heating & Air Condition Testing
          • Climate Comfort Testing
        • Pass-by Noise >
          • Pass-by Noise Test Overview
          • Pass-by Noise Test
          • Pass-by Noise Emission Standards
          • Pass-by Noise Data Acquisition System
          • Real-time Pass-by Noise Results
        • Roadl Load Data / Durability >
          • Durability Testing Overview
          • Compact All-in-one DAQ System
          • Powerful DAQ Software
          • Digital Interface to 3rd Party Durability Test Benches
        • Vehicle Dynamics >
          • Vehicle Dynamics Test Suite
          • Vehicle Dynamics DAQ System Overview
          • Standard Vehicle Test Maneuvers
          • Data Processing
          • Vehicle Test Suite Applications
          • Easy Controls for Test Driver
      • Power & Energy >
        • Power Analyzer >
          • Motor & Inverter
          • Power Transformer
          • Standby Power
          • Electrical Equipment
        • Power Quality Analyzer >
          • Railway
          • Renewable Energy
          • Wind Power
    • CAE ACOUSTIC & VIBRATION >
      • First Handheld Sound Camera
      • Simplest Way to Image Sound Sources
      • Room / Building Acoustic
      • Compressed Air Leak Detection
      • SoundCam in Automotive Industry
      • Noise at Construction Site
      • Acoustic Applications
    • PCB PIEZOTRONICS >
      • General Test Labs & Universities
      • Aerospace & Defense
      • Automotive
    • ENDEVCO SENSORS >
      • Aerospace
      • Auto Safety
      • Automotive
      • Infrastructure
      • Laboratory
      • Transportation
      • Weapons
    • IMI INDUSTRIAL SENSORS >
      • Energy
      • PDM & Process Monitoring
    • LARSON DAVIS NOISE & VIBRATION >
      • Noise Monitoring & Industrial Hygiene
    • OMS LASERPOINT & SCANNER >
      • Aerospace
      • Audio & Musical Instruments
      • Automotive
      • Electronics
      • Medical
      • Military
      • Structural Integrity
  • CALIBRATION
    • Calibration Service >
      • DEWESoft
      • PCB Sensors & Instrumentation
  • DOWNLOAD
    • DEWESoft
    • CAE Acoustic & Vibration
    • PCB Piezotronics
    • ENDEVCO Sensors
    • IMI Industrial Sensors
    • Larson Davis Noise & Industrial Hygiene Solutions
    • OMS Laser Vibrometer
    • Calibration Instruments
  • VIDEOS INFORMATION
    • DEWESoft
    • CAE Acoustic & Vibration
    • PCB Piezotronics
    • Larson Davis Noise & Vibration
  • Contact
  • Coffee Time
    • Festival of Lights SIN
    • Fireworks >
      • 2020 (1)
      • 2020 (2)
      • 2020 (3)
    • Raffles Marina SIN
    • Singapore Bird Park
    • Singapore Wildlife
    • Sungei Buloh Wetland Reserve
    • Woodlands Waterfront SIN