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          • In-car and Testbed Data Acquisition System
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          • Powerful DAQ Software
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          • Vehicle Dynamics DAQ System Overview
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      • Simplest Way to Image Sound Sources
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      • Compressed Air Leak Detection
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  • VIBRATION TESTING & CALIBRATION SYSTEM
    • DEWESoft Vibration Shakers
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    • ECON Vibration Testing System >
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        • VT-8 Series MIMO Vibration Controller
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        • Torque Sensors
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      • IMI Industrial Sensors >
        • ICP Accelerometers
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FFT Spectrum Analyzer & Frequency Analyzer

Dewesoft FFT spectrum analyzer has it all. Top performance, advanced cursor functions, high freely selectable line resolution, flexible averaging and advanced functions for in-depth frequency analysis.
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FFT Spectrum Analyzer Overview - Performance & Flexibility

Dewesoft FFT spectrum analyzer provides all main functions for spectral analysis with advanced averaging, selectable resolution (64,000 lines and more) or direct specification of the bandwidth (e.g. 0.01 Hz). Multiple channels can be displayed and analyzed in one FFT analyzer instrument for easy comparison.

​It offers either real-time direct online frequency spectrum analysis during the measurement or offline frequency analysis on the stored data.
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Multipurpose Frequency Cursor Functions

Dewesoft FFT analyzer allows setting multiple markers for automatic detection of different parameters. Our frequency analyzer offers the following markers:

Free marker: free markers can be freely added. The marker shows us the frequency of the peak at which it stands and its amplitude.
​Maximum marker: the maximum marker finds the highest amplitude in the spectrum.
RMS marker: RMS marker will sum up all the FFT lines in the selectable band and calculates the RMS value.
Sideband marker: the sideband marker monitors the modulated frequencies to the left and right from the selected centerline.
Harmonic marker: the harmonic marker is a great help when identifying the fundamentals of the frequency.
Damping marker: damping markers are best to use in modal testing when we want to find out how our transfer curve is damped. We select it when we are interested in the quality factor, damping ration or attenuation rate of a selected peak.
Delta marker: shows the difference in channel values between two positions of the marker. 
Zoom marker: with zoom marker you can easily zoom into the selected region of a channel. 
Bearing cursor: identify the bearing frequencies (envelope detection).
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FFT Analysis Settings

Dewesoft FFT analyzer module allows several parameters to be set up before the calculation:

Output channels - complex, amplitude, overall RMS
Calculation type - block history or overall
Windowing - Rectangular, Hanning, Hamming, Flattop, Triangle, Blackman, Exponent down, Transient
​Resolution - up to 64000 lines (64k)
Amplitude type - peak, peak-peak, RMS, PSD, Power
DC cutoff - remove DC or low-frequency components
Overlap - define the percentage of time signal that has already been calculated and it is used again for calculation
Weighting - calculate the sound weighting in the frequency domain (A, B, C, D)
Averaging type - linear, exponential, peak-hold
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Bearing Fault Detection

Envelope detection is a procedure for early detecting of faults on ball bearings.

When a failure of the ball bearing occurs, it will produce ringing with a frequency which corresponds to its natural frequency. This ringing will repeat each time when a damaged part of the ball hits the ring or vice versa. We have to know also that inner ring, outer ring, cage and balls have different typical repeating frequency depending on the geometry of the bearing and the rotational frequency.
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Short-time Fourier Transform (STFT)

Short-time Fourier transform or shorter STFT is a well-known technique in signal processing to analyze non-stationary signals. STFT is segmenting the signal into narrow time intervals and takes the Fourier transform of each segment.

When the signal changes fast, you need a small time to calculate the frequency spectrum faster. But you still want better frequency resolution and here STFT comes in place (we get 16 times better frequency resolution for the same time frame).
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Full Spectrum

Used for signal modulation, signal demodulation and rotor whirl analysis.

The single value or block history / windowing / overlap and DC cutoff
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Cepstrum Analysis

The cepstrum analysis calculation (also used to determine characteristics in speech analysis) helps to identify vibration signatures, such as frequencies in the gearbox and bearing analysis. Dewesoft provides mirror spectrum, low and high frequency output. 

selectable block size / windowing / liftering / overlap and overaging

Video below shows Cepstrum math being used on a microphone input signal to determine the speaker's name.

Auto-Spectrum & Cross-Spectrum

Power spectral density (PSD) is the measure of the signal's power content versus frequency. A PSD is typically used to characterize broadband random signals. The amplitude of the PSD is normalized by the spectral resolution.
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DEWE SOLUTIONS PTE LTD. Data Acquisition Systems, Software & Sensors... Ready to measure!
Website is maintained by Louis Looi   ©  2020 Louis Some Rights Reserved
  • Home
  • Products
    • Dewesoft Test & Measurement Equipment >
      • USB & Ethercat DAQ Systems
      • Rugged Data Acquisition Systems
      • Portable Data Acquisition Systems
      • Modular Data Acquisition Systems
      • Power Analyzer
      • Data Acquisition Software
      • Sensors
    • Neo Messtechnik Power Quality Analyzer
    • CAE Acoustic & Vibration
    • PCB Test & Measurement Sensors & Instrumentation >
      • Accelerometers
      • Acoustics
      • Force Sensors
      • Impact Hammers
      • Pressure Sensors
      • Strain Sensors
      • Signal Conditioners & Amplifiers
    • IMI Sensors for Condition Monitoring >
      • Industrial Accelerometers for Machinery Health Monitoring
      • 4 - 20mA Vibration Transmitters for Process Vibration Monitoring
      • Pressure Transducers
      • Vibration Switches
    • Endevco Sensors for Challenging Test & Measurement Applications >
      • Accelerometers
      • Accelerometer Simulator
      • Pressure Transducers
      • Signal Conditioners
    • Larson Davis for Noise Monitoring Solutions >
      • Sound Level Meters
      • Environmental Noise Monitoring
      • Workplace Noise & Vibration
    • Resensys Remote Monitoring Sensors
    • OMS Non-Contact Vibration Measurement
  • 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
        • 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 >
      • Test & Measurement
      • Aerospace & Defense
      • Automotive
    • ENDEVCO SENSORS >
      • Endevco Sensors Typical Applications
    • IMI INDUSTRIAL SENSORS >
      • Energy
      • PDM & Process Monitoring
    • OMS LASERPOINT & SCANNER
  • VIBRATION TESTING & CALIBRATION SYSTEM
    • DEWESoft Vibration Shakers
    • PCB Portable Handheld Shaker
    • IMI Industrial Portable Handheld Shaker & Calibrator
    • ECON Vibration Testing System >
      • Miniature Shaker
      • Air Cooled Shaker
      • Water Cooled Shaker
      • Climate Chamber Combined Shaker
      • Hydraulic Shaker
      • Multi-Axis Shaker
      • Vibration Controller >
        • VT-6 Series Servo-vibration Controller
        • VT-8 Series MIMO Vibration Controller
        • VT-9 Series Vibration Controller
      • Power Amplifier >
        • VSA-L Series Linear PA
        • VSA-H Series Switching PA
      • Slip Table
      • Head Expander
    • Dewesoft & PCB Instrument Calibration Service >
      • DEWESoft
      • PCB Sensors & Instrumentation
  • INFORMATION
    • DOWNLOAD >
      • DEWESOFT >
        • Products Catalog
        • Applications Brochure
        • Products Brochure
      • CAE Acoustic & Vibration
      • PCB Piezotronics >
        • ENDEVCO Sensors
        • Accelerometers
        • Acoustic & Sound Measurement
        • Force, Load & Strain Sensors
        • Pressure Sensors
        • Torque Sensors
        • Electronics & Signal Conditioning
      • IMI Industrial Sensors >
        • ICP Accelerometers
        • Charge Accelerometers
        • 4-20mA Transmitters
        • Vibration Switches
        • IMI Pressure Sensors
        • Cables, Enclosures & Accessories
        • Electronics
      • Calibration Instruments
    • VIDEOS >
      • CAE Acoustic & Vibration
      • DEWESoft
      • PCB Piezotronics >
        • PCB Piezotronics Virtual Tour
    • TRAINING >
      • Getting Started with DEWESOFT
      • How to Measure Signals
      • How to Analyze Data
    • WEBINARS
  • Contact