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FFT Analyzer
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FFT Spectrum Analyzer and Frequency Analyzer

The 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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IEPE
IEPE
Charge
Charge
Voltage
Voltage
Strain and Stress
Strain and Stress
Pressure
Pressure
Counter and Encoder
Counter and Encoder
Torque
Torque
RPM
RPM
Acceleration
Acceleration
Video
Video
High-speed video
High-speed video
Thermal video
Thermal video

Highlights

  • REAL-TIME FFT SPECTRUM ANALYSIS: The Dewesoft spectrum analyzer offers real-time FFT analysis on unlimited input channels.
  • UNLIMITED INPUT CHANNELS: Our DAQ systems offer virtually unlimited input channel configurations and our DAQ software can perform FFT analysis on any or all of them at the same time.
  • AVERAGING: Overall (averaged) FFT with linear, peak and exponential averaging or block-based calculation is available.
  • ANY LINE RESOLUTION: Selectable line resolution up to 64.000 lines for most demanding tasks.
  • CURSORS AND MARKERS: The FFT visual control can display values of the currently selected point with the markers. Available markers are a maximum marker, free marker, zoom marker, sideband marker, harmonic marker, RMS marker, delta marker and more.
  • CURSOR VALUE ESTIMATE: Innovative window interpolation technique allows precise amplitude and frequency estimation.
  • ADVANCED MATH: Auto spectrum, cross-spectrum, complex spectrum, waterfall spectrum, cepstrum (for bearing faults, speech processing), two-sided full FFT (for rotor whirl analysis), STFT (for non-stationary signals), envelope detection (for bearing fault analysis).
  • LIFETIME FREE SOFTWARE UPGRADES AND SUPPORT: Our data acquisition systems come bundled with award-winning Dewesoft X data acquisition software. The software package is always evolving and new features are being added. We offer lifetime FREE software upgrades and technical support to all our users.
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FFT Spectrum Analyzer Overview - Performance and 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. 

Check the video on the left to get a brief overview and see why our spectrum analyzer is the best performing and most flexible spectrum analyzer in the world. 

FFT Spectrum Analyzer Overview - Performance and Flexibility

Multipurpose Frequency Cursor Functions

The 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 selected 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)

 

Multipurpose Frequency Cursor Functions

FFT Analysis Settings

The DewesoftX 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 64.000 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
FFT Analysis Settings

Bearing Fault Detection

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

When a failure of the ball bearing occurs, it will produce ringing with a frequency that 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 the inner ring, outer ring, cage, and balls have different typical repeating frequencies depending on the geometry of the bearing and the rotational frequency.

Bearing Fault Detection

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.).

 

Short-time Fourier Transform (STFT)

Full Spectrum

Full Spectrum transform (two-sided Fourier) changes complex input signal from time to complex frequency domain. The input signal should be in the form of complex synchronous data (re, im). Real and imaginary parts are usually gathered from two proximity probes installed in the X and Y direction. Traditional spectrum provides no information regarding the direction of motion of individual frequency components on rotating shafts and here is where full spectrum steps in.

Full-spectrum is used for signal modulation, signal demodulation, and rotor whirl analysis. 

  • the single value or block history
  • windowing
  • overlap and DC cutoff
Full Spectrum

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 averaging


​​​​​​​The video on the right side shows Cepstrum math being used on a microphone input signal to determine the speaker's name.

Cepstrum Analysis

Auto-spectrum and 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.

Auto-spectrum and Cross-spectrum

Applies to Products

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SIRIUS

The world's most versatile, powerful, high-dynamic USB and EtherCAT data acquisition system. Connect any signal and sensor. Packed with the latest DAQ technology. Free DAQ software included.

View product SIRIUS mini

SIRIUS mini

Small and highly portable, USB powered 4-channel data acquisition system. SIRIUS mini offers a 160 dB dynamic range and is ideal for vibration analysis and acoustic noise measurements.

View product SIRIUS XHS

SIRIUS XHS

SIRIUS XHS is a high-speed data acquisition system (15 MS/s) with the new Hybrid ADC technology capable of high-bandwidth transient recording and very high-dynamic, alias-free data acquisition. 

Modern data interfaces such as USB 3.0, GLAN, XCP, CAN, and OPC UA, with PTP synchronization allow for open and flexible connectivity.

View product KRYPTON

KRYPTON

Rugged and distributed EtherCAT data acquisition system for field measurement in extreme and harsh environments. KRYPTON DAQ systems offer IP67 degree of protection and can operate in the extreme temperature range from -40 to +85°C and offer high shock protection.

View product IOLITE

IOLITE

Standalone, distributed, and cost-effective data acquisition device with high-end signal conditioning for monitoring and industrial applications. Free software included.

View product IOLITE Rack

IOLITE Rack

Data acquisition and real-time control front-end system with dual EtherCAT buses for industrial testing applications. All-in-one solution for real-time control and feedback monitoring. Watch the IOLITE presentation video.

View product DEWE-43A

DEWE-43A

Award-winning and versatile 8-channel USB data acquisition system with unmatched price/performance ratio and hand-size footprint. 8 universal analog inputs, 8 digital/counter/encoder inputs, and two high-speed CAN bus inputs. 

View product MINITAURs

MINITAURs

Versatile 8-channel data acquisition system and data logger with cutting edge signal conditioning at an attractive price with analog, counter, and CAN inputs.

View product DewesoftX

DewesoftX

DewesoftX is an award-winning data acquisition software for test & measurement and monitoring. Experience data recording, signal processing, and data visualization like never before.

DewesoftX DAQ software received multiple international awards, is innovative and easy-to-use, but at the same time very deep in functionality. Our mission is clear - one software for all test and measurement applications.

View product Order Tracking

Order Tracking

Order analysis is a technique for analyzing noise and vibration signals in rotating or reciprocating machinery such as engines, compressors, turbines, and pumps.

Dewesoft provides flexible order analysis software and data acquisition hardware for analyzing any rotating machinery. 

The solution is extremely powerful in combination with other modules like torsional vibration analysis, combustion analysis, or power analysis. It can provide complete diagnostics of generators, combustion engines, and rotating shafts.

View product Torsional Vibration

Torsional Vibration

Torsional vibrations are quite often a source of issues and faults on the rotating shafts. Our rotational and torsional vibration analysis module combined with the order tracking analysis module is a perfect tool for troubleshooting shafts, crankshafts, gears in automotive, industrial or power-generation applications. 

View product Sine Reduction Test

Sine Reduction Test

Integrate and synchronize the data acquisition system seamlessly with your vibration shaker COLA signal and perform a powerful evaluation of structural properties on unlimited channels in real-time. The Dewesoft sine processing solution is easy to set up and will get you measuring right away.

Dewesoft since processing solution offers a simple setup and real-time calculation of any channel count desirable. All measured and calculation results are visible in real-time. Free award-winning data acquisition software included with lifetime updates.

View product Modal Analysis

Modal Analysis

SIMO, MIMO, ODS, and Experimental modal testing and modal analysis solution. The modal test is an indispensable tool to determine natural frequencies and mode shapes of any structure. With our solution, you are able to excite the structure with an impact hammer or modal vibration shakers and easily measure the responses. Import or draw your geometry for rich visualization and animation of your structures.

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