Fast Fourier Transform (FFT)

The Fast Fourier Transform (FFT) Converts Dynamic Signals from the Time Domain to the Frequency Domain, Enabling Engineers and Technicians to Analyze and Understand Signal Frequency Content

Used extensively in industries such as aerospace, automotive, defense, power and process, and manufacturing, the FFT serves as a primary tool for applications where vibration and other dynamic measurements are made including acceptance testing, vibration surveys, model validation, and troubleshooting and diagnostics.​

Providing a valuable set of fundamental measurement capabilities, the FFT Dynamic Signal Analysis package with 900 Series hardware delivers a powerful range of functions for fast, accurate, and easy-to-use time and frequency domain measurements.

Versatile Measurements

Time Domain Acquisition

Waveform capture and storage for each measurement

Transfer Function, Coherence, and Export to ME’scope

Complete solution for modal analysis application

Synchronous Average

Isolation of synchronous content such as with rotating machinery

Synthesized Octave Analysis

Octave bands with A,L weighting


Quantified similarity of two signals

Linear Spectrum, Auto Power Spectrum, and Power Spectral Density (PSD)

Live and averaged spectral measurements in different formats

Signal Processing Tools and Settings

Rectangular, Hanning, and Flat Top Windows

Minimized spectral leakage as needed for the application

Output (DAC) Waveforms

Sine, Random, Burst Random, Swept Sine, Chirp, Pink Noise, and Thump

Zoom Analysis

Resolution of closely spaced frequency components

User Signals

Comparative visual reference or limit lines


Input, output (DAC), and tach triggers for versatile data capture

Data Saves and Exports

Customize data saves and exports to be based on time, frames, averages, or more

Advanced Hardware and Network Connectivity

Form Factor

Rugged, lightweight, and portable for field applications

Standalone Operation

Data capture, processing, and storage without a PC

Sampling Rates

Up to 216 kSamples/sec

Frequency Resolution

Up to 51,200 lines of resolution for Isolation of closely spaced frequency content values

High Dynamic Range

Up to 140 dB for effective measurement of low amplitude signals

Time/Phase Synchronized Data Acquisition

All acquired data synchronized to within 0.5deg @ 40kHz even across multiple chassis with thousands of channels

Real Time Data Processing

Data sampled, re-sampled, processed, and stored live during acquisition with or without PC

900 Series Dynamic Range Plot
Click to enlarge

Custom Reports and Data Review/Export

Fully Customizable Plots

Include readouts including test parameters, customer and test article name, operator, test time, etc

Overlay Data

Data from one or more runs/saves can be overlaid in Review Mode within seconds.  The overlaid plots can be placed in a report.

Data Export

Data can be exported automatically during or after a test

Create Custom Report Templates in Word

Create a report template in Microsoft Word and have SignalCalc 900 populate the report parameters, plots, and images automatically after each test (DP900-68)

Images and Media

Attach images of the test article or setup and have them printed in the report

Generate Reports Anywhere

Generate Reports on the PC that conducted the test, or on any networked PC

Efficient Testing, Analysis, and Reporting

1 Channel Indicators

Easily monitor signal strength across all channels; green indicates good, yellow indicates low, and red indicates overload.

2 Compatible Export Option

Export data to Excel/ASCII, Matlab, UFF, ME’scope.

3 Review and Overlay Signal

Compare and contrast signals from different Tests/Runs/Saves; construct waterfall plots from individual saves in Review Mode.

4 Integration and Differentiation

Compute velocity or displacement from acceleration, and vice-versa; optional HighPass Filter before Integration is available.

5 Channel Incrementor

Conveniently increment current graph or all graphs to the next set of channels.

6 RMS and Peak Value Displays

Annotate graphs with important data values; copy all data on the graph or just Peak values to paste into Excel.