Manfred Weber
Metra Mess- und Frequenztechnik in Radebeul e.K.
Since 1954

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PC Vibration Measuring System VibroMetra


FFT Analyzer Software Modules

Frequency Analyzer VM-FFT
  • Vibration analyzer for low and middle frequencies
  • Calculates the spectrum of vibration acceleration
  • VM-FFT+ also for velocity and displacement
  • RMS and peak spectrum
  • Envelope spectrum for roller bearing analysis with VM-FFT+
  • Limit curve with external alarms in VM-FFT+
  • Power spectral density (PSD) with VM-FFT+
  • Two measuring cursors for magnitudes and frequencies with snap-in function
  • Up to four signals per window
  • One VM-FFT license can be operated simultaneously up to four times with different settings
  • VM-SCOPE may trigger the frequency analyzer module VM-FFT
  • External messengers
  • Offline measurement

Notice: VM-FFT SE as part of the combined licenses VM-SE FMS and VM-SE FMP does not have triggers, amplitude list, reports and annunciators.

Required hardware components IEPE / USB interface M302 or M312, IEPE accelerometer
X axis frequency / rotary speed
Y axis RMS / peak / phase
Frequency range 0.3 to 2000 Hz with M302; 0.1 to 40 000 Hz with M312
Frequency resolution 0.01 Hz
Number of lines max. 524.288
Window functions Square, Bartlett, Blackman, Hamming, Hann, Flattop
Detailed description (online help)
Data sheet(400 kB)
Quick start guide (600 kB)
The latest version of VibroMetra software can be found on our download page.
VibroMetra can be started in the Simulator mode for testing.
.. add to memo list

Application Example:

Vibration Testing at Motors, Gear Boxes etc. in Production Plants with KST94 and VM-FFT+

Anwendungsbeispiel

  • The KST94 with its movable tip can be automatically pressed against the test object by pneumatic force.
  • By its internal vibration isolation the KST94 can measure precisely even in noisy environments.
  • An M302 USB sensor interface samples the data.
  • By the software VM-FFT+ the measuring signal is displayed in frequency domain. Measurement can be triggered via a digital input.
  • An arbitrary limit curve allows frequency-selective alarms which can be transmitted, for example, by the industrial switch modules of ADAM series.

Run-Up / Coast-Down (Tracking) Analyzer VM-TRACK
  • Displays vibration level and phase angle at multiples of the rotary frequency
  • Quick and simple detection of resonances
  • Measures acceleration
  • Version VM-TRACK+ also for velocity and displacement
  • Two measuring cursors for magnitudes and frequencies with snap-in function
  • Clone function can be used to analyze at several multiples of the rotation speed simultaneously
  • Up to four signals per window
  • External messengers
  • Offline measurement

Note: VM-TRACK needs for operation the RPM sensor VM-PS.

Required hardware components IEPE / USB interface M302 or M312, IEPE accelerometer
Frequency resolution 0.1 Hz
Rotary speed multiples 0.5 and 1 to 12
Detailed description (online help)
Data sheet(400 kB)
Quick start guide (600 kB)
The latest version of VibroMetra software can be found on our download page.
VibroMetra can be started in the Simulator mode for testing.
The latest version of VibroMetra software can be found on our download page.
VibroMetra can be started in the Simulator mode for testing.
.. add to memo list

Waterfall Analyzer NEW VM-FFT 3D
  • Versatile tool for run-up and coast-down analysis, detection of resonances
  • View of several spectra over time (waterfall / 3D)
  • Diagram can be rotated, shifted and zoomed in various ways
  • Time-frequency display (3D) it can be switched to a 2D display
  • Acceleration spectrum
  • VM-FFT 3D+ additionally calculates velocity and displacement spectrum
  • VM-FFT 3D+ performs in addition envelope analysis, roller bearing analysis and acoustic measurements with frequency weightings
  • Two measuring cursors for magnitudes and frequencies with snap-in function
  • Up to four signals per window
  • External messengers with amplitude limit curves
  • Offline measurement

Required hardware components IEPE / USB interface M302 or M312, IEPE accelerometer
X axis frequency, rotation speed, time
Y axis peak, RMS, phase (2D)
Frequency range 0.3 to 2000 Hz with M302; 0.1 to 40 000 Hz with M312
Frequency resolution up to 0.01 Hz
Number of lines up to 524288
Number of FFTs in 3D view 4 to 1000
Generation of time data continuous / triggered
Window functions Square, Bartlett, Blackman, Hamming, Hann, Flattop
Overlapping 0 to 99 %
Limit curve graphically, free adjustable, up to 100 points
Markers (roller bearing, only VM-FFT 3D+) Inner race, outer race, cage, ball, WK ring contact, side bands, harmonics (integrated database of > 20000 bearings
Detailed description (online help)
Data sheet (400 kB)
Quick start guide (600 kB)
The latest version of VibroMetra software can be found on our download page.
VibroMetra can be started in the Simulator mode for testing.
.. add to memo list

Octave / Third-Octave Band Analyzer NEW VM-OCT+
  • Vibration monitoring of very sensitive equipment, like electron microscopes, photolithography in microelectronics and nanotechnology
  • Evaluation of vibrations with regard to "VC" and "Nano" criteria
  • Sound pressure level analysis with acoustic weightings
  • Long-term monitoring with alert function
  • Two measuring cursors for magnitudes and frequencies
  • Up to four traces per window
  • Report function
  • External messengers
  • Offline measurement

Required hardware components IEPE / USB interface M312 or M302 (2 kHz bandwidth, not for acoustics), IEPE accelerometers, IEPE microphones
Functions Octave, third-octave and 1/6 octave band analyzer
Calculations RMS, peak (rectangular / exponential window), interval peak, sound pressure level (A / C weighted, fast / slow), equiv. contin. sound level, daily noise exposure, unweighted sound pressure level
Operation modes VC criteria, Nano criteria, acoustics
Frequency ranges 1 to 100 Hz (VC / Nano); 20 to 20 000 Hz (acoustics)
Detailed description (online help)
Data sheet
Quick start guide (600 kB)
The latest version of VibroMetra software can be found on our download page.
VibroMetra can be started in the Simulator mode for testing.
.. add to memo list