Roller bearing faults (PT 501)

assessment of bearing condition by vibration analysis



  • Vibration analysis is a key tool in estimating the condition of a roller bearing.
  • The slow change in the vibration spectrum provides indications of the remaining life of a bearing and can be used as a criterion for its replacement.
  • The spectral distribution can deliver accurate information on the type and location of the damage.
  • PT 501contains six interchangeable roller bearings on which different faults can be detected and explained.
  • The radial load on the bearing is set within broad limits using the loading device.
  • An electric motor with variable speed via frequency converter is used as drive.
  • An acceleration sensor with measuring amplifier serves to measure the vibrations at the bearing housing.
  • The speed is measured with an optical sensor.
  • The measured values are transmitted directly to a PC via USB.
  • The software for vibration analysis is included.
  • The analysis software offers the following features: two-channel oscilloscope for investigations in the time range; two-channel spectrum analyser for investigations in the frequency range; vibration measuring unit; envelope analysis for bump effects and roller bearing damage.

Technical Details:


  • investigation of the vibrations of roller bearings
  • roller bearing with damage to outer race
  • roller bearing with damage to inner race
  • roller bearing with damage to a roller body
  • roller bearings with combined damage
  • long-running roller bearings
  • new and undamaged roller bearing
  • drive motor with variable speed via frequency converter
  • radial loading of bearings via adjustable loading device
  • vibration isolation of the foundation plate using rubber elements
  • instruments: optical speed sensor, acceleration sensor to record vibration
  • software features: 2-channel oscilloscope; 2-channel FFT analyser; envelope analysis; run-up curve and order analysis
  • GUNT software for vibration analysis under Windows 7, 8.1, 10

Technical Data:

  • Pendulum ball bearing of type NU204-E-TVP2:
  • inside diameter: Ø=20mm
  • outside diameter: Ø=47mm
  • width: 14mm
  • number of rollers: 12
  • Drive motor:
  • speed: 100…3000min-1
  • power: 370W
  • Acceleration sensor:
  • frequency range: 1…10000Hz
  • sensitivity: 100mV/g
  • resonance frequency: 32kHz
  • Optical speed sensor:
  • sampling width: 3…150mm
  • laser class II, 675nm
  • 230V, 50Hz, 1 phase
  • 230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase

Dimensions & Weight:

  • L x W x H: 510x200x330mm (experimental unit)
  • L x W x H: 420x400x180mm (control unit)
  • Weight: approx. 25kg (total)

Required for Operation:

PC with Windows

Learning Objectives/Experiments:

  • vibrational spectrum of the running noise of roller bearings
  • familiarisation with the envelope analysis
  • influence of damage to outer race, inner race or roller body, on the spectrum
  • estimating service lives of roller bearings
  • influence of the lubricant on the vibration spectrum
  • detection of faulty roller bearings
  • use of a computerised vibration analyser

Scope of Delivery:

  • 1 experimental unit
  • 1 control unit
  • 6 roller bearings
  • 1 set of accessories
  • 1 GUNTsoftware + USB cable
  • 1 set of instructional material


  • comparison of bearings with different faults

Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.