Brüel & Kjær Sound & Vibration Measurement A/S

- Model Type 4808 - Permanent Magnetic Vibration Exciter



This high-quality compact machine with a permanent magnetic field is designed for long, trouble-free operation with relatively heavy loads to be excited to high g levels. Type 4808 will normally be driven by Power Amplifier Type 2719 rated at 180VA, but can also be driven by any amplifier up to a maximum input current of 15A RMS without assisted cooling.

  • Calibration of accelerometers
  • Vibration testing of small objects
  • Educational demonstrations
  • Mechanical impedance measurements
  • Structural response testing

  • Force rating 112 N (25 lbf) sine peak (187 N (42 lbf) with cooling)
  • Frequency range 5 Hz to 10 kHz
  • First axial resonance 10 kHz
  • Maximum bare table acceleration 700 m/s2 (71 g)
  • Low cross motion and low distortion
  • Highly damped axial, transverse and flexural resonances
  • Continuous 12.7 mm (0.5 in) peak-to-peak displacement with overtravel stops

  • Force Rating: 112 N
  • Frequency Range: 5 Hz to 10 kHz

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