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Refurbished Bruel and Kjaer 4809


Bruel and Kjaer 4809

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Refurbished
B&K Vibration Exciter Type 4809 is a small versatile instrument with an impressive performance. High quality materials ensure long term constructional reliability, and strict quality control results in consistent high performance.

Type 4809 can be driven by any small power amplifier, with an input current up to a maximum 5 A and a sufficient voltage rating, without assisted cooling. The Brüel & Kjær Power Amplifier Type 2718, rated at 75 VA, has been designed specifically to drive Type 4809.

A threaded insert is set into the table surface for attachment purposes. The insert is replaceable and acts as a mechanical fuse, protecting the moving element against damage. For most types of abusive treatment the inner threads fail before the moving element is damaged. A continuous 8mm (0.315 in) peak-to-peak displacement is possible. If the exciter should be over-driven, over-travel stops will prevent excessive displacements.

Features:
  • Powered by Power Amplifier Type 2718
  • Force rating 45 N (10 lbf) sine peak, 60 N with air cooling
  • Frequency range 10 Hz to 20 kHz
  • First axial resonance 20 kHz
  • Maximum bare table acceleration 736ms–2 (75 g), 981 ms–2 with air cooling
  • Robust rectlinear guidance system
  • Low cross motion and low distortion

    • Uses:
  • Calibration of accelerometers
  • Vibration testing of small objects
  • Educational demonstrations
  • Mechanical impedance and mobility measurements
    		•

    Bruel and Kjaer 4809 datasheet & specifications

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