Bruel & Kjaer 4290 Calibration Exciter

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The Bruel & Kjaer 4290 Calibration Exciter is electrodynamic and designed to vibrate accelerometers or small components at variable frequency in the range of 200 Hz to 50 kHz. This range, with reliable acceleration control up to 30 kHz, makes the Bruel & Kjaer 4290 a useful reference device in high-frequency vibration work. The exciter consists of two separate parts, a cylindrical permanent magnet and a small compact moving element with built-in control accelerometer.

With the Bruel & Kjaer 4290 Calibration Exciter, suitable suspension is obtained by simply inserting a disc of foam nylon between the moving element and the magnet core. This type of floating suspension has no transverse resonance in the frequency range of the calibration exciter. The suspensions resonance occurs at 30 to 100 Hz. When the moving element is placed onto the core of the permanent magnet, the drive coil is situated in the radial magnetic field produced by the magnet.