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Bruel Kjaer 4809 Vibration ExciterShaker
This unit ships fully tested and is guaranteed to work. This unit has a modification which I believe is just the mounting arms on the sides.
The Units Serial Number Tag Reads:
Serial Number: 1434836
The Modification Tag Reads:
Modification: WH 2327
Applications:
Calibration of accelerometers
Vibration testing of small objects
Mechanical impedance and mobility measurements
Features:
Force rating 45 N (10 lbf) sine peak, 60 N with air cooling
Frequency Range of 10 Hz to 20 kHz
First axial resonance 20 kHz
Maximum bare table acceleration is 736 ms2 (75 g), 981 ms2 with air cooling
Low cross motion and low distortion
Description:
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 inp ut current up to a maximum 5 A and a sufficient voltage rating, without assisted cooling. The BrelKjr 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.
Specifications:
Rated Force: 44.5 N (10 lbf) sine peak, 60 N (13.5 lbf) with forced air cooling
Frequency Range: 10 Hz to 20 kHz bare table
Axial Resonance Frequency: 20 kHz bare table
Maximum Bare Table Acceleration: 836 ms2 (75 g), 1000 ms2 (100 g) with air cooling
Maximum Displacement: 8 mm (0.315 in) peak-to-peak
Maximum Velocity: 1.65 ms (65 ins) peak
Dynamic W eight of Moving Element: 60 g (0.132 lb)
Dynamic Flexure Stiffness: 12 Nmm (69 lb.in)
Maximum Input Current: 5 A RMS, 7 A RMS with forced air cooling
Current-to-Force Ratio: 0.16 AN (peak-peak), 6.4 NA (peak-peak)
Coil Impedance: 2 approx. at 500 Hz (bare table0
Stray Magnetic Field: 20 x 10-3 T at table face, 8 x 10-3 T at 12.7 mm (0.5 in) above table face
Table Size: 29 mm (1.14 in) diameter
Fastening Thread: 5 x 516 - 18 UNC for M5 and 10-32 UNF inserts
Total Weight: 8.3 kg (18.3 lb)
Dimensions: 149 mm Dia x 143 mm H (5.87 in x 5.