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  1. DMPPA

    Total Harmonic Distortion of vibration shaker system

    Hello There, I have question regarding our electrodynamic vibration shaker system. Recently we have noticed some abnormal sound (like turning fork) from the system when it is used with head expander. It occurs at the frequencies,300 Hz, 600Hz, 900Hz, 1200 Hz, 1500Hz, 1800 Hz and so on. This...

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