《Brüel amp; Kjaer - Measuring Vibration》.pdf

Introduction This booklet answers some of the basic questions asked by the newcomer to vibration measurement. It gives a brief explanation to the following: See Page See Page Why do we measure vibration? 2 3 Environmental Influences — Cable Noise 19 Where does it come from? 3 Other Environmental Influences 20 21 What is vibration? 4 Accelerometer calibration 22 How to quantify the vibration level 5 A simple calibrator 23 The vibration parameters, Acceleration, Force and impedance measurements 24 Velocity and Displacement 6 Logarithmic scales and decibels 25 Measurement Units 6 Why use an accelerometer preamplifier? 26 Which parameter to measure 7 The vibration meter 27 The piezoelectric accelerometer 8 What is frequency analysis? 28 Practical accelerometer designs 9 Constant bandwidth or constant percentage Accelerometer types 10 bandwidth frequency analysis 29