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Screw Mounting Accelerometers measure shock and vibration by providing an output signal proportional to the object to which they are attached. The stiffer the mounting, the higher the natural frequency of the mounted accelerometer, will be. Magnetic mounting of accelerometers provides the least stiffness, while screw or stud mounting provides the greatest stiffness. Where possible and practical, screw or stud mounting is preferred because this method provides the stiffest connection with the object under test. Accelerometers manufactured with holes or flanges for screw/stud mounting provide end users with the most effective way of attaching these sensors to obtain best quality of data possible. However, even the most experienced users end up with bad data because they forget or ignore basic mounting guidelines. The mounting hole must be checked to ensure it is longer than the mounting screw so as to prevent "bottoming out". The mounting stud going into the base, must be the correct one for the type of accelerometer and must not “bottom out” as this will also cause problems. Use a torque wrench for tightening screws to the manufacturer’s specifications. Do not use electric tools as their frequencies may damage the accelerometer. Spread mating surface with a light coating of silicone grease, heavy machine oil or bees wax to ensure contact is secure thereby maximising the usable frequency range. Secure the cable using clamps, o-rings, tape or other materials that are most suitable to the application. Ensure that you have sufficient slack to allow for free movement of the sensor. Inspect mounting holes and remove any debris, burrs or other foreign materials. For more information, please contact Phil Clark.
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