Section 3 — Sensors
36
Set up Accelerometer
To set up your accelerometer:
1. Plug the accelerometer connector into the BNC sensor input of your
instrument.
2. Screw the accelerometer into the magnetic base.
3. Attach the accelerometer to the measurement point using these
guidelines:
• Attach the accelerometer to a sturdy, rigidly mounted, non-
flexible structure, where vibration from the rotating part of the
machine will be accurately transmitted.
• Do NOT attach sensors to sheet metal, guards, or any machine
structure that is NOT closely coupled to the source of vibration
in the spinning rotor. The vibration of this kind of structure will
be different to the vibration source.
• The attachment structure must be at least 10 times heavier
than the accelerometer itself. Do NOT mount the accelerometer
on lightweight motors or similar parts as the weight of the
accelerometer will distort the vibration signal. Use a smaller
accelerometer for small structures.
• To avoid distorted signals, attach the accelerometer as closely
as possible to, and in line with, the centerline of the bearings.
• The mounting surface should be flat and smooth where the
accelerometer makes contact. Attach the accelerometer using
the magnetic accelerometer base supplied or a threaded stud
on the machine surface. The accelerometer should NOT move
independently of the machine part it is attached to.
• Ensure the accelerometer is oriented correctly. Vibration can
vary significantly with direction.
• If you are undertaking an ongoing study of a particular
measurement point, always attach the accelerometer at exactly
the same position you used for previous measurements
TIP: Mark the position if necessary.
• Keep the accelerometer clear from other cables to ensure it is
NOT twisted, kinked, or tangled.
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