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Home ... Engineering Information... Miniature & Small ball bearings... Selecting a Bearing... 16. Noise

Miniature & Small ball bearings -16. Noise

Noise level is checked by Anderon meter. The Anderon meter is explained below.


Anderon meter

It is impossible to see the bearings inside once they are assembled. The noise levels of bearings must be checked when they are rotating. An Anderon meter is used to check the noise of complete bearings. It tells the noise level of each bearing with a certain unit. When noise is checked by the Anderon machine, a specified preload is applied to each different bearing. Mechanical vibration of the bearing outer ring is detected in the radial direction by contacting the outer ring with a velocity pickup, and the signal from the pickup is converted to a variable electrical output. The bearing inner ring is rotated at 1800RPM, and the outer ring is stationary during the measurement. It is possible to detect even small vibrations because a direct detection system is used instead of a system that converts from rotational vibration to air vibration. Vibration from other sources can be eliminated in this method.


The detected vibration is classified into three different frequency bands. The Anderon machine uses the unit called "Anderon". The sound quality of the detected frequency for the entire band range can be also checked with the equipped headphone speaker.

Range frequency range (Hz)
L : Low Band 50 ~ 300
M : Medium Band 300 ~ 1800
H : High Band 1800 ~ 10000

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Home ... Engineering Information... Miniature & Small ball bearings... Selecting a Bearing... 16. Noise