Regarding noise performance, NMB 100% inspects for bearing noise in the dynamic condition with an Anderon meter.

The Anderon meter inspects for vibration noise of a complete ball bearing. The system picks up noise and very faint vibrations of a ball bearing directly, not through the air. Thus, it is not necessary to consider the effect of airborne noise and vibration.

When the inner ring of ball bearing rotates at 1,800 min^-1, vibration occurs to the outer ring. The velocity-type pickup is set up to contact the outside diameter of the outer ring and it transforms the value from mechanical vibration in the radial direction to an electric value.

The vibration noise value is shown on the meter after all frequencies are separated into three bands. The Anderon meter has an amplifier and speaker to cover all frequencies besides the shown values. One is also able to listen the sound level acoustically with headphones.

The three frequency bands are separated as follows: