Bearing Vibration / Noise Tester

Selection criteria

Frequency bands, spindle accuracy, background noise.

Supply chain

Bearing vibration testers are standard instruments made largely by Chinese instrument makers to GB/T and ISO methods. Motor makers can use one for incoming inspection when noise is critical.

Buyer FAQ

What do bearing Z and V vibration grades mean?

In Chinese standards, Z grades (Z1–Z4) are based on vibration acceleration and V grades (V1–V4) on vibration velocity; a higher number means a quieter bearing. Velocity is measured in three bands, typically 50–300 Hz, 300–1800 Hz and 1800–10 000 Hz, following the ISO 15242 method. Motor buyers usually specify Z2/V2 for general use and Z3/V3 or better for low-noise motors.

Which tester specifications matter most?

The test spindle must run very true, typically within 1 µm, at the standard speed of 1800 r/min with a controlled axial load. Background noise should be at least about 10 dB below the strictest grade you intend to measure. Check the instrument regularly against reference bearings with known values.

How should a motor maker use a vibration tester for incoming inspection?

Sample each lot by AQL, test bearings as delivered with grease and at room temperature, and measure from both sides. Keep the test station away from presses and other vibration sources. Correlating bearing results with end-of-line motor noise tells you which grade you really need.

Where it is used