Technical data are subject to change without notice.
© Copyright SPM 2002-04. 71650.B
SPM Instrument AB • Box 504 • S-645 25 Strängnäs • Sweden
Tel +46 152 225 00 • Fax +46 152 15075 • info@spminstrument.se • www.spminstrument.se
Verify the reading
Before taking the first reading, you have to check the measuring point and the installation of the
adapter or transducer, if any. Make sure that the seat surface of the installed adapter or transducer
has firm contact with the material of the bearing housing.
The contact surface of adapters must be clean and smooth. The transducer with quick connector
must be firmly attached to the adapter. If the probe is used, it must be pointed straight at the
bearing and held steady during measurement.
Do not rely on initial or abnormal readings without making sure that they are correct:
• Check rpm, shaft diameter, dBi setting.
• If the peak indicator blinks, continue to measure until you have established the correct dBm.
Check:
- Shaft diameter and rpm, dBi setting
- Measuring point in the load zone
- Probe pointed straight at the
bearing
- Adapter (transducer) properly
mounted
- Adapter surface clean, undamaged
- Quick connect transducer firmly
attached
32 Evaluation of SPM measurements
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