Shock Pulse Monitoring
SPM is an abbreviation for the Shock Pulse Method, which is a patented technique for using signals from rotating rolling bearings as the basis for efficient condition monitoring of machines. From the innovation of the method in 1969 it has now been further developed and broadened and is now a worldwide accepted philosophy for condition monitoring of rolling bearings and machine maintenance.
A refined version of the classical True SPM®-method, using digital signal processing and advanced algorithms to ensure highest possible quality on measuring results, even on low RPM machines (as low as 5 RPM!)
The signal from a shock pulse transducer consists of a train of electric pulses of various magnitudes. The signal is measured over a period of time, in this case two seconds.
The SPM transducer is sensitive to the shocks generated by every operating rolling bearing. Its output is is continuous string of stronger and weaker electric pulses, analogue to the magnitude of the shocks. These are measured on a decibel scale graded in dBsv (decibel Shock Value). The logarithmic scale is used to cope with the large dynamic range: shock magnitude increases a thousand times between 0 and 60 dBsv.