Low speed solution

In conjunction with the company's 40th anniversary, SPM Instrument AB has introduced the next generation of its shock pulse method. SPM HD (High Definition) is an advanced measuring technique suitable for all types of applications and well suited for low speed machinery.

The technique combines the True SPM method with an advanced digital technique. SPM HD can distinguish weaker yet relevant signals, which are typically hidden among stronger signals caused by mechanical shock phenomena or electronic noise. The ability to detect very weak signals is useful when measuring at low speeds. Testing has provided up to six months warning, leaving time to plan maintenance.

The technique works with digital enveloping of the analog shock pulse transducer signal. The sampling frequency is high, resulting in a distinct signal. A 24-bit A/D converter provides razor-sharp resolution and detail in spectrums and time signals.

For a full picture of bearing condition, the measuring cycle is based on number of revolutions rather than time.