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.