http://www.bently.com/bnc/pr35421099.htm
The shaft absolute measurement is a new, configurable option for the 3500/42 monitor module, a generically programmable 4-channel card that is used to make other common vibration and position measurements. The shaft absolute measurement is frequently required on large steam turbines as an indication of the shaft's vibration relative to free space, and has value for both mechanical diagnostic purposes and for comparison with historical machinery data based on shaft absolute measurements.может хоть это поможет
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