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The dBm/dBc technique
The dBm/dBc technique is well established and well suited for industrial condition monitoring, working
with few, easy to understand in- and output data.
Even on a logarithmic scale, there is normally a large, distinct difference between the maximum values
from good and bad bearings. Thus, minor inaccuracies in the input data (rpm and shaft diameter) have
little effect on the evaluated measuring result.
Lubrication condition is indicated by the delta value, i.e. the difference between dBm and dBc. High readings
and a small delta value indicate poor lubrication or dry running. This is sufficient for maintenance purposes.
dBm and dBc are measured in a fixed time window and automatically displayed.
The headphone is used to listen to the shock pulse pattern in case of suspect or high readings. This, and
the possibility to search for shock pulse sources with the probe transducer, are means to verify the measur-
ing result and its cause.
Life time
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