SKF CMSS500 Series, User Manual, Page: 54 / 76

Installing the Machine Condition Transmitter
RMS Measurements with the Microlog (Acceleration and Velocity)
4- 8 SKF Machine Condition Transmitter
User Manual
Peak to Peak readings on the Microlog can be compared
to the Peak reading of the MCT module. This difference
of detection method is based upon the fact that the
Microlog has an AC coupled signal processing path, while
the MCT modules use a dc coupling.
RMS Measurements with the Microlog (Acceleration
and Velocity)
The buffered vibration output is used as an input to the
Microlog. The Microlog's frequency settings must be
equal to the filter bandwidth settings of the (Velocity)
MCT CMSS530 module. The detection method must be
set to RMS.
Important - The MCT VEL module uses an analog filter
and integrator which measure continuously.
The Multilog and Microlog calculate the RMS value from
the spectrum, which is not continuously processed. This
discontinuity, which is minimized by selecting the Hanning
window, may cause low frequency problems which result
in ski-slopes after integration. These possible ski-slope
effects may have large influences on the RMS overall
velocity reading.
Peak Detection in Velocity
The MCT velocity modules with peak detection provide a
true peak reading, in contrary to the older MCM modules,
which provided a "pseudo" peak, derived from the RMS
reading. True peak detection typically results in higher
values when data is collected at the same measurement