CEMB USA N500 - Manual (Page 25)

Vibrometer mode 5 - 1
Chapter 5
Vibrometer mode
One of the simplest, but at the same time most significant information in vibration analysis,
is the overall value of the actual vibration. In fact, this is very often the first parameter to be
considered when evaluating the operating conditions of a motor, fan, pump, machine
tool...
Appropriate tables allow discrimination between an optimum state and a good state, or
from an allowable, tolerable, non-permissible or even a dangerous one. (see Appendix B
– Evaluation criteria).
In certain situations instead, it could be interesting to know the values of modulus and
phase of the synchronous vibration (1xRPM), i.e. corresponding to the speed of rotation of
the rotor.
The vibrometer mode is designed to make this type of measure and also makes available
two monitoring functions, for observing the trend of vibration plotted against time or
against variation in rotor speed.
Vibrometer setup
Settings required for correct measurement of the overall value are selected in the
VIBROMETER SETUP page.
1. Unit of measurement
Select the unit of measurement in which to supply the vibration; possibilities are as follows:
–
acceleration (g)
–
speed (mm/s or inch/s)
–
displacement (µm or mils)