CEMB USA N500 - Manual (Page 46)

7 - 4 Balancer mode
For example, for a rotor with speed of rotation 600 RPM, it could be necessary to
wait up to 10 seconds before being able to view the first result of the measurement.
3. Unit of measurement of the vibration
This is the unit of measurement in which to supply the vibration to the sensors:
–
acceleration (g (acc))
–
speed (mm/s, inc/s)
–
displacement (µm or mils)
N.B.
In order to avoid possible confusion with grams (often used for expressing the
unbalance in the metric system), in the Balancing functions, the symbol
g (1 g = 9.81 m/s
2 ) is accompanied by the explicit indication acc (acceleration)
given alongside between brackets.
4. Type of vibration measurement
The vibration measured by the sensors can be expressed in three different types:
- RMS (Root Mean Square):
This is the average value of the vibration previously squared;
It is the one typically used, especially for measurements of acceleration or
speed.
- PK (Peak):
This is the maximum value reached by the vibration in a certain interval of
time.
- PP (Peak-to-Peak):
This is the difference between maximum value and minimum value reached
by the vibration in a certain interval of time;
It is normally used for measuring displacement..
Confirmation of the settings made (with ) creates a new balancing program
not associated with any name, seeing as though it is directly accessible as current program.
Only when saving in the archive, will there be a request to the operator to enter a special
name which will characterize it from that moment on.