CEMB USA N300 - Manual (Page 36)

6 - 2 Balancing function
Warning:
Take great care when positioning the photocell: as the rotating body requires
manual intervention, make sure that it is still and cannot be started up accidentally.
If the rotating body cannot be rotated by hand when positioning the photocell, it
should be positioned in points in which the LED is visible without having to get
too close to the moving bodies.
Further information can be found in the appendix entitled Balancing precision for rigid
rotating bodies.
The balancing procedure is composed of two parts:
− calibration: a series of spins are used to determine the parameters required to balance
a determined rotating body;
− unbalance measurement and calculation of the correction.
Although calibration may be a laborious process, it is essential for it to be carried out
correctly to avoid introducing errors in the subsequent calculation of the correction masses.
The instrument automatically records the data and parameters from the last balancing
operation carried out, proposing them to the operator the next time the calibration page is
opened, even when the instrument has been turned off and on again.
Warning:
To use the calibration parameters from the previous balancing operation, the
transducers must be placed in exactly the same position on the rotating body. This
is relatively simple when using threaded holes, but can be more difficult with
magnetic bases. Remember that a small difference, even of just a few millimetres,
could make the previous calibration unsuitable.
For greater accuracy we recommend that the instrument is fully calibrated
before every new balancing operation.