CEMB USA N300 - Manual (Page 25)

Vibrometer function 5 - 1
Chapter 5
Vibrometer function
One of the simplest, but at the same time most important, values in vibration analysis is the
overall value of the vibration itself. This is often the first parameter to consider when
assessing the operation of a motor, fan, pump, machine tool, etc.
Suitable tables are used to discriminate between an excellent condition or a good,
acceptable, tolerable, unacceptable or even dangerous condition. (see Appendix B –
Judgement criteria).
In some cases it may be interesting to know the synchronous vibration modulus and phase
values, that is to say corresponding to the rotating body’s rotation velocity (1xRPM), or its
multiples (2xRPM, 3xRPM, 4xRPM, 5xRPM).
The vibrometer function can be used to take this type of measurement easily and
intuitively, saving the results in a special record.
Measurement settings
The settings used to measure vibration are all displayed in the Vibrometer page and can be
adjusted by pressing the key: for greater clarity all measurement results are hidden,
with only adjustable parameters remaining visible. Before changing the settings make sure
that the channel displayed in the upper left hand corner is the one that you wish to change;
otherwise change it using the key .
The parameter that can be changed is displayed in negative, by pressing the
and the
arrows you can scroll through all of the values that can be selected. With the
and keys, you can move to the previous or next parameter.
These can be divided into two categories:
− specific, only valid for the channel displayed at that time
− common, which automatically apply to both: this group includes anything concerning
the type of measurement required