CEMB USA N500 - Manual (Page 27)

Vibrometer mode 5 - 3
N.B.
Use of the CUSTOM frequency band is only recommended for expert users who
have sound knowledge of the basic concepts in digital signal processing. In fact, an
incorrect choice of sampling parameters could lead to unsatisfactory results. For
example, with too low a f
max
, there is risk of losing important high frequency
information; on the other hand, with too high a frequency, the resolution could be
insufficient to distinguish the two peaks.
4. Average N°
This is the number of value which should be calculated and averaged between each other
to increase stability of the measurement. Four averages are more than sufficient for normal
vibration measurements on rotating machines.
After making the required settings, press to access the VIBROMETER
Measurement screen.
Vibrometer – Measurement screen
The Measurement page supplies a series of information, organized as shown in the figure:
1. channel measured
2. measurement information: indicates unit of the sensor (A, V or D) and any
conversion made to supply the overall value (e.g. AÆV means that the measurement
is made with an accelerometer, but the vibration is supplied in speed)
3. overall value of the vibration
4. unit of measurement
5. type of measurement
6. value of the synchronous vibration
7. phase of the synchronous vibration
8. speed rotation of rotor
9. signal level bar
1
3
8
4
5
2
6
7
9
10