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Vibration Level
For ease of use and where high levels of vibration may occur, the Pocket
Meter Vibration Range has been designed with 2 operating ranges.
Before you record measurements take the time to ensure you have selected
the optimum range for the process being recorded.
Generally the optimum range is generally the lowest range that can be
selected that does not produce an overload condition for the process being
monitored.
Where high levels of vibration are encountered the meter may register an
overload and in these circumstances the meter will display that this has
occurred. In such cases you will need to select a higher range to
accommodate the higher peak levels.
If the vibration levels are too low for the range selected then the meter will
display an under range condition. Under these circumstances you will need to
select a lower range.
Frequency Weighting
Vibration damage to the hand occurs when the hand absorbs the majority
of the vibration energy. If the vibration is slow, the wrist and arm joints will
damp the vibration energy. If the vibration is fast, the skin of the hand will
absorb the energy. In between, the hand itself absorbs vibration energy.
The HARM filter (GA2003 Only) selects the most harmful frequencies to a
human. The value given using the HARM filter displays not how much the
machine is vibrating but how much vibration is being absorbed by the hand.
The HARM frequency response is shown graphically below: -
-110
-90
-70
-50
-30
-10
0.01
0.1
1
10
100
1000
10000
Frequency (Hz)
G
a
in
(
d
B
)
