Larson Davis HVM200, Manual

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HVM200 Reference Manual C-2
Energy
Equivalent
RMS
Acceleration
The HVM200 measures the following quantities:
Exposure
Points (P
E
)
a
w
= the vibration magnitude in m/s
2
.
T= the exposure time in hours.
k
= the multiplying sum factor for the individual axis.
a
exp
= the exposure action value.
The summation measurement exposure points will be the maxi-
mum of the three axes exposure points.
Running RMS
Acceleration
LINEAR

Integration time, in seconds.
t
o
= Observation time
The linear Arms integration time is controlled by the Averaging
time setting; a new linear Arms value is calculated and dis-
played at the end of each integration period.
Term Equation Description
A
8
 
1
8
Hours
-------------------
a
w
2
t
 
t
d
0
T
 =
A
4
 
1
4
Hours
-------------------
a
w
2
t
 
t
d
0
T
 =
A
2
 
1
2
Hours
-------------------
a
w
2
t
 
t
d
0
T

=
A
1
 
1
1
Hours
-------------------
a
w
2
t
 
t
d
0
T
 =
 





P
100
E
ka
a
T
hours
2
8
w
exp
Arms
1

---
a
w
2
t
 
t
d
t
0

t
0
 =
-