Larson Davis HVM200 - Page 84

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
8Hours
-------------------
a
w
2
ttd
0
T

=
A 4
1
4Hours
-------------------
a
w
2
ttd
0
T

=
A 2
1
2Hours
-------------------
a
w
2
ttd
0
T

=
A 1
1
1Hours
-------------------
a
w
2
ttd
0
T

=







P 100
E
ka
a
T
hours
2
8
w
exp
Arms
1

---
a
w
2
ttd
t
0

t
0

=
-