Larson Davis HVM200, Reference Manual

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HVM200 Reference Manual C-1
Appendix
C Glossary of Terms
The following table contains definitions and calculations for terminology used in the HVM200 manual.
Term Equation Description
RMS Acceleration
T = Integration time in seconds.
a
w
(t) = instantaneous acceleration.
t = Time, in seconds.
The Aeq integration time is from Run to Reset; the display is updated once per second.
RMS Acceleration in
Decibels
a
o
= reference acceleration, 10
-6
m/s
2
or 10
-5
m/s
2
(user selectable)
Allowed Exposure
Time
a
L
is user selectable.
A8Exp: a
L
typically = 5
A8Act: a
L
typically = 2.5
Aeq
1
T
---
aw
2
t   t
d
0
T

=
Aeq 20 Log
1
T
---
aw
2
t  
ao
2
--------------
t
d
  B
d
0
T

=
aLm s
2

 
 
Aeq   
2
8 hours 