Larson Davis HVM100, Manual

Page: 129 / 174

4/11/03 B-1
A P P E N D I X
B
Glossary
The following appendix contains definitions and explana-
tions of terminology used in the HVM100
Table of equations
The following table gives many of the calculations the HVM
performs to arrive at the results reported by the instrument.
Description Equation
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)
Aeq
1
T
--- a
w
2
t
( )
t d
0
T
∫
=
Aeq 20Log
1
T
---
a
w
2
t
( )
a
o
2
-------------
t d
( )
B d
0
T
∫
=