Larson Davis HVM200 - Appendix C Glossary of Terms; Key Measurement Terminology

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 select-
able)
Allowed
Exposure Time
a
L
is user selectable.
A8Exp: a
L
typically = 5
A8Act: a
L
typically = 2.5
Aeq
1
T
---
a
w
2
ttd
0
T

=
Aeq 20Log
1
T
---
a
w
2
t
a
o
2
--------------
td Bd
0
T

=
a
L
ms
2



Aeq
2
8hours