Rion VM-55, Instruction Manual, Page: 31 / 204

19
Preparations
Accelerometer placement and connection
Vibration axis
Environmental vibrations are normally measured in two horizontal planes
(front/back and left/right) and one vertical plane. This means that complex
vibration phenomena are reduced to three axes (X, Y, Z), for easier observation.
The axes are defi ned as follows (facing the vibration source).
Horizontal front/back: X
Horizontal left/right: Y
Vertical: Z
Z axis
Vibration
source
Accelerometer
PV-83C
Accelerometer
PV-83C
Vibration
source
X axis
Y axis
Accelerometer
PV-83C
X axis
Y axis
Note
In the horizontal plane, the X axis and Y axis will be re-
versed when seen centered on the movement direction of the
vibration source.