Table of Contents
Advertisement
Page 8
Figure 9 shows the axis directions for attaching the sensor to the handle. For cylindric
handles the Y direction points in the direction of the handle axis. The Z axis is
approximately the extension of the third metacarpal bone.
Figure 9: Coordinate system of the hand (from ISO 5349-1)
CV:31A Settings for Hand-Arm Vibration measurements
For the evaluation of hand-arm vibration it is recommended
to measure both the interval RMS values of X/Y/Z and their
vector sum a
.
W
The vector sum of the RMS values is displayed on the screen
as a
(Vec).
w
This is also known as a
The CV:31A measures these four values simultaneously. In
addition it shows the maximum running RMS (Maximum
Transient Vibration Value, MTVV) which may indicate the
presence of shock vibration.
The frequency weighting for hand-arm vibration is Wh.
Appendix 2 shows the filters of the CV:31A and the tolerance bands to ISO 5349.
Press the F3 key to open the main menu and select
Human vibration
Hand-Arm ISO 5349
After returning to the measurement screen you can check the settings by pressing F1.
Measurements can begin when the sensor and the worker's hands have been placed on
the handle of the object carrying out the operation. To start the measurement press the
key ► (Reset). This will result in the following:
•
the RMS values of X/Y/Z, the vector sum a
•
the measurement timer restarts
CV:31A Vibration Meter User Manual
as described in ISO 5349-1:2001.
hv
Health
and MTVV reset to zero
W
Advertisement
Table of Contents
