MMF VM30-H, Инструкция по эксплуатации, Страница: 17 / 58

The following measuring points are suitable:
•
On the seat surface under a seated person
•
On the back rest behind a seated person
•
Under the feet of a seated person
•
Under the feet of a standing person
•
Under the pelvis of a recumbent person
•
Under the head of a recumbent person
Figure 7 shows the coordinate systems for whole-body vibration to ISO 2631. As can be seen
from the drawing, the Z axis always points in the direction of the spinal column. The vibration
sensor has to be placed accordingly. A special case is measurement at the backrest (see notice on
page 23).
5.3.2. Settings at the VM30-H
For whole-body vibration interval RMS is measured for each coordinate direction.
Select first the measuring ranges for X, Y and Z. A good method is starting with the most
sensitive range. Press the MENU key and open the menu “1/8: Gain” with OK. Set the
measuring ranges for X, Y and Z to 12 m/s² using the ▲▼ keys and confirm each entry with
OK (see p. 28).
Presse the key ▲ (Range) and select “human vibration” with the ▲▼ keys.
The next step is selecting the weighting filter with ▲▼. There are different weighting filters for
each vibration entry point. The weighting filters are marked with W
x
. The filter curves can be
seen in Figure 8.
12
Figure 7: Coordinate systems for whole-body vibration to ISO 2631
Z
Y
Z
Y
Z
X
Y
Z
X
X
Y
X
Y
Z
X