MMF VM30-H, Инструкция по эксплуатации, Страница: 38 / 58

Figure 23: Excel import of logger data
If data transmission has failed, please check if you have selected the correct serial interface
number (Figure 21) and if the baud rates of the Excel macro and the VM30-H match. After
checking these settings you can repeat data transmission. The stored data remains in the VM30-
H memory until it is erased by the user (MENU, „4/8: Erase memory“).
The data imported into Excel can now be processed according to your requirements.
Notice: Data recorded in the logger mode may have different units depending on the magnitude,
like mm/s or m/s. The Excel macro transforms all measuring values into m/s², mm/s or µm.
13.3. Calculation of the Daily Exposure Value A(8)
The daily exposure value A(8) helps to compare the vibration exposure for different persons and
activities. A(8) is also the basis for the determination of the "daily exposure limit" and the "daily
exposure action value" according to the EU directive 2002/44/EC. More information concerning
this directive can be found at:
http://www.mmf.de/PDF/AN21e-Human Vibration, EC Directive.pdf
The daily exposure value A(8) is calculated as follows:
A

8
=
A
hv

T
T
0
where
A
hv
is the vibration total value (see page 26)
T is the total duration of the exposure to A
hv
during a work day
T
0
is the reference duration of 8 hours
If the work is separated into several activities with different vibration exposures, the daily
exposure value can be calculated as follows:
A

8
=

1
T
0
∑
i
=
1
n
A
hvi
² T
i
where
n
is the number of activities
A
hvi
is the vibration total value of the i th activity
T
i
is the duration of the i th activity
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