CESVA VC431, Руководство пользователя, Страница: 6 / 72

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1. GENERAL DESCRIPTION
The VC431 is a high-performance triaxial vibrometer in accordance with the 8041:2005 and
ISO 8041:2005/Cor1:2007 standard.
The VC431 is the ideal instrument for the evaluation of human exposure to vibration
according to:

The Directive 2002/44/EC on risks derived from exposure of workers to vibrations:
o
Vibrations transmitted to the hand-arm system [ISO 5349-1 and ISO 5349-2]
o
Vibrations transmitted to the whole body [ISO 2631-1]

National laws and regulations on noise and vibrations:
o
Whole body in buildings vibrations [ISO 2631-2]
The VC431 can also evaluate the effect of vibration on the structure of buildings and the
terrain:

The UNE 22-381-93 Standard Control of vibrations produced by blasting with explosives
and transmitted by the terrain.
1.1 Operating modes and functions
The VC431 has the following applications:

The HAND-ARM application is designed to measure vibration transmitted to the hand-arm
system according to the ISO 5349 Standard, as recommended by DIRECTIVE
2002/44/EC.
The evaluation of the level of exposure to the vibration transmitted to the hand-arm
system is based on the measurement of the daily vibration exposure value, normalised for
a reference period of 8 hours, A(8), of the total acceleration value, expressed as the
square root of the sum of the squares of the RMS values of acceleration with frequency
weighting, determined according to the orthogonal axes a
hx
, a
hy
y a
hz
, as defined in the
ISO 5349-1 Standard. To perform these measurements it is necessary to have the triaxial
accelerometer
AC031 . The VC431 measures the following functions
simultaneously:
The VC431 makes it possible to make measurements during a shorter time than the
exposure time and evaluate the projected daily exposure to vibration value A(8)
p
for a
programmable projection time (forecast exposure time).

The WHOLE BODY application is designed to measure the vibrations transmitted to the
whole body according to the ISO 2632-1 Standard, as recommended by the DIRECTIVE
2002/44/EC.
a
hx
RMS value of acceleration on the x axis with W
h
weighting
a
hy
RMS value of acceleration on the y axis with W
h
weighting
a
hz
RMS value of acceleration on the z axis with W
h
weighting
a
hv
Total value of acceleration
A(8) Daily exposure to vibration
A(8)
p
Projected daily exposure to vibration