Type
2512
Human-Raaponse
Vibration Meter
"Eq.
Exp.%"
- The Equivalent Exposure as a percentage of the vibration
dose allowed for the measurement period. The overload indicator lights
permanently if the equivalent exposure exceeds 9999% and lights for a
period of approximately two seconds each time the RMS acceleration
during a two second dose calculation period exceeds the permissible level
for the shortest exposure time considered by the standard applicable to the
selected measurement mode, or
2 minutes in the MOTION SICKNESS
mode. Dose calculation continues normally, however, with the maximum
permissible value used
in
the dose calculation.
"Leq dB" - The equivalent continuous vibration level; a logarithmic function
of the frequency-weighted energy mean vibration level averaged over the
entire measurement period. The overload LED lights when the
Leq
calcula-
tor
memory is full. This occurs between
17
and 53 minutes after the start of
measurement, depending on the level of the signal. The value is presented
in dB
re.
10-B
ms-
2
.
"Peak dB" - Displays the maximum peak level which occurs during the
measurement period. The value is presented
in
dB
re.
10-B
ms-
2
.
The
overload LED indicator comes on if the peak frequency weighted level
exceeds the maximum allowable value at any time during its passage
through the instrument and remains lit for the duration of the overload and
at least
130
ms. Overload detection is thus carried out at a large number of
positions in the circuit.
"Elapsed Minutes" - Displays the elapsed time of the current measure-
ment with 0, 1 minute
(6
s)
resolution.
O.l - 0,63
Hz
Motion Sickness
•
z-
a;
~:uced
Comfort
Severe
Discomfort
Measurement
-
L
Preset-'
,------lnnur---------.
l (X)
;HY}
3 {Zl
•
00('
)(
Fig.
2.3.
Measurement selection
and
control
2.1.3. Measurement Selection and Control
The measurement selection and control switches are divided into two main fields concerned
with the selection of criteria for either whole body or hand-arm vibration, and the measurement
start/stop and interface switches as follows:
1 1
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