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BRUEL & KJAER 2512 - Introduction and Standards; Human-Response Vibration Meter Type 2512 Introduction; Basic Operating Procedure

BRUEL & KJAER 2512
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Standards and Recommendations
Human-Response
Vibration
Meter
Type
2512
is designed
to
make
fre-
quency-
and
time-weighted
vibration
measurements
in
accordance
with
( 1)
International
Standard ISO
2631
-
1
978,
"Guide
to
the
evaluation
of
hu-
man
exposure
to
whole-body
vibra-
tion"
. (2)
Draft
Amendment
to
ISO
2631
DAM
1
submitted
14-2-80
(3)
Revised
draft
addendum
to
ISO
2631
DAD 2
(16-9-80).
"Evaluation
of
ex-
posure
to
whole-body
z-axis vertical
vibration
in
the
frequency
range
0.1
to
0,63
Hz. (4)
Draft
International
Standard
ISO/ DIS
5349.
Submitted
1
8-1-1
979,
"Principles
for
the
meas-
urement
and
the
evaluation
of
hu-
man
exposure
to
vibration
transmit-
ted
to
the
hand"
.
Numerous
national
standards
can
be
expected
to
appear
which
will
be
based
on
these
international
docu-
ments
.
Current
status
of
both
na-
~ional
and
international
standards
should
be requested
from
the
rele-
vant
national
standards
institute.
Triaxial Seat-Accelerometer Type
4322
is
dimensioned
i~ accordance
with
the
requirements
of
SAE Recom-
mended
Practice J
1013
(1973).
Human-Response
Vibration
Meter
Type
251
2
Introduction
Human-Response
Vibration
Meter
Type
251
2
is
a
dedicated,
battery
operated
instrument
for
measuring
vibratory
motion
with
respect
to
its
ability
to
cause
discomfort
or
dam-
age
to
the
human
body
. The
instru-
ment
is
conditioned
to
measure
vi-
brption
in
accordance
with
criteria
laid
down
in
several
national
and
international
standards
and
recom-
mendations.
Three
categories
are
covered: ( 1)
"Whole-Body"
vibration
relative
to
the
"Reduced
Comfort",
"Fatigue
Decreased
Proficiency"
and
"Exposure
Limit"
boundaries
(2)
"Hand-Arm"
Vibration
covering
vibration
from
tools
and
appliances
held
in
th
.e
hand,
and
including
cor-
rection
factors
for
interrupted
use,
and
(3)
"Whole-Body
Vibration"
at
very
low
frequencies
which
causes
"Motion
Sickness"
(dealt
with
in
an
addendum
to
the
"Whole-Body
standard"*).
The
standards
and
recommenda-
tions
define
frequency
dependent
vi-
bration
amplitude
limits
for
various
periods
of
exposure
and
for
various
degrees
of
discomfort
or
danger.
As
the
limits
are
both
frequency
and
time
dependent,
both
factors
need
to
be
included
in
any
calculation
to
obtain
the
degree
of
discomfort
or
danger.
Human-Response
Vibration
Meter
Type
251
2 is
equipped
with
the
appropriate
frequency
weighting
filters
and
time
weighting
functions
to
enable
a
single
figure
measure
of
the
severity
of
the
motion
to
be
ob-
tained.
*
Additionally
included
in
251
2 is a
"reduced
comfort"
mode in
the
motion
sickness cate-
gory
of
whole-body
vibration
,
this
is valu-
able
for
research-oriented
measurements
.
2
Measured
values
are
computed
and
displayed
in
three
different
modes; (1)
the
equivalent
exposure,
expressed
as a
percentage
of
the
vi-
bration
dose
allowed
for
the
mea-
sured
time;
(2)
the
equivalent
RMS
vibration
level (Leq)
over
a
c~osen
measurement
period;
and
(3)
the
maximum
peak
vibration
level
which
has
occurred
during
the
chosen
measurement
period
.
Auto-
matic
hard-copy
print-out
of
the
measured
levels
can be
obtained
from
an
Alphanumeric
Printer
Type
231
2
or
any
printer
equipped
with
an IEC
compatible
interface
bus
.
Basic Operating Procedure
One
of
the
three
possible
input
signals
is
chosen
by
means
of
the
"Input"
selector
switch.
As
security
against
losing
previously
accumu-
lated
data both
"Measurement"
,;"·
,,,
-~
....
..
,,.,
...
,,,,)
...
,
"Start"
and
"Stop"
pushbuttons
must
be
depressed
simultaneously
before
the
vibration
category
i. e.
"Whole-Body"
"Hand-Arm",
or
"Mo-
tion
Sickness",
together
with
the
relevant
discomfort
or
danger
crite-
rion,
may
be
selected
.
The
measure-
ment
period
is
commenced
by
de-
pressing
"Start".
At
any
time
dur-
ing
measurement
the
"Display
Mode"
switch
may
be
moved
at
will
to
display
the
accumulated
expo-
sure
dose
("Eq.
Exp."),
the
equiva-
lent
continuous
level
("Leq
"),
the
maximum
peak
level,
or
the
elapsed
time
from
the
start
of
the
measure-
ment
period
.
Depressing
"Stop"
in-
terrupts
measurement
but
the
meas-
urement
may
be
restarted
by de-
pressing
"Start"
without
losing
data
already
accumulated.
Pressing
"Start"
and
"Stop"
simultaneously
clears
all
accumulated
data
.
Ext
.
filter
In
In
Out
1' Reset O , Accumulate
' 7 1: Printer o,
CalculallK
4
3
*CAUTION
1:
Ton
AS
MSB
A4
A3
A2
Al
LSB
I
Device
Address
CHARGE
VOLTAGE
MUST
ONLY
BE
APPLIED
WHEN
USING
RECHARGEABLE
BATTERIES
Fig,
1.
Rear
panel
view
of
the
Human-Response
Vibration
Meter
Type
2512

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