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BRUEL & KJAER 2225 User Manual

BRUEL & KJAER 2225
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3.5.2.
Procedure
for
Sound
Level
Measurements
1.
Calibrate
the
meter
and
check
the
batteries.
See
Section
3.4.
2.
Set
the
FUNCTION SELECTOR
switch
as
follows:
"Fast"
"Slow"
"60S
L
eq"
"Peak"
"Impulse"
for
normal
sound
level
measurements.
if
the
display
fluctuations
in
the
"Fast"
position
are
too
large
or
too
fast
for
accurate
readings.
If
a
longer
averaging
time
is
required
to
obtain
meaningful
short
term
measurements
of
fluctuat-
ing
or
cyclical
noise,
or
when
an
Leq,
noise
dose,
or
SEL(LAx)
is
required
directly.
For
example,
for
the
evaluation
of
noise
annoyance
(Leq
),
the
as-
sessment
of
hearing
damage
risk
(noise
dose),
or
comparison
of
the
annoyance
of
similar
events
(SEL(L AX)).
(2225
only)
to
hold
the
maximum
peak
value
of
the
signal.
(2226
only)to
obtain
the
subjective
level
of
impul-
sive
sounds.
Note:
The
normal
mode
of
operation
of
the
Type
2226
is
"Max.
hold".
Continuous
display
of
fluctuating
Sound
Pressure Levels can be
obtained
simply
by
inserting
the
"DC
Output"
plug.
3.
Set
the
RANGE SELECTOR
switch
so
that
the
level
indicated
is
in
a
convenient
posi-
tion
on
the
display
which
does
not
exceed
full
scale
or
cause
overload.
4. It
may
sometimes
be
necessary
to
make
measurements
in
the
presence
of
back-
ground
noise,
which
will
contribute
to
the
measured
level
and
for
which
a
correction
~
Cl
6
c
~
~
\
\
-ro
s
5
E
_g
1
4
.0
~
3
<1>
.0
B
co
"0
2
0
<1>
.0
E
::J
z
~
\
~
\
'\
I"
"
""-
.........
.......
...........
r--..
1-o....
.........
~
r--
-
0
0
2
3
4
5 6
7 8
9
10 dB
Difference between total reading and background reading
171139
Fig. 3. 4.
Correction
curve
for
the
influence
of
background
noise
11

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BRUEL & KJAER 2225 Specifications

General IconGeneral
BrandBRUEL & KJAER
Model2225
CategoryMeasuring Instruments
LanguageEnglish

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