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BRUEL & KJAER 2225 - Page 20

BRUEL & KJAER 2225
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14
7.
Slide
the
RANGE SELECTOR
of
the
meter
to
give
the
50
to
90
dB(A)
range.
8.
Adjust
the
SENSITIVITY
potentiometer
on
the
2306
so
that
the
pen
lies
exactly
on
the
third
line
from
the
top
of
the
recording
paper.
This
position
should
be
noted
as
the
94
dB
calibration
level. See Fig
.4.
1.
The
meter
will
indicate
full
scale
deflection
(
90
dB(A)),
but
the
DC
output
will
be
unaffected
i.e.
it
will
give
an
output
correspond-
ing
to
94
dB as
the
instrument
has
20
dB
extra
range
over
that
displayed.
9.
Select
suitable
measuring
range
on
the
RANGE SELECTOR
and
set
FUNCTION SE-
LECTOR as
required.
Remember
to
note
the
range
used
on
the
Level
Recorder
paper.
For
any
range
chosen
the
bottom
line
on
the
paper
corresponds
to
the
lowest
value
on
the
instrument
display
scale,
when
the
above
procedure
is
followed.
The
Level
Recorder is
now
calibrated
and
ready
for
use.
Alternative
Calibration
Method
The
following
procedure
can be
carried
out
without
using
a
calibrator,
but
therefore
as-
sumes
that
the
Sound
Level
Meter
is
itself
correctly
calibrated.
1.
Carry
out
steps 2
to
5 as above
2.
Slide
the
RANGE SELECTOR
of
the
meter
to
give
the
range
50
to
90
dB(A)
and
se-
lect
60s
Leq
on
the
FUNCTION SELECTOR.
3.
Obtain
a steady reading
in
the
upper
region
of
the
display,
by
clapping
the
hands
for
example
.
As
an example, suppose a
reading
of
84
dB(A) is
obtained
.
4.
Adjust
the
pen
position
using
the
SENSITIVITY
potentiometer
of
the
2306
so
that
it
indicates
the
displayed
value
on
the
paper.
(See
Fig.4.2)
The
top
of
the
meter
dis-
play
should
correspond
to
the
2nd
thick
line
from
the
top
of
the
recording
paper
and
the
bottom
of
the
display
correspond
to
the
bottom
line
on
the
paper
.
5 .
Select
suitable
measuring
range
on
the
RANGE SELECTOR
and
set FUNCTION SE-
LECTOR as
required.
Remember
to
note
the
range
used on
the
Level
Recording
Paper. For
any
range
chosen,
the
bottom
line
of
the
paper
corresponds
to
the
lowest
value
on
the
instrument
display
scale,
when
the
above
procedure
is
followed.
ODDOOODODODOODODDOOOOODC
1
OO
Br
ii
el &
Kj
oo
r
Meter
Display
90
-
r---
Ref.
so
::::r=
ltem 4
70
60
Scale
Bottom 50
QP
01 0 2 7
80898
/ 1
Fig. 4. 2.
Calibrating
the Type
2306
using
Alternative
method
Typical
examples
of
recordings
made
w i
th
various
meter
functions
are
shown
in
Fig.4
.3.

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