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BRUEL & KJAER 4111 - Page 17

BRUEL & KJAER 4111
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14
both
in·
decibels
and
phons,
as
the
instrument
also
includes
the
three
antisonoric
frequency
curves
for
0-30,
3\J-
60
and
60-130
phons,
con-
structed
according
to
the
standards
DIN
5045
and
ASA
Z
24.
3,
which
are
ve
.
ry
close
to
each
other.
(See
p.
?.1 ).
~60f
@
®
•
Fig.
11.
Recording
of
sound
pressure
level
or
noise
level
on
Level
Recorder
2304
and
direct
adjustment
of
the
combination
Microphone
Amplifier
2601
-
Level
Recorder
23\J4
to
obtain
calibrated
ordinate
values
on
the
recording
paper.
When
the
condenser
microphone
is
employed
together
with
the
Micro-
phone
Amplifier
2601
and
the
Level
Recorder
2304,
and
a
recording
of
any
kind
of
sounc;l
or
noise
is
wanted,
together
with
the
absolute
values
of
the
sounr
pressure
or
noise
level,
the
method
of
fig.
11
can
be
used.
The
10
j
mV
reference
voltage
of
the
level
recorder,
which
I .
value
should
be
c~ecked
accurately
w1th
a
VT
voltmeter,
is
led
from
the
jack
below
the
\
potentiometer
on
the
instrument
(
1)
to
the
micro-
\
phone
amplifier
inpu
t (
2)
via
a
screened
cable
(remember
to
ground

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