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BRUEL & KJAER 4131 - Quarter-Inch Condenser Microphone

BRUEL & KJAER 4131
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1135
·
4136
-
DESCRIPTION
Microphone
Amplifier
Fig. 1.2.
Typical
B ,& K
measuring
equipment.
Both
amplifier
and
level re-
corder are linear
up
to
200
kHz.
A filter
set
(Type
1612) is also available for
automatic
plotting
of
spectrograms
in
the
range 22
Hz-45
kHz.
Quarte·r-inch Condenser Microphone Cartridges.
Two
different
types
are
available:
1.
The
Microphone
Cartridge
Type
4135,
with
a
sensitivity
of
o.2 mV/,ubar,
featuring
a
free-field
frequency
characteristic
which
is
flat
up
to 100
kHz
and
a
dynamic
range
going
up
to
174 dB.
2.
The
Microphone
Cartridge
Type
4136,
with
a
sensitivity
of
o.l
mV/,ubar
,
having
a
pressure
frequency
characteristic
which
is
flat
up
to
70
kHz
and
a
dynamic
range
going
up
to
180 dB.
The
difference
in
characteristics
is
illustrated
in
Fig. 1.3.
The
two
cartridges
have
the
same
mechanical
construction
(Fig. 1.4)
differing
only
in
the
diaphragm
which
is 2
,u
(80 tt")
thick
in
the
case
of
the
4135
and
6
,u
(240 ,u")
thick
for
the
4136.
The
latter
thickness
and
the
shape
of
the
back
plate
have
been
determined
in
order
to
achieve
the
critical
damping
of
the
diaphragm
resonance
of
the
4136.
In
this
way
the
widest
possible
flat
frequency
range
of
the
pressure
response
is
obtained.
To
the
thinner
diaphragm
of
the
4135
corresponds
a
higher
damping
factor
and
thus
a
fall
of
the
pressure
response.
The
thickness
of
2
,u
has
been
chosen
in
order
to
obtain,
a
fall
in
pressure
response
which
compensates
exactly
the
free-field
pressure
increase
at
normal
incidence
for
the
cartridge
without
protecting
grid.
The
pressure
increase
with
grid
is
appreciably
higher
and,
above
50
kHz,
it
is
rather
dependent
on
how
tight
the
grid
is
screwed
on
the
cartridge.
Measure-
8

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