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BRUEL & KJAER 4111 - Page 6

BRUEL & KJAER 4111
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3
ly
on
the
microphone
membrane,
with
the
protective
grid
removed.
(A
correction
for
the
influence
of
this
grid,
which
under
routine
mea-
surements
should
be
employed
in
all
cases,
follows
on
p.
5 ).
The
straight
curve
from
15
to
20.
ooo
c/s
is
the
response
of
the
cathode
follower
alone
(with
a
capacity
of
5.
ooo
pF
across
the
input).
The
factor
k
is
the
distance
of
the
membrane
above
the
edge
of
the
car-
tridge,
which
is
a
necessary
datum
when
checking
the
sensitivity
by
:neans
of
the
Electrostatic
Actuator
type
4113
(see
p.
24).
11
..
w,_
;
,......_,.
,.......
.,.
IIP4_,.
c
adlo4e
t.ll
--
~h
lctl
utr
l
4te
It
c.ca4
.
*···
·
-
~
.
~
~~~.::~:f!J;:r
;
;;~yr.:.~
;
~
:
.~~
:
-~;;
~
M.
POCMt
!.mettor :
l$4!.
DM•
11
1:6 •
$S
SI
I"·
...
Ief8
.
Fig.
3.
Example
of
an
individual
calibration
·
curve
for
the
microphone
fitted
with
a
specified
cartridge
and
with
a
specified
polarization
voltage.
The
microphone
is
adjusted
so
that
its
frequency
response
characte-
ristic
is
as
flat
as
possible
for
zero
angle
of
incidence.
The
fre-
quency
range
is
from
20
c/s
to
16.ooo
c/s,
of
which
the
range
30
c/s
to
10
kc/s
is
linear
to
within
± 2
db.
The
f.i
rst
resonance
fre-
quency
is
about
11
kc/s.
When
a m i
crophone
is
placed
in
a
free
sound
f~~ld,
a
pressure
in-
crease
on
the
microphone
membrane
is
got,
co¢pared
with
the
sound

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