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Use of Proiectlng t:over In the 6 cm3 Coupler.
To avoid damaging the diaphragm, when the 6 cm3 coupler is used, it is
recommended to use the microphone with the normal protecting
cover.
The coupler
volume
is then enlarged compared with the volume when the
microphone with the
adoptor
ring DB 0111 'is used,
and
the
acoustical effect
r-------------,.
r
-----------------------------------------------------
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ODODDOOOODDODOOOO
O
OOOOODOOODD:JlJ
O
OO
lrl~l••+~ts
a.e.~a.q.,
lro.la.ll-o
1o0o1a.r.,
0
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------
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z-,
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,
_ _ _
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- - -
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----
w.s.,.
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,-
00
==
:idB
OP 1123
10
100
1000
10000
l 10fi/21!1)A•
;
CU...
·
Fig. A5. Curves showing the effect of supplying the microphone with proctetion
cover when used in the NBS type 9
A
--
Coupler.
a) No protection cover on the microphone.
b) Microphone supplied with the normal B
&
K protection cover.
c) Microphone supplied with tire normal B
&
K protection cover and with vase-
line between protection cover and microphone.
of this arrangement is a change in impedance of approx. o.8 dB of the
coupler up to looo Hz,
and above
that frequency
,
the
curve
corresponds
within o.3 dB in the used frequency range to the curve recorded in agree
ment with the standard. The curves are shown in
Fig.
A5.
B&K Protection
The diaphragm
cover
~~~51
The gap
---
~========1J--The volume
-(6376
0
Fig. A6. Sectional view of the microphone
.
23
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