Table of Contents
Advertisement
a.
2513
2103
163750
b.
Fig. 1.3.
a) The Artificial Ear Type 4152, Cathode Follower Type 2613 and the Micro-
phone Amplifier Type 2603.
b) The Artificial Ear and the Sound Level Meter Type 2203.
It
consists of a housing, a standardized 18 mm ear mould substitute, and an
airtight screw seal. The housing is supplied with threads for mounting a
Microphone Cartridge 4132 in one end and for the screw seal in the other.
The screw seal is made airtight by means of a rubber ring, which is also used
as a lock arrangement for the nub of the earphones for hearing aids. The
18 mm ear mould substitute is made removable to allow other adaptors
to be used, if required, as shown on p. 18.
When the condenser microphone cartridge is screwed into the coupler the
effective volume (including the equivalent volume of the cartridge) is 2 cm3,
within the tolerances permitted by the standard.
To enable pressure equalization a capillary tube arrangement is included in
the coupler, as shown in Fig. 1.2 and 1.4.
If
desired the couplers can also be used screwed directly onto a condenser
Microphone as shown in
Fig.
1.5. Fig. 1.5 shows also the exact dimensions
5
Advertisement
Table of Contents
