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1.
Description
The Hearing Aid Test Box Type 4217 consists of a miniature anechoic
enclosure with a built-in
loudspeaker
and a transistorized oscillator and
amplifier section. With the B
&
K Precision Sound Level Meter and l"
condenser microphone (pressure type) the set-up is complete and ready to
measure the various properties of hearing aids.
Cover for
built-in unit
Supports
for frame
Handle
Lid
Glasswool
__ Balancing
Springs
Fig. 1.1. Sectional view of the Hearing Aid Test Box Type 4217.
9
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