Appcndix; Influence Of Vibration - BRUEL & KJAER 4152 Instructions And Applications
Artificial ear for measurement on earphones as used in hearing aids and telephone communication systems. provided with couplers made in accordance with the leg recommendation 126, and various american and german standards.
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4.
Appendix
Influen«e of Vibration.
When acoustical tests are made on headphones,
and
the 6 cm
3
coupler is
used,
care should
be taken to avoid vibration of the
artificial ear.
The instrument
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100
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Fig.
Al.
Recording showing the influence
of
llIecllUnical
vibratioIl.
is
vibration and
shock
insulated by
means
of
three
soft
rubberfeet,
however,
large
vibration
may cause error in the measuring result.
See
Fig.
Al.
Especial.
ly
headphones
having a soft rubber ring, to provide a good fit to the head
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1022
Fig. A2. Vibration insulating of the set-up consisting of the Sound Level Meter
and the
Artificial
Ear.
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