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4.
Appendrx
Influence of Vibration.
When acoustical tests are made on headphones,,
and
the 6
cm3
coupler is used,
care should be taken to
avoid vibration
of the artificial
ear.
The instrument
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Fig.
At.
Recording showing the influence of mechanical vibration.
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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Fig. A2. Vibration insulating of the set-up consisting of the Sound Level Meter
and tl1e Artificial Ear.
21
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