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163757
Fig. A3. Recording showing the influence of vibration insulating of the set-up
as shown
in
Fig. A2.
of the listener, may be difficult to
measure.
The headphone may act as an
"accelerometer"~
and great care should be taken to avoid this. One way to
overcome the problem may be to place the combination Sound Level Meter
Type 2203
+
Artificial Ear Type 4152 perpendicular to the direction of the
vibration on a piece of foam rubber
(see
Fig.
A2
and A3) or use a narrow
band filter. A selective measuring
set-up
for automatic recording is shown in
Fig. A4a.
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2112
AQ 0002
758
Fig. A4a. Set-up for selective measurement of the characteristic of an
earphone.
22
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