Measurements on Electric Shaver
Band
centre
frequency "
Hz
31
.5 63
125
250 500 1000 2000 4000
Band pressure
level (dB)
40 42 40
47 54
60
58
60
Loudness
index
0 0.16
0.37
1.
44
2.84 4.8 5.2 7.0
st
sm
+ F
(L
s-
Sm) = 17.5 +
0.3
X 21.8 = 24 sones
24 sones
--+
86
phons
8000
72
17
.5
Table 7.1. Example
of
conversion
of
the octave sound spectrum shown
in
Fig.7.15
into
Loudness Indices
and
calculation
of
the Loudness
Level
7.5. MEASUREMENT OF
MAXIMUM
ACCELERATION
Besides shock measurements
the
Peak Rectifier
of
the
2209
is
suitable
for measuring maximum acceleration. This
is
a valuable
quantity
in
the
investigation of fatigue.
The
resonance peak characteristic
of
the
acceler-
ometer requires a low-pass filter
to
be used (Fig.7.18).
'-
~
0 0
.
Accelerometer
,.-.-
...
".":
L
P-filter
.
""
___:_
2209
272066
Fig.7.18. Set-up
for
measuring maximum acceleration
104
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