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Level Recorder
2305
1
I
I
I
I
,-----------.J
Regulating
Microphone
Enlarged
I
1
Heterodyne Analyzer
1
2010
<----+: . . . . . . . . . .
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L
~~~
171403
Fig.l.4. Set-up for recording the frequency response of a microphone probe
7.2.2. Frequency response of a B & K Minishaker Type 4810 at low levels
Fig. 7.5 shows a frequency response of a minishaker being driven by the
B.F.O. output of the 2010 at a low vibration level. Due to the amplitude
linearity of the B.F
.0.
output (± 0.2 dB over the whole range) it is not
necessary to compress the output signal with this particular set-up. However
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l...., lioo. f•oq.o_____Hr Yk Spee<l _ _ ... ,
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C-hogon
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-20 10
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10 5
R....lilo..:...
~1
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0
o
Qp
1124
10
20
Hr
50
Multiply
f•oqiiOOCy Scolo by
100
200
500
1000
2000
5000
10000
20000
40000 0 A B
C
lin.
Z....Lo..t
o
1612/2112
A B C lin.
Fig.7.5. Frequency response of a mini-shaker 4810 at low levels
dB dB
11-60
430
2
15
0 0
77
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