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Multifunction Acoustic Calibrator Type 4226 – User Manual
Table 3.6
Expected changes in measured noise dose over a 10-minute period for IEC noise dose meters which record a
100% noise dose for 90 dB lasting 8 hours. Expected changes for all four settings of the Sound Level switch are
shown
SPL
Setting
31.5
5.23
94 Inv. A.
0.00
94
0.01
104
0.06
114
Table 3.7
Expected changes in measured noise dose over a 10-minute period for ANSI noise dose meters which record a
100% noise dose for 90 dB lasting 8 hours. Expected changes for all four settings of the Sound Level switch are
shown
SPL Setting
31.5
3.63
94 Inv. A.
0.02
94
0.06
104
0.25
114
3.10
Using the AC Output
The
socket provides the electrical equivalent of all the acoustic signals produced in the
AC Out
coupler with a 12.5 mV equivalent to 94 dB SPL. The one exception is that the test signals for
checking crest factor handling have a crest factor of 10 instead of 3. This is an important exception
since type 0, 1 and I measuring instruments are required to handle crest factors of up to 10, see
section 3.8.
When a plug is inserted in the
the AC output signal itself becomes the feedback signal in the compression loop.
The position of the
at all frequencies. Otherwise the signal will be affected by the frequency dependant adjustments
for the various types of microphones and sound fields, see section A.1.
63
125
250
5.23
5.23
5.23
0.01
0.13
0.72
0.13
1.28
7.22
1.26
12.8
72.2
63
125
250
3.63
3.63
3.63
0.10
0.39
1.10
0.38
1.56
4.40
1.54
6.23
17.6
socket, the coupler is isolated from the signal generator and
AC Out
switch must be set to Pressure to obtain a constant output level
Sound Field
Frequency (Hz)
500
1 k
2 k
5.23
5.23
5.23
2.50
5.23
6.90
25.0
52.3
69.0
250
523
690
Frequency (Hz)
500
1 k
2 k
3.63
3.63
3.63
2.33
3.63
4.28
9.31
14.5
17.1
37.2
58.0
68.5
4 k
8 k
12.5 k
5.23
5.23
5.23
6.59
4.06
1.94
65.9
40.6
19.4
659
406
194
4 k
8 k
12.5 k
3.63
3.63
3.63
4.17
3.11
2.00
16.7
12.5
8.00
66.7
49.8
32.0
16 k
5.23
1.14
11.4
114
16 k
3.63
1.45
5.81
23.3
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