4.1 Level linearity range
4.1 Level linearity range
The following table 4.2 contains the measurement ranges for A-weighted sound levels and the C-weighted
peak sound level for microphone sensitivity of 50 mV/Pa.
Fast/Slow/Leq in dB(A) L
AE
in dB(A) L
Cpeak
in dB(C)
25. . . 140 ab 30 37. . . 140
Table 4.2: Level linearity ranges for A-weighted sound levels and C peak
4.2 Linear operating ranges
The operating ranges given below are only valid for calibrated devices! The last columns show the starting
values for the level linearity tests.
f max in dB(A) min in dB(A) Range in dB(A) Starting values
16 Hz 84 30 54 74
31,5 Hz 100 30 70 84
1 kHz 139 25 114 94
4 kHz 140 30 110 94
8 kHz 139 30 109 94
12,5 kHz 135 30 105 94
Table 4.3: Linear operating ranges A-weighted (f is the frequency of the sine signal) and starting values for the level linearity tests.
f max in dB(C) min in dB(C) Range in dB(C) Starting values
16 Hz 126 41 85 94
31,5 Hz 137 42 95 94
1 kHz 139 39 100 94
4 kHz 139 38 101 94
8 kHz 137 39 98 94
12,5 kHz 133 38 95 94
Table 4.4: Linear operating ranges C-weighted (f is the frequency of the sine signal) and starting values for the level linearity tests.
4.3 Self-generated noise
The self-generated electrical noise of the device including preamplifier (measured with equivalent capaci-
tance and 50Ω at the input) amounts to approx. 16 dB(A) on the display. The acoustic noise is 16 dB. This
is a total noise level of 19 dB. The highest noise level may be expected when externally powered.
4.3.1 Measurement of low noise levels
For the measurement of low noise levels not special preparation is required.
ATTENTION! Legally binding measurements must not be performed, if the device is con-
nected to public power supply.
SINUS Messtechnik GmbH 23 of 30 Manual Tango_Plus
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