Svantek SV 973, User Manual

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SVAN 973 User Manual
– Appendixes
164
Periodical test upper frequency 8 kHz
Linear Operating Ranges
Table C.7 Linear operating ranges for the sinusoidal signal and microphone sensitivity 1.8 mV/Pa
[dB]
L
AS/F
L
BS/F
L
CS/F
L
ZS/F
L
AeqT
L
BeqT
L
CeqT
L
AE
L
Cpeak
(t
int
= 2 s)
from to from to from to from to from to from to from to from to from to
31.5 Hz 50 98 55 121 55 135 70 138 50 98 55 121 55 135 53 101 83 138
500
Hz 50
134
55
137
55
138
70 138 50
134
55
137
55
138
53
137
83
141
1 kHz 50 138 55 138 55 138 70 138 50 138 55 138 55 138 53 141 83 141
4 kHz 50 139 55 137 55 137 70 138 50 139 55 137 55 137 53 142 83 140
8 kHz 50 137 55 135 55 135 70 138 50 137 55 135 55 135 53 140 83 138
12.5 kHz 50 133 55 132 55 132 70 138 50 133 55 132 55 132 53 136 83 135
Note: For signals with the crest factor n > 1.41 upper measuring range of the RMS (LEQ
and SPL) is reduced. The valid upper limit can be calculated according to the below given
formula:
𝑨𝒏 = 𝟏𝟑𝟖 − 𝟐𝟎𝒍𝒐𝒈(𝒏/√𝟐 )
, where A is the upper limit for the sinusoidal signal
Example: For the crest factor n = 10 the upper limit is A
10
= 121 dB
The starting point at which tests of level linearity shall begin 114.0 dB (94 dB for A filter @ 31.5 Hz).
Measuring frequency range of the acoustic pressure (-3 dB)
20 Hz ÷ 10 000 Hz.
Basic measurement error of the acoustic pressure < 0.7 dB (measured for the reference
conditions, see below).
Weighting filters (see part C.3)
Z according to IEC 61672-1:2013 for Class 2
A according to IEC 651 and IEC 61672-1:2013 for Class 2
B according to IEC 651 and IEC 61672-1:2013 for Class 2
C according to IEC 651 and IEC 61672-1:2013 for Class 2
Table C.8 Self-generated noise for different weighting filters
Electrical *) Acoustical compensated
Weighting filter A C Z A C Z
Noise < 40 dB < 40 dB < 50 dB < 43 dB < 48 dB < 63 dB
*) measured with the SL 973 microphone equivalent