Svantek SV 971A, Руководство пользователя

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SV 971A User Manual
– Appendixes
208
Normal operating mode
SV 971A in configuration with the SV 18A microphone preamplifier and ACO 7152 microphone with following
settings: measurement range - Normal or Low (path: <Menu> / Measurement / Range
– see Chapter
4.6 ),
Microphone compensation - On , Field Compensation - Free Field , Windscreen compensation - Off (path:
<Menu> / Measurement / Compensation Filter
– see Chapter
4.7 ).
Conformance testing
This chapter contains the information needed to conduct conformance testing according to the specified
standards.
Mounting for acoustical tests The microphone must be mounted on the preamplifier.
Electrical substitute for the microphone To obtain an electrical input, the microphone must be
replaced by an microphone electrical equivalent impedance
ST 03 with 18 pF@100kOhm
± 10%.
Note: For acoustic conformance tests with the installed SA 22 windscreen, the Windscreen
compensation must be On.
Periodical test upper frequency
8 kHz
Linear operating ranges
Two measuring ranges are available: Normal and Low .
The starting point at which tests of level linearity shall begin is 94.0 dB for the frequencies specifies below. For
the
Low measurement range and A weighting linearity test at 31.5 Hz, the starting point is 79 dB.
Table C.1.1. Linear operating ranges for the Normal measurement range (for the sinusoidal signal and
microphone sensitivity 32 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 27 97 27 120 27 134 34 137 27 97 27 120 27 134 30 100 53 137
500
Hz 27
133
27
136
27
137
34
137
27
133
27
136
27
137
30
136
53
140
1 kHz 27 137 27 137 27 137 34 137 27 137 27 137 27 137 30 140 53 140
4 kHz 27 138 27 136 27 136 34 137 27 138 27 136 27 136 30 141 53 139
8 kHz 27 136 27 134 27 134 34 137 27 136 27 134 27 134 30 139 53 137
12.5 kHz 27 132 27 131 27 131 34 137 27 132 27 131 27 131 30 135 53 134