Svantek SV 200A, Руководство пользователя

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147 SV 200A User Manual
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 a BNC Class electrical input, the
microphone must be replaced by an electrical
microphone impedance ST 02 with the serial
capacitance 18 pF +/- 10%.
Note: For the conformance of electrical tests, the Microphone Compensation must be set to
“OFF”! (path: <Menu> / Measurement / Compensation Filter).
Note: For the conformance of acoustical tests, the Microphone Compensation must be set
to “On”! (path: <Menu> / Measurement / Compensation Filter).
Periodical test upper frequency 8 kHz
Linear Operating Range
Table C.1.1. Linear operating range: for the sinusoidal signal and microphone sensitivity 50 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)
fro
m
to
fro
m
to
fro
m
to
fro
m
to
fro
m
to
fro
m
to
fro
m
to from to
fro
m
to
31,5 Hz 25 90 25 113 25 127 30 130 25 90 25 113 25 127 28 93 50 130
500 Hz 25 126 25 129 25 130 30 130 25 126 25 129 25 130 28 129 50 133
1 kHz 25 130 25 130 25 130 30 130 25 130 25 130 25 130 28 133 50 133
4 kHz 25 131 25 129 25 129 30 130 25 131 25 129 25 129 28 134 50 133
8 kHz 25 129 25 127 25 127 30 130 25 129 25 127 25 127 28 132 50 130
12.5
kHz
25 125 25 124 25 124 30 130 25 125 25 124 25 124 28 128 50 127
Note: For the 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:
𝑨
𝒏
= 𝟏𝟑𝟎 − 𝟐𝟎𝐥𝐨𝐠⁡(𝒏/√𝟐)
, where A is the upper limit for the sinusoidal signal.
Example: For the crest factor n = 10 the upper limit is A10 = 113 dB.
The starting point at which tests of level linearity shall begin is 114.0 dB.
Measuring frequency range of the acoustic pressure (-3 dB) 3,5
Hz ÷ 20 000 Hz.
Basic measurement error of the acoustic pressure < 0.7 dB (measured for the reference
conditions, see below).