Svantek SVAN 979 - Page 259

259
SVAN 979 User Manual - Appendixes
Mounting for acoustical tests
The microphone must be mounted on the preamplifier.
Preamplifier can be connected with SVAN 979 in two ways:
• directly attached to the meter or
• with the SC 93/5 extension cable (with the microphone preamplifier holder mounted on tripod).
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 electrical conformance tests or the conformance tests with the acoustic coupler, all
compensation filters must be Off (path: <Menu> / Measurement / Compensation Filter).
Note: For the conformance of acoustical tests, the Free Field compensation filter should be switched
on and the Windscreen position must be Off (path: <Menu> / Measurement / Compensation Filter).
If the case of Windscreen testing the Windscreen position must be On.
Note: Installation of the SC 93 preamplifier extension cable is automatically detected by the
instrument. When SC 93 is installed the “case compensation” filter is switching off.
Periodical test upper frequency 8 kHz
Linear Operating Ranges
Two measurement ranges are available: “LOW” and "HIGH".
The starting point at which tests of level linearity shall begin is 94.0 dB for the frequencies specifies below.
Table C.1.1. Linear operating range: “LOW” 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)
from
to
from
to
from
to
from
to
from
to
from
to
from
to
from
to
from
to
31,5 Hz
22
80
22
103
22
117
38
120
22
80
22
103
22
117
25
83
50
120
500 Hz
22
116
22
119
22
120
38
120
22
116
22
119
22
120
25
119
50
123
1 kHz
22
120
22
120
22
120
38
120
22
120
22
120
22
120
25
123
50
123
4 kHz
22
121
22
119
22
119
38
120
22
121
22
119
22
119
25
124
50
122
8 kHz
22
119
22
117
22
117
38
120
22
119
22
117
22
117
25
122
50
120
12.5
kHz
22
115
22
114
22
114
38
120
22
115
22
114
22
114
25
118
50
117