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SVAN 979 User Manual - Appendixes
C.7.
U
SING THE
SA 279
O
UTDOOR
M
ICROPHONE
P
ROTECTION
U
NIT
The
SA 279
outdoor protection unit protects the SVAN 979
preamplifier and microphone from weather conditions. The use of the
outdoor kit requires an extension cable between the instrument and its
preamplifier (
SC 279
). The SA 279 is made of lightweight materials
and is easy to install on a tripod. This solution is recommended for
short term and semi-permanent outdoor noise measurements.
The outdoor microphone kit has ¾” screw on its bottom which enables
the use of standard tripods or other user specific mountings.
As an option the user may use desiccator - Silikogel. The desiccator
absorbs moisture commonly contained in the air. The desiccator
should be regenerated after some period of use, when it changes
colour to red,
by drying it for 3 hours in a temperature of 150°C. The
colour of the silica gel is visible through the hole on the top of the
desiccator
Note: See also SA 279 Assembly Guide to learn how to
assemble and disassemble the microphone’s outdoor protection.
Note: Using SA 279 changes the frequency response and measurement ranges of SVAN 979.
Please check the below given specification.
Depending on the measurement task SA 279 can be used in two operational modes:
1. With reference incidence angle 90 deg
– so called “environmental mode”
2. With reference incidence angle 0 deg
– so called “airport mode”
The wave incidence angle is oriented to the microphone membrane surface. 0 deg means direction orthogonal
to the membrane surface. 90 deg means direction parallel to the membrane surface.
Frequency response of SVAN 979 with SA 279 outdoor protection unit is compensated by means of two digital
filters:
•
Environmental
compensation filter improving the complete instrument frequency
response in the free field for the reference acoustic wave
incidence angle 90 deg
•
Airport
compensation filter improving the complete instrument frequency
response in the free field for the reference acoustic wave
incidence angle 0 deg
Note: For the conformance of acoustical tests with SA 279, the Microphone Compensation must be
set to “SA279 (0
o
)” or “SA279 (90
o
)”! (path: <Menu> / Measurement / Compensation Filter).
Summary of Contents for SVAN 979
Page 272: ...272 SVAN 979 User Manual Appendixes 400 Hz 500 Hz 630 Hz 800 Hz 1000 Hz 1250 Hz ...
Page 273: ...273 SVAN 979 User Manual Appendixes 1600 Hz 2000 Hz 2240 Hz 2500 Hz 2800 Hz 3150 Hz ...
Page 274: ...274 SVAN 979 User Manual Appendixes 3550 Hz 4000 Hz 4500 Hz 5000 Hz 5600 Hz 6300 Hz ...
Page 275: ...275 SVAN 979 User Manual Appendixes 7100 Hz 8000 Hz 8500 Hz 9000 Hz 9500 Hz 10000 Hz ...
Page 312: ...312 SVAN 979 User Manual Appendixes Summary curve ...
Page 348: ...348 SVAN 979 User Manual Appendixes 250 Hz 315 Hz 400 Hz 500 Hz 630 Hz 800 Hz ...
Page 349: ...349 SVAN 979 User Manual Appendixes 1000 Hz 1250 Hz 1600 Hz 2000 Hz 2240 Hz 2500 Hz ...
Page 350: ...350 SVAN 979 User Manual Appendixes 2800 Hz 3150 Hz 3550 Hz 4000 Hz 4500 Hz 5000 Hz ...
Page 351: ...351 SVAN 979 User Manual Appendixes 5600 Hz 6300 Hz 7100 Hz 8000 Hz 8500 Hz 9000 Hz ...
Page 352: ...352 SVAN 979 User Manual Appendixes 9500 Hz 10000 Hz 10600 Hz 11200 Hz 11800 Hz 12500 Hz ...
Page 370: ...370 SVAN 979 User Manual Appendixes O ring gasket locations inside ...