C.8. USING THE SA 277D OUTDOOR MICROPHONE KIT (CHANNEL 4)
The SA 277D outdoor microphone kit protects the instrument’s
preamplifier and microphone from weather conditions. Using an outdoor
microphone kit requires an extension cable between the instrument and
its preamplifier (SC 277).
SA 277D is made of lightweight materials and is easy to install on a
tripod. This solution is recommended for short term outdoor noise
measurements.
The outdoor microphone kit has ¾” screw on its bottom which allows
the use of standard tripods or other user specific mounts.
As an option the user may use desiccator – Silica gel. Desiccator
absorbs moisture commonly contained in the air.
Note: SA 277D should be connected to the Channel 4 of
SVAN 958A.
Note: Desiccator should be regenerated after some period
of use, when it changes colour to light grey, by drying it for
3 hours in a temperature of 150°C. Desiccator should be
inspected at least every 2 weeks, and more often when
used in conditions of high air humidity.
Note: See also SA 277D User Manual to learn how to
assemble and disassemble the outdoor microphone kit.
Note: Using SA 277D changes the frequency response
and measuring ranges of SVAN 958A. Please check the
below given specification.
Depending on the measurement task SA 277D can be used in two
operational modes:
1. With reference incidence angle 90 deg – so called
“Environment” 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 958A with the SA 277D outdoor
microphone kit is compensated by means of two digital filters which can
be set in the Microphone Correction screen (path: <Menu> / Input /
Channels Setup / Channel x / Microphone Correction):
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