C.7. USING THE SA 277C OUTDOOR MICROPHONE KIT (CHANNEL 4)
The SA 277C outdoor microphone kit protects the preamplifier and
microphone from weather conditions. The use of the outdoor
microphone kit requires an extension cable between the instrument or
the monitoring station and the preamplifier. SA 277C 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 enables
the use of standard tripods or other user specific mountings.
As an option the user may use desiccator – Silica gel. Desiccator
absorbs moisture commonly contained in the air.
Note: SA 277C 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: Using SA 277C changes the frequency response
and measuring ranges of SVAN 977C. Please check the
below given specification.
Note: See SA 277C User Manual to learn how to assemble
and disassemble the outdoor microphone kit.
Depending on the measurement task SA 277C 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 277C 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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