Norsonic nor1218, Instruction Manual

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1 Norsonic Nor1218
Instruction Manual
1
Introduction
The outdoor microphone Nor1218 is a measurement
microphone protection kit for all-weather conditions. It
is mainly intended for temporary outdoor applications.
The microphone contains elements for protecting the
microphone cartridge from rain, snow, dust and insects,
satisfying IP 55 requirements. The Protection kit is
designed for use with the IEPE preamplifier Nor1207
and one of the microphones Nor1227 or Nor1228.
Further, compared to a standard measurement micro-
phone, the Nor1218 improves the measurement accu-
racy by reducing the wind noise and by improving the
directional response for sound from different directions.
Combined with a suitable sound level meter including
a frequency response correcting function, the Nor1218
satisfy Class 1 specification requirements according to
IEC61672-1 and similar national standards for a sound
level meter class 1.
The microphone is intended for vertical mounting only
since the act of gravitation forms a part of the rain pro-
tection system. The reference direction may, however,
be selected to be vertical or horizontal based on the
applied frequency response compensation in the sound
level meter.
The outdoor microphone may be calibrated with a
normal sound calibrator suitable for ½” working stand-
ard microphones (WS2) and without the need for extra
accessories. Access to the microphone cartridge is
easily gained by dismounting the upper part of the
outdoor microphone.
The base of the Nor1218 is made of an electrical insulat-
ing material. The microphone body will be fully insulated
from the mounting mast thereby reducing pick-up of
electrical hum and noise.
Nor1218 is mainly designed to be used with the Nor131
and Nor139 Sound Level Meters. These instruments
have the requested frequency compensation and deliver
the required IEPE current.