Norsonic nor1217, Instruction Manual

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1 Norsonic Nor1217
Instruction Manual
1
Introduction
The outdoor microphone Nor1217 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 preamplifier Nor1209 and one
of the microphones Nor1225 or Nor1227.
Further, compared to a standard measurement micro-
phone, the Nor1217 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 Nor1217
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 Nor1217 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.
The preamplifier Nor1209 used in the Nor1217 kit is
equipped with the standard 7-pin Lemo connector for
microphone preamplifiers. For verification of proper
operation, the preamplifier is equipped with a system
check facility, where an electrical signal applied on one
of the terminals are returned after passing through the
complete signal chain, thus verifying proper operation
of the microphone cartridge, preamplifier and micro-
phone cable.
Nor1217 is mainly designed to be used with the Nor140
Sound Analyser. This instrument has the requested fre-
quency compensation and delivers the required current.