Installation drawing
INTRODUCTION -
Important Safety Information
Noise Reduction
The
JR-TH-01
acoustic hood was installed into the MIRA anechoic test chamber.
A calibrated sound source was positioned around the hood at the rear, left and
right faces at a distance of 0.7m from the face being assessed and at a height of
0.8m. A microphone was positioned inside the hood at a position consistent
with the location of the telephone. With the source operating, noise was
measured at the telephone position both with and without the hood in position.
The difference between these measurements, measured in octave bands, is the
insertion loss, i.e. the reduction in noise due to the effect of the kiosk. These
measurements were repeated for each source position. Insertion Loss Data
results are as follows:
(Measured using a 4kHz Octave Band dB)
Equipment included: Q1030 B&K Sound Source, Q25274 B& K Microphone,
Q22796 B&K Microphone, LMS Frontend, Q13432 Calibrator.
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