8
Chapter 3
Measuring Sound
Always calibrate your SONIK sound level meter prior to and after taking
measurements using a known sound source, such as the Castle GA607 Sound Level
Calibrator.
Incidence Angle
It is essential that you hold your SONIK sound level meter at the correct angle to the
noise source depending on the microphone type supplied with your meter.
The type of microphone supplied with your instrument will either be
Free Field
or
Pressure Field
, see below for details of the measuring incidence angle for each
microphone type: -
Pressure Field - (meeting ANSI Standards)
Pressure Field microphones required incidence angle of 90°, therefore whilst
measuring ensure your SONIK sound level meter is at 90° relative to the noise source
being measured.
Free Field - (meeting IEC Standards)
Free Field microphones require an incidence angle of 0°, therefore whilst measuring
always point your SONIK sound level meter directly towards the noise source being
measured.
To comply with legislation all SONIK sound level meters outside of the US
are supplied with a
Free Field
measurement microphone, and a
Pressure
Field
measurement microphone within the US
