Mounting options and measurement accuracy
Three mounting options for the
Ranos dB are available: pole mount,
tabletop and wall mount. The pole
mount and tabletop accessories are
shipped with the Ranos dB as stand
ard, the wall mount is optional. For
performing measurements conform
ing to the specifications, care needs
to be taken in the used mounting
method and placement of the
Ranos dB.
It would be most optimal if it was
possible to have the microphone
float on its own in free air. This is
obviously practically impossible.
To minimize the effect of reflections
and diffraction of nearby surfaces,
the nearby surfaces should be as
small as possible and should pref
erably be round(ed). The amplitude
of the reflected or diffracted sound
wave will also be decreased by
mounting the microphone as far away
from the nearby surfaces as possible.
Mounting the Ranos dB to a pole
with a diameter of 80mm or less, and
at a height of at least 3m is advised.
It is even better if the microphone
is mounted to the same pole, but
separately from the Ranos dB and
extended from the pole using the
microphone extension mount and
microphone extension cables. The
object the microphone is mounted
to should be free from mechanical
vibrations, as mechanical vibrations
might show in measurements at
lower levels.
In general, the following rules
of thumb should be used:
1.
Mount the Ranos dB at least
2m away from large flat reflective
surfaces, preferably more than
3 m. The more distance, the better.
2.
In case of tabletop or wall mount
use, the microphone will have to
be mounted separately at a dis
tance from objects and surfaces
using the microphone extension
mount and cables.
Example good mounting options:
•
Ranos dB mounted to a free
standing pole with a diameter
of less than 80 mm, at a height
of at least 2m from the ground.
Microphone mounted in standard
configuration, to the rear of the
Ranos dB.
•
Ranos dB mounted to a wall or
standing on a surface. Microphone
mounted separately to a nearby
free standing pole with a diameter
of less than 80 mm, at a distance
of at least 2 m from the ground
and walls, using a microphone
extension mount and microphone
extension cable.
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