User manual

231
Microphones
Outdoor Microphone M2230-WP
The M2230-WP is a weather-protected microphone solution for
the XL2 Sound Level Meter allowing acquisition of environmen-
tal noise data in outdoor applications. The corrosion-free polymer
housing, wind screen, water-repellent membrane and bird spike
provide excellent protection from rain, wind, dust and perching
birds. The frequency response of the M2230-WP fulfills the
class 1 requirements of IEC 61672 and ANSI S1.4 for vertical
sound incidence. Frequency compensation is employed in the
associated XL2 Sound Level Meter for compliance with hori-
zontal sound incidence. The M2230-WP consists of an M2230
measurement microphone enclosed in a WP30 weather pro-
tection kit.
Always activate the frequency correction •
filter in the XL2 when measuring a horizon-
tal sound incidence (sound source from the
side) with the M2230-WP. The filter ensures
that the measurements accuracy meets the
class 1 requirements of IEC 61672 and
ANSI S1.4.
Deactivate the filter only if you are measur-•
ing a vertical sound incidence (sound source
from above e.g. airplane noise).
Do not use the M2230-WP in a horizontal po-•
sition. Raindrops may reach and damage the
M2230 measurement microphone.
The outdoor windscreen is recommended to •
be replaced annually. The “WP30 Windscreen
Replacement” includes two spare wind-
screens, NTi Audio # 600 040 061.
The water-repellent membrane in the top sec-•
tion is mounted with two O-Rings. Inspect
these O-Rings and the membrane annually
for proper seating and good condition. Do not
touch the water-repellent membrane.
Alternatively the Measurement Microphone M2211 or M2215
can be fitted into the Weather Protection WP30. These micro-
phones have to be pushed further into the upper body by 3
mm. The top part of the capsule has to be 13 mm above the
upper body housing of the WP30. This is required because the
M2211 and M2215 capsule is 3 mm shorter than the default
M2230 microphone capsule.