HD WME_1
HD WME_2

HD WME – Microphone Outdoor Protection

The HDWME microphone unit is suitable for long term outdoor monitoring, even
in a fixed unattended location. The unit is adequately protected from rain and
wind and the heated preamplifier provides stability of acoustic parameters over
time and allows to make measurements over a wide range of environmental
conditions.
The Delta Ohm sound level meter preamplifier matched with the outdoor
microphone unit is equipped with a circuit for electrical calibration of the

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Product Description

Applications
• Stationary and mobile noise control
• Long-term outdoor measurements
Features
• Microphone protection from wind and rain
• Stainless Anti-bird spikes
• Heated preamplifier
• Frequency response according to IEC 61672:2002-5 (and IEC 60651:2001-10)
and ANSI S1.4:1983, both for airport and community noise
• Compatible with standard ½” microphone sound calibrator
Description
The HDWME microphone unit is suitable for long term outdoor monitoring, even
in a fixed unattended location. The unit is adequately protected from rain and
wind and the heated preamplifier provides stability of acoustic parameters over
time and allows to make measurements over a wide range of environmental
conditions.
The Delta Ohm sound level meter preamplifier matched with the outdoor
microphone unit is equipped with a circuit for electrical calibration of the
preamplifier – microphone chain, a technique that uses a charge distribution.
The free field frequency response, meets the specifications of class 1 according
to IEC 61672 (and IEC60651) and was certified by I.N.RI.M. (Certificate of
conformity No. 10-0126-02 of 04.29.2010). The microphone unit HDWME
must always be positioned vertically to allow the anti-rain to perform its
function and can be used both to detect the noise at 0° and 90° directions.
The Delta Ohm sound level meters perform spectral corrections to the measures
to ensure tolerances in accordance with the IEC61672 class 1 in every situation.
The microphone unit HDWME provides an optimized frequency response
for “free field”. Since the microphone is installed in a vertical position, the
frequency response is flat for the sound waves coming from above, such as
those of aircraft overflights. To correct the HDWME frequency response for the
presence of the windscreen, the proper parameter of the sound level meter has
to be set as follows:
Menu >> Calibration >> Screen Correction >> WME.
The frequency response of the microphone to noise coming from the surrounding
ground is very different from that for “free field”. By setting the parameter:
Menu >> Calibration >> Microphone Response >> RI
the sound level meter applies the necessary spectral correction for measurements
of noise coming from the ground in accordance with specifications of class 1
according to IEC 61672 (and IEC 60651) and ANSI standards.
The easiness of disassembly and reassembly of the unit allows to perform
periodic testing of the electro- acoustic characteristics the same way as
a standard measurement microphone, using a standard calibrator for ½”
microphone.
When calibration is complete, refit the protections according to the explanations
under Assembly.
The unit consists of a central body and the following parts:
• HDSAV3: windscreen (3)
• HDWME1: birdspike (4)
• HDWME2: rainshield (2)
• HDWME3: stainless steel holder (1)
Microphone capsule:
• UC52: ½” free field type 2 condenser microphone, prepolarized (0V) for
HD2010UC and HD2010UC/A class 2
• UC52/1: ½” free field type 1 condenser microphone, prepolarized (0V) for
HD2010UC and HD2010UC/A class 1
• MC21E: ½” free field type 1 condenser microphone, prepolarized (0V) for
HD2110L
Microphone preamplifier:
• HD2010PNE2W: heated preamplifier for pre-polarized microphones UC52
and UC52/1 with integrated extension cable L=5mt (10mt on request). For
HD2010UC and HD2010UC/A sound level meters.
• HD2110PEWL: heated preamplifier for pre-polarized microphones MC21E
with integrated extension cable L=5mt (10, 20, 50mt on request). For
HD2110L sound level meters.

Download

Manuals and Brochures here.  

HDWME.pdf

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