G.R.A.S. AM0069 Windscreen for 1/2" Microphones

Outer diameter: 90 mm
Hole diameter: 12 mm
Material: Foam

Introduction

The AM0069 contains 5 spherical windscreens specially designed and optimized for use with 1/2" microphone sets for sound pressure measurements under free-field conditions, e.g. in situations where the wind comes from more and unpredictable directions. The windscreen is mounted by pushing it as far as possible over the microphone and preamplifier.

Design

When a microphone is placed in a laminar flow, turbulence is created which in turn results in unwanted pressure variations on the diaphragm. By using a windscreen the pressure variations are moved as far away from the diaphragm as possible.

Theoretically this supports a “the-bigger-the-better design”, but in practice it is a compromise between air speed reduction, practical size and self-induced noise. Self-induced noise is wobble-noise which is generated, when the windscreen starts moving around the microphone.

The G.R.A.S. windscreens are all size optimized and their special, open-cell foam structure and number of pores per inch2(ppi), are designed to resist a humid environment and at the same time not influence the sound pressure measurement result significantly.

Frequency dependent attenuation is to be expected if the windscreen gets wet. Therefore windscreens are not intended as rain protection of the microphone.

Alternatives

If longer duration of outdoor monitoring is required, we suggest that you look for the G.R.A.S. semi-permanent and permanent outdoor microphone solutions.

If the turbulence reduction is not sufficient for your type of measurement, we suggest the intensity measurement technique that suppresses background noise effectively. G.R.A.S. has a wide range of 2D, 3D and wide-frequency intensity probes supporting both CCP and LEMO input modules.

If you need to make sound pressure measurements in a well-defined laminar airflow, e.g. in a wind-tunnel, we suggest that you look for G.R.A.S. nosecones. Alternatively look for our surface microphones or our new flush-mounted microphone concept.

Quality & Warranty

G.R.A.S. accessories are made of stainless steel, alloys and high-quality composites. These items are covered by a 2 year warranty respecting their intended use.
On consumables like batteries, cables and windscreens we offer a 6 month warranty.