NATO - AEP-4785
TESTING PROTOCOL ON ACOUSTIC SIGNATURE MEASUREMENT OF SMALL ARMS SUPPRESSORS
|Publication Date:||31 August 2016|
1. The following procedure is a balance between practicalities ('ease of use') and an acceptable level of error ('completeness').
2. The scope of this test procedure is to capture the pressure-time history from suppressed or unsuppressed small arms in the far field from which the following metrics can be determined:
a. ⅓ Octave Sound Exposure Level (LE(α));
b. Sound Exposure Level (LE(α)); 3. Both values are strongly dependent on the sound emission angle with respect to the bore axis of the weapon. How to derive these quantities mathematically is detailed in Annex A.
4. With these values you are able to determine the effects of adding a suppressor to a weapon, determine the signature of a small arm as measured in the far field and to assess the possible environmental impact from small arms firing noise.