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Appendix E: Noise Level Test Procedure |
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|  MIL-C-70725A (AR)
APPENDIX E
Noise Level Test Procedure
SCOPE
10.0
10.1 Scope. This appendix gives test procedures for
performing the Noise Level Test.
APPLICABLE DOCUMENTS
20.0
This section is not applicable to this appendix.
PURPOSE
30.0
30.1 Prupose. To compare the noise level of test
cartridges with the noise produced by control cartridges and to
measure-the noise level at-the gunner's head position.
40.0 EQUIPMENT
40.1 Equipment.
Equipment used in this test shall be
approved by the Government (see 6.2) prior to testing.
40.2 Weapons. Weapons shall conform to the dimensions
shown on the applicable drawings.
TEST PROCEDURES
50.0
The following
50.1 Pre-firing (preparation for test).
procedure shall be followed:
a. Test and control cartridges shall be loaded into
magazines, and conditioned at 70 2F for a minimum of four
hours.
b. The weapon shall be assembled in the test fixture
on the mount.
c. A noise level meter is set up outside the firing
room with a microphone placed inside the firing room.
d. A second microphone is placed at the right-handed
gunner's head position.
The first microphone shall be placed in such a
location in the firing room that the noise level produced by a
burst of control cartridges is within the range specified in the
requirement. This may entail firing more than one burst of
E-1
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