TM 5-805-/AFJMAN 32-1090
Table 9-2. Sample Sound Power Level Specification.
1
The sound power levels for the (equipment in question) shall not exceed
the following values in the nine octave frequency bands:
Sound Power
Octave
Level
Band
(dB re 10-12 watt)
(Hz)
(Insert desired
31
values in blanks)
63
125
250
500
1000
2000
4000
8000
During the tests, the equipment shall be in normal operation at not less
than 50% full rated load (or at a specified mutually acceptable load
The tests shall be carried out by the equipment manufacturer
condition).
or by an approved testing agency, having proven capability in noise
measurernerds
and using approved measurement equipment and acceptable
measurement
Approved "standards" of measurements shall
procedures.
apply.
In lieu of the tests under Item 2 above, final testing for comformance
with the Item 1 noise levels may be made following complete installa-
tion of the equipment in the custmer's building, provided the equip-
ment manufacturer will remove and replace the equipment at his own
expense if it fails to meet the noise tests. To be acceptable, the
replacement equipment must meet the noise tests. For the on-site tests,
the equipment shall be in normal operation at not less than 50% full
rated load (or at a specified mutually acceptable load condition), and
the tests shall be in accordance with the procedures given in Item 2 above.
For all noise tests, the ambient sound levels of the test area shall be
at least 10 dB below the equipment sound levels, and the octave band
sound measurement equipment shall meet the applicable ANSI standards
for that type of equipment.
Sound pressure level readings (in decibels re 20 micropascals) and all
other data (including test room size and acoustic characteristics) used
in the determination of the sound power levels shall be submitted with
the bid.
9-4
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