DI-HFAC-81981
u. Identification of make and model of measurement and analysis instrumentation used,
including calibration instrumentation. Certificates of laboratory calibration shall be
included.
v. Details of instrument settings used during the testing (e.g., type of sampling window,
coupling, sampling frequency, sampling time, number of averages, averaging type, and
frequency resolution of the data, if appropriate.
w. Name and other information identifying individuals representing the procuring activity
who witnessed the test, including e-mail and phone number.
3.2. Drawings, photographs, and calculations. This section shall contain:
a. Identification and arrangement of major components and unit under test.
b. Make, model, load range, and natural frequency of resilient mounts used to support the
device under test.
c. Resilient mount location and orientation, including any sway braces; and overall wet
weight and center of gravity of the item undergoing testing with respect to a defined
reference position.
d. Calculated load on each resilient mount compared to specified load range of each mount;
and calculated natural frequency of each mount when experiencing the calculated load.
e. Drawing and dimensional description of the foundation and mounting structure used to
support the machinery and equipment item undergoing testing.
f. Arrangement and description of flexible hose assemblies and flexible duct connections
showing configuration, diameter, and lengths of flexible sections, and details of how the
weights of these were supported. Photos shall be included.
g. Arrangement of piping and fittings used to facilitate testing and details of how the
weights of these were supported.
h. Arrangement of electrical power leads coupled with arrangements of cables used with
instrumentation.
i. Location and orientation of each microphone relative to the envelope of the item under
test.
j. Locations and sizes of equipment air inlet and discharge openings and dimensions of any
attached ducts and plenums.
k. Location of acoustical center of sound source.
l. Acoustical environment (indoor). When testing indoors, the following shall be included:
(1) Location and orientation of test unit relative to floor, walls, ceiling, and contents of
test room.
(2) Test location (e.g., anechoic, reverberant); dimensions of the test environment (e.g.,
room, chamber); description of the physical treatment on walls, ceiling, and floor.
(3) Description of any exposed insulating materials installed on the walls, floor, and
ceiling including manufacturer, model number, thickness, density, and facing.
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