MIL-DTL-28837C
4.7.17 Radiographic inspection (space flight mixers screening only). Mixers intended for space environment
application shall be examined in accordance with MIL-STD-202, method 209 (see 3.20). The following shall apply:
a. A known "good" comparison reference mixer shall be available for simultaneous exposure with the
device under test.
b. Two views shall be required, at 90° to each other, both perpendicular to the major (long) axis of the mixer.
c. Radiographs shall be examined under variable lighting conditions and magnification 1X to 7X for defects
d. Mixers x-rayed and found acceptable shall be identified with a blue dot, readily visible, not interfering with
other markings.
e. Serialization of mixers is required and must be correlated to film views. One film copy is required
shipped with the mixers. A report is required for each lot indicating the number of mixers inspected, the
number found acceptable, and the number rejected.
4.7.18 Acceleration (space flight mixers screening only). Mixers intended for space environment application shall
a. Mounting - Normal mounting means.
b. Test condition - B. The maximum acceleration test level shall correspond with levels experienced during
space environment applications (not less than 5, 000 g). Direction(s) of application shall correspond with
direction(s) of maximum susceptibility of internal mixer subcomponent flexure.
c. Measurements - Electrical functionality (see 4.7.4) shall be verified (as accepted by the acquiring activity)
before and after exposure to acceleration.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order
(see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these personnel
need to contact the responsible packaging activity to ascertain packaging requirements. Packaging requirements are
maintained by the Inventory Control Point's packaging activities within the Military Service or Defense Agency, or
within the military service's system commands. Packaging data retrieval is available from the managing Military
Department's or Defense Agency's automated packaging files, CD-ROM products, or by contacting the responsible
packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. Mixers covered by this specification are intended for use in military systems as balanced
mixers, phase detectors, balanced modulators, amplitude modulators, pulse modulators, and current controlled
attenuators.
6.2 Acquisition requirements. Acquisition documents must specify the following:
6.2.1 Mixers covered by specification sheets:
a. Title, number, and date of this specification.
b. Title, number, and date of the applicable specification sheet, and the military PIN (see 1.2).
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