MIL-DTL-28837C
3.13 Solderability (as applicable). When mixers with solderable connections are tested as specified in 4.7.10, the
terminals shall meet the criteria specified herein.
3.14 Resistance to solvents. When mixers are tested as specified in 4.7.11, there shall be no evidence of illegible
marking, mechanical damage, or deterioration of material or finishes.
3.15 Resistance to soldering heat (as applicable). When mixers with solderable terminals are tested as specified
in 4.7.12, there shall be no damage to the mixers or to the terminal insulators that will cause electrical failure, or
hermetically sealed mixers to leak. Chipping of terminal insulators above shall not be cause for failure unless the
chipping extends to the outer periphery. After the test, mixers shall meet the conversion loss and seal requirements.
3.16 Temperature extreme. When mixers are tested as specified in 4.7.13, there shall be no evidence of damage.
During this test, the mixers shall meet the conversion loss and isolation requirements.
3.17 Terminal strength. When mixers are tested as specified in 4.7.14, the terminal strength shall be no less than
the value specified.
3.18 Moisture resistance. When mixers are tested as specified in 4.7.15, there shall be no evidence of damage.
Upon completion of this test, mixers shall meet the conversion loss and isolation requirements.
3.19 Salt atmosphere (when specified) (see 3.1). When mixers are tested as specified in 4.7.16, there shall be no
evidence of warping, cracking, peeling, excessive corrosion, or in case of plated metals, corrosion that has passed
through the plating and exposed the base metal. Upon completion of this test, mixers shall meet the conversion loss
and isolation requirements.
3.20 Radiographic inspection (space flight mixers screening only). Components intended for space environment
application shall be subjected to and pass radiographic inspection (100% screening) in accordance with 4.7.17.
3.21 Acceleration (space flight mixers screening only). Components intended for space environment application
shall be subjected to and pass acceleration requirement (100% screening) in accordance with 4.7.18.
3.22 Marking. Mixers shall be marked in accordance with MIL-STD-1285 with the PIN and the manufacturer's
source code. Marking characters shall be approximately .125 inch (3.18 mm) in height. The marking shall be placed
on the identification plate, using a method that will provide legible and permanent marking for the life of the mixer.
The manufacturer's name or trademark may also be included in the marking provided such is not expressly forbidden
in the contract. When space does not permit use of an identification plate, marking may be directly on a flat or
circular cylindrical surface of the body. Letter size may be reduced to accommodate the following:
Preferred
M28837/
PIN
1-01S
ZZZZZ
M
Manufacturer's source code
Permissible
28837/
1-01S
ZZZZZ
3.22.1 Additional marking. In addition to any other special marking required by the contract (see 6.2), each unit
package, intermediate and exterior container, and unitized load must be marked in accordance with MIL-STD-129.
All unit packages fabricated with barrier material conforming to MIL-PRF-81705 type I must be marked with the term
"ES/EM shielded" in accordance with the special marking requirements of MIL-STD-129.
3.22.2 Serialization. When the contract requires that mixers be serialized, each mixer shall be marked with a
unique serial number assigned consecutively within the inspection lot, allowing traceability of the mixer. Space flight
mixers shall contain lot traceability on all parts from the time the lot is assembled to the time it is accepted.
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