MIL-PRF-21038F
3.5 Screening (T level only). When transformers are tested as specified in 4.7.2, there shall be no leakage of
filling material, no cracking of encapsulating material; and no evidence of physical or mechanical damage
affecting the mechanical or electrical operation.
3.6 Electrical characteristics (including waveform parameters) (as specified see 3.1). When transformers are
tested as specified in 4.7.3, the applicable electrical characteristics shall be as specified.
3.7 Dielectric withstanding voltage. When transformers are tested as specified in 4.7.4, there shall be no
arcing, flashover, breakdown on insulation, or other evidence of damage.
3.8 Insulation resistance. When transformers are tested as specified in 4.7.5, the minimum insulation
resistance shall be 1,000 megohms.
3.9 Resistance to soldering heat. When transformers are tested as specified in 4.7.6, there shall be no
softening of insulation, loosening of the winding or terminals, or cracking of the devices.
3.10 Terminal strength. When transformers are tested as specified in 4.7.7, there shall be no evidence of
loosening, rupturing, or other mechanical damage. Bends shall not be considered as damage unless surface
cracking is evident. Except for flexible leads, there shall be no rotation of the terminals. Rotation of the external
portion of the metallic portion of a "hook" type terminal exceeding 10 degrees shall not constitute a failure.
3.11 Winding continuity. When transformers are tested as specified in 4.7.8, all windings shall be electrically
continuous.
3.12 Life. When transformers are tested as specified in 4.7.9, there shall be no evidence of physical or
electrical damage as indicated by an open circuit (a break in the continuity of any electrical circuit within the
transformer tested) or short circuit occurring within the transformer (such as shorted turns or faulty insulation
between layers, between turns, between windings, between winding and case or core, or between windings and
shield). In addition, transformers shall meet the following requirements:
a.
Insulation resistance ----------------------------------- Shall be as specified in 3.8.
b.
Dielectric withstanding voltage ----------------------- Shall be as specified in 3.7 (at atmospheric pressure)
The electrical characteristics shall remain within the tolerance or limits specified (see 3.1).
3.13 Vibration. When transformers are tested as specified in 4.7.10, there shall be no leakage of filling
material and no evidence of other physical damage affecting the mechanical or electrical operation.
3.14 Shock. When transformers are tested as specified in 4.7.11, there shall be no leakage of filling material
and no evidence of other physical damage affecting the mechanical or electrical operation.
3.15 Thermal shock. When transformers are tested as specified in 4.7.12, there shall be no leakage of filling
material; and no evidence of other physical damage affecting the mechanical or electrical operation.
3.16 Moisture resistance. When transformers are tested as specified in 4.7.13, there shall be no evidence of
physical damage or corrosion affecting the mechanical or electrical operation.
3.17 Solderability. When tested as specified in 4.7.14, transformers shall meet the applicable criteria for
terminal evaluation in the test method.
3.18 Resistance to solvents. When transformers are test as specified in 4.7.15, there shall be no evidence of
mechanical damage, corrosion, or other deterioration and the markings shall remain legible.
3.19 Fungus. All external materials shall be nonnutrient to fungus growth or shall be suitably treated to retard
fungus growth. The manufacturer shall certify that all external materials are fungus resistant or shall perform
the test specified in 4.7.16. There shall be no evidence of fungus growth on the external surfaces.
3.20 Temperature rise. When transformers are tested as specified in 4.7.17, the temperature rise of any
winding above the specified maximum ambient temperature (see 3.1) shall not exceed the value specified (see
3.1), and there shall be no evidence of physical damage.
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