MIL-PRF-27G
3.10.3 All other units. When the transformers and inductors are tested as specified in 4.7.8.3, there shall be no
continuous flow of air bubbles or leakage of compound from the body of the units.
3.11 Dielectric withstanding voltage. When the transformers and inductors are tested as specified in 4.7.9, there
shall be no evidence of arcing, flashover, breakdown of insulation, or damage.
3.12 Induced voltage. When the transformers and inductors are tested as specified in 4.7.10, there shall be no
evidence of continuous arcing or breakdown of insulation, nor shall there be any abrupt changes in the input current, or
Q, as applicable. This test is not applicable for single winding inductors for which no rated voltage is specified.
3.13 Insulation resistance. When measured as specified in 4.7.11, the minimum insulation resistance shall be one
of the following values, as specified in tables V, VI, and VII.
a.
10,000 megohms.
b.
1,000 megohms.
c.
7,500 megohms.
3.14 Electrical characteristics. When the transformers and inductors are tested as specified in 4.7.12, the
applicable electrical characteristics and tolerances shall be as specified (see 3.1).
3.15 Temperature rise. When the transformers and inductors are tested as specified in 4.7.13, 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.
3.16 Corona discharge (when specified, see 3.1). When the transformers and inductors are tested as outlined in
4.7.14 or as specified (see 3.1), the corona shall not exceed 1-inch peak-to-peak deflection as indicated on the
oscilloscope.
3.17 Salt atmosphere (corrosion) (grades 4 and 5, when specified, see 3.1). When the transformers and inductors
are tested as specified in 4.7.15, there shall be no evidence of corrosion as exhibited by any visible degradation of the
surfaces that can be attributed to flaking, pitting, blistering or otherwise loosened protective coating or metal surface.
3.18 Vibration. When the transformers and inductors are tested as specified in 4.7.16, there shall be no leakage of
filling material, no evidence of other physical damage such as cracks, bursting, or bulging of the case.
3.19 Shock. When the transformers and inductors are tested as specified in 4.7.17, there shall be no leakage
of filling material, no evidence of other physical damage such as cracks, bursting, or bulging of the case.
3.20 Winding continuity. When the transformers and inductors are tested as specified in 4.7.18, all windings shall
be electrically continuous.
3.21 Immersion (grades 4 and 5). When the transformers and inductors are tested as specified in 4.7.19, there
shall be no leakage of filling material, no evidence of other physical damage such as cracks, bursting, or bulging of the
case or corrosion affecting the mechanical or electrical operation.
3.22 Moisture resistance. When the transformers and inductors are tested as specified in 4.7.20, there shall be no
leakage of filling material, no evidence of other physical damage such as cracks, bursting, or bulging of the case or
corrosion affecting the mechanical or electrical operation.
3.23 Overload. When the transformers and inductors are tested as specified in 4.7.21, there shall be no leakage
of filling material, no evidence of other physical damage such as cracks, bursting, or bulging of the case.
3.24 Visual and mechanical examination (post test). When the transformers and inductors are examined as
specified in 4.7.1.1.1, not more than 10 percent of the surface shall have peeling, flaking, chipping, cracking, crazing,
or other impairment of the protective coating. There shall be no leakage of the filling material, no evidence of other
physical damage, such as cracks, bursting, or bulging of the case or corrosion affecting the mechanical or electrical
operation of the units.
3.25 Flammability (grade 5). When the transformers and inductors are tested as specified in 4.7.22, there shall be
no evidence of violent burning which results in an explosive-type fire, and the coating material used on the
transformers and inductors shall be self-extinguishing. A transformer or inductor shall not be considered to have failed,
in the event that it is consumed by the applied flame, unless dripping of flaming material or an expolsive-type flame has
occurred. A transformer or inductor shall be considered to have failed only if an explosion of dripping of flaming
material occurs, an explosive-type flame is produced, or if visible burning continues beyond the allowable duration of 3
minutes after removal of the applied flame. Material will be considered self-extinguishing if the following conditions are
met:
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