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MIL-PRF-27 Transformers And Inductors \(Audio, Power, And High-Power Pulse\), General Specification ForThis specification covers the general requirements for power transformers, power inductors, audio transformers, audio inductors, high power pulse transformers, charging inductors, saturable transformers and saturable inductors for use in electronic and communication equipment. This specification covers transformers and inductors weighing 300 pounds or less or having root-mean-square \(rms\) test-voltage ratings 0f 50,000 volts or less, and also high-power pulse transformers where the peak pulse power is greater than 5 watts. Transformer and inductor assemblies incorporating any other active or passive components do not come within the scope of this specification.

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MIL-PRF-27G
TABLE VII. Group A inspection.
Inspection
Requirement
Method
paragraph
paragraph
Subgroup I (T level only)
Thermal shock screening
(when specified) (see 3.1) - - - - -
Burn-In  - - - - - - - - - - - - - - - - - - -
Seal (when applicable) - - - - - - - - -
Dielectric withstanding voltage 1/ -
Induced voltage - - - - - - - - - - - - -
Insulation resistance - - - - - - - - - -
Electrical characteristics 2/ - - - - -
DC resistance and resistive
unbalanced - - - - - - - - - - - - - -
---
Inductance and inductive
unbalanced - - - - - - - - - - - - - -
---
Center-tap balance at low levels
(-20 to -80 dbm balance) - - - -
---
Turns ratio - - - - - - - - - - - - - - - -
---
Polarity - - - - - - - - - - - - - - - - - -
---
No load - - - - - - - - - - - - - - - - - -
---
Radiographic inspection - - - - - - - - -
Visual and mechanical
(external) - - - - - - - - - - - - - - - -
Winding continuity - - - - - - - - - - -
Subgroup II (M level only)
Visual and mechanical examination
(external) - - - - - - - - - - - - - - - -
Seal (Grade 4) - - - - - - - - - - - - - -
Dielectric withstanding voltage 1/ - -
Induced voltage - - - - - - - - - - - - - -
Insulation resistance - - - - - - - - - -
Electrical characteristics 2/ - - - - -
DC resistance and resistive
unbalanced - - - - - - - - - - - - - -
---
Inductance and inductive
unbalanced - - - - - - - - - - - - - -
---
Center-tap balance at low levels
(-20 to -80 dbm balance) - - - -
---
Turns ratio - - - - - - - - - - - - - - - -
---
Polarity - - - - - - - - - - - - - - - - - -
---
No load - - - - - - - - - - - - - - - - - -
---
1/ The Government may witness this test prior to performance of group A inspection in which event 4.7.8.3 will
apply (see 6.6).
2/ As applicable (see 3.1).
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