MIL-DTL-28778A
TABLE III First article inspection (Continued)
Examination or test
Requirement
Method
paragraph
paragraph
Electrostatic Shielding
No load
Rated load
Temperature rise
Terminal strength
Oil leak
Insulation resistance
3.10
3.14
Winding continuity
Excitation current 2/
Core loss 2/
Impedance measurements 2/
Short circuit / 4/
Voltage impulse 3/ 4/
Excitation current 3/ 4/
Core loss 3/ 4/
Impedance measurements 3/ 4/
Visual and mechanical examination
(external)
1/ Test shall not be performed if the manufacture provides certification that all external
materials are fungus resistant.
2/ Initial reading
3/ Conditioning measurements (see 3.6.3.6)
4/ These tests to be performed 5 times
4.5 Conformance inspection
4.5.1 Conformance inspection. Quality conformance inspection shall be made on every
transformer offered for delivery. This inspection shall consist of the examinations and tests specified in table IV in the
order shown.
Table IV. Conformance inspection
Examination or test
Requirement
Method
paragraph
paragraph
Visual and mechanical examination
(external)
Dielectric withstanding voltage
Induced voltage
Insulation resistance
Electrical characteristics
DC resistance and resistive unbalance
Inductance and inductive unbalance
Center-tap balance at low levels
(-20 to 80 dBm balance)
Turns ratio
Polarity
Electrostatic shielding
No load
Rated load
Temperature rise
Terminal strength
Oil leak
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