MIL-PRF-21038F
4.6 Conformance inspection.
4.6.1 Inspection of product for delivery. For C level transformers, inspection of product for delivery shall
consist of group A inspection (for C level). For M level transformers, inspection of product for delivery shall
consist of group A inspection (for M level) and group B inspection. For T level, inspection of product for delivery
shall consist of group A inspection (for T level) and group B inspection.
4.6.1.1 Inspection lot. An inspection lot shall consist of all transformers of a specific PIN to a specification
sheet, produced under essentially the same conditions, and offered for inspection at one time.
TABLE I. Qualification inspection.
Inspection
Requirement paragraph
Method paragraph
Group I ( 8 samples)
Electrical tests
3.6
4.7.3
Dielectric withstanding voltage
3.7
4.7.4
Insulation resistance
3.8
4.7.5
Visual and mechanical
3.4, 3.21, 3.22
4.7.1
Resistance to soldering heat
3.9
4.7.6
Terminal strength
3.10
4.7.7
Winding continuity
3.11
4.7.8
Electrical characteristics
3.6
4.7.3
Group II (2 samples)
Temperature rise
3.20
4.7.17
Life
3.12
4.7.9
Insulation resistance
3.8
4.7.5
Dielectric withstanding voltage
3.7
4.7.4
(at atmospheric pressure)
Electrical characteristics
3.6
4.7.3
Group III (6 samples)
Vibration
3.13
4.7.10
Shock
3.14
4.7.11
Thermal shock
3.15
4.7.12
Moisture resistance
3.16
4.7.13
Electrical characteristics
3.6
4.7.3
Solderability (2 samples)
3.17
4.7.14
Resistance to solvents (3
3.18
4.7.15
samples)
Group IV (if required)
Fungus (1 sample or certification)
3.19
4.7.16
5
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