MIL-STD-981C
TABLE XI. Group B tests for power transformers, power inductors, audio transformers, audio inductors,
high power pulse transformers, charging inductors, saturable transformers, and saturable inductors (families 03, 04, 20, 21, 36, 37 40 and 41 respectively) and low power pulse transformers (family 31) (see 5.6.7.4).
Test 1/ |
Class S |
|
Sample Size |
Defective units allowed |
|
Subgroup 1 Resistance to soldering heat 2/ Terminal strength 3/ Induced voltage 4/ 5/ Dielectric withstanding voltage 4/ (at atmospheric pressure) Electrical characteristics Visual and mechanical examination (external) Visual and mechanical examination (internal) (one sample unit) 6/ |
2 |
0 |
Subgroup 2 Solderability Resistance to solvents Vibration Shock Life 7/ Induced voltage 5/ 10/ Dielectric withstanding voltage (at reducedvoltage) Insulation resistance 8/ Electrical characteristics Visual and mechanical examination (external) Visual and mechanical examination (internal) (one sample unit) 6/ |
2 |
0 |
Subgroup 3 Corona discharge 9/ |
2 |
0 |
1/ Specified tests shall be performed in accordance with MIL-PRF-27, except tests for family 31 shall be performed in accordance with MIL-PRF-21038.
2/ Not applicable to self-leaded parts with lead lengths that meet a 4 inch minimum requirement with
26 gauge wire and smaller.
3/ Twist test is not applicable to self leaded parts.
4/ At maximum temperature for the class.
5/ Applicable when any winding has a rated voltage in excess of 25 volts rms.
6/ Real time x-ray is an acceptable method of examination in lieu of dissection or disassembly.
7/ Reduced life test, raise temperature one class for the duration of 500 hours total.
8/ At specified voltage with insulation resistance (IR) of 7,500 megohms minimum, except family 31 (IR)
will be at 750 megohms minimum.
9/ Applicable when materials stressed greater than 100 volts/mil due to maximum operating voltage.
Subject one sample each from subgroups 1 and 2 to this test.
10/ Reduce induced voltage 1.3X the rated voltage of the device.
NOTE: Induced voltage is not applicable to single winding inductors.
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