MIL-PRF-15305F
4.6.8 Resistance to soldering heat (see 3.11). Terminals to be used for soldered connections shall be tested in
accordance with method 210 of MIL-STD-202. The following details shall apply:
a.
Depth of immersion in molten solder: 0.25 inch from the nearest insulating material, or to ½ the exposed
length of the terminal, whichever point is closer to the insulating material.
b.
Test condition C.
c.
After the test and soon as the solder terminals have returned to room ambient temperature, the following
tests shall be made in the order shown:
(1) Visual: There shall be no evidence of solder reflow of internal connections as evidenced by solder
flowing from the body of the device.
(2) Thermal shock: As specified in 4.6.2a.
(3) Terminal strength: As specified in 4.6.9. There shall be no evidence of mechanical damage or
loosening of terminals.
(4) Electrical verification: Winding continuity shall be verified.
4.6.9 Terminal strength (see 3.12). Coils shall be tested as specified in 4.6.9.1 to 4.6.9.3.1, as applicable.
4.6.9.1 Pull.
4.6.9.1.1 All terminals. Each terminal shall be tested in accordance with method 211 of MIL-STD-202. The
following details shall apply:
a.
Test condition letter A.
b.
Applied force Unless otherwise specified (see 3.1), the applied force shall be 5 pounds.
4.6.9.2 Twist.
4.6.9.2.1 Solid wire lead terminals (axial and radial lead terminals, not printed circuit terminals). Each terminal
shall be tested in accordance with test condition D, method 211 of MIL-STD-202.
4.6.9.3 Torque.
4.6.9.3.1 All other terminals (excluding solid wire, axial, radial, and printed circuit terminals). All other terminals
shall be subjected to a torque of 0.25 pound-inch applied in alternating directions, in a manner tending to produce
rotation of the terminal.
4.6.10 Life test (see 3.13). Coils shall be tested in accordance with method 108 of MIL-STD-202. The following
details and exceptions shall apply:
a. Method of mounting -
1. Wire-lead terminal coils Supported by wire leads mounted by lightweight push-post terminals on
each side of the body. The effective length of each terminal shall be 0.50 inch minimum. The panel
racks or bread-boarding device shall be equipped with current sensing terminals. Coils shall be so
arranged that the temperature on any one coil shall not appreciably influence the temperature of
any other coil.
2. All other terminals Supported as specified (see 3.1). Coils shall be so arranged that the
temperature of any one coil shall not appreciably influence the temperature on any other coil.
b. Ambient test temperature and tolerances unless otherwise specified -
1. Phenolic core coils: 90 ±5°C.
2. Iron core coils: 90 ±5°C.
3. Ferrite core coils: 90 ±5°C.
4. Other core coils: As specified (see 3.1).
c. Operating conditions 100 percent rated cyclic loaded conditions (see 3.1), 1-1/2 hours on and ½ hour
off, for the applicable number of hours specified and at the ambient test temperatures. "On time" shall
be three-fourths of the total lapsed time.
d. Initial measurements Measurements of inductance, Q, dc resistance, and self-resonant frequency
shall be performed at room temperature prior to subjecting the coils to the specified test temperature.
These initial measurements shall be used as reference in determining degradation limits after
exposure of the test temperature after each of the specified test intervals.
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