MIL-PRF-22684F
4.6.9 Resistance to soldering heat (see 3.14). Resistors shall be tested in accordance with method 210 of
MIL-STD-202. The following details shall apply:
a. Measurement before test: DC resistance shall be measured as specified in 4.6.2.
b. Test condition C: A board with a maximum area of 9 square inches shall be used, and the leads shall not be
cut. The parts shall be immersed to within .075 +.025 (1.91 ±0.64 mm) inch of the body.
c. Measurements after test: After completion of the cleaning process and following a minimum 3-hour cooling
period, the dc resistance shall be measured as specified in 4.6.2.
d. Examination after test:: Resistors shall be examined for evidence of mechanical damage.
4.6.10 Moisture resistance (see 3.15). Resistors shall be tested in accordance with method 106 of MIL-STD-202.
The following details and exception shall apply:
a. Mounting: Resistors shall be soldered by their leads to standoff insulators on a suitable panel so that there
will be at least 1 inch of free air space around each resistor. 1/ The spacing of the mounts shall be such that
the length of each resistor lead is .375 ±.063 inch when measured from the edge of the supporting terminal to
the resistor body. Resistor leads may be formed, if necessary, so as not to compromise the seal of the
resistor. In addition, one-half of the sample units shall be covered with a V-shaped metal strap whose width is
equal to the length of the resistor body as indicated on figure 2. The strap shall be made of a corrosion-
resistant metal and shall be kept in contact with the resistor body by supporting the body as indicated on
figure 2, with a nonconducting, noncorrosive support whose width is less than that of the body and which shall
not act as a moisture trap. The mounting straps may be individual for each resistor or continuous for all
resistors. These resistors with strapping shall be subjected to the polarization voltage.
FIGURE 2. Mounting straps for moisture-resistance test for polarized units only.
b. Initial measurement: Following thermal stabilization (within 30 minutes after resistors have been removed
from drying oven), dc resistance shall be measured as specified in 4.6.2.
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1/ Standoff insulators of polytetrafluoroethylene are preferred for use with resistors of high resistance values.
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