MIL-PRF-28750F
4.7.11 Terminal strength (see 3.17). SSR's shall be tested in accordance with MIL-STD-202, method 211 in
accordance with the following, as applicable. Unless otherwise specified herein, two terminals of each discrete
design, size, and configuration shall be tested; however, if there is only one terminal of such design, size, and
configuration, it shall be tested.
4.7.11.1 Pull test (all terminal types). Terminals shall be tested as specified in MIL-STD-202, method 211, test
condition A. The force shall be as specified (see 3.1).
4.7.11.2 Bend test (not applicable to plug-in terminals). Terminals shall be tested as specified in MIL-STD-202,
method 211, test condition B (two bends) or test condition C, as applicable. Loads for test condition C shall be as
specified (see 3.1).
4.7.11.3 Twist test (wire-lead terminals only). All terminals shall be tested as specified in MIL-STD-202, method
211, test condition D, except during application of torsion, each terminal shall be rotated 45 degrees in one direction,
then returned to start; rotated in opposite direction 45 degrees, then returned to start. Each terminal shall be
subjected to two such rotations and returns. Each terminal shall be held at a point .25 inch from the point of
emergence from the SSR and in one plane shall be bent 20 degrees ±5 degrees in one direction, then returned to
start; rotated in opposite direction 20 degrees ±5 degrees, then returned to start. This procedure shall then be
repeated in the perpendicular plane. Following these tests, SSR's shall be examined for evidence of loosening or
breaking of the terminals and other damage that could adversely affect the normal operation of the SSR.
4.7.12 Moisture resistance (applicable to nonhermetically sealed SSR's only) (see 3.18). SSR's shall be tested in
accordance with MIL-STD-202, method 106. The following details and exceptions shall apply:
a.
Mounting: On a corrosion-resistant panel by normal mounting means.
b.
Initial measurement: Not applicable.
c.
Polarization: During steps 1 through 6, 100 volts shall be applied between the input (positive) and the case,
frame, or enclosure (negative), as applicable on one half of the sample SSR's. No polarization voltage shall
be applied to the other half of the sample SSR's.
d.
Final measurements: Upon completion of step 6 of the final cycle, insulation resistance shall be measured
as specified in 4.7.5. After a 24-hour drying period at a relative humidity of 50 percent ±5 percent, DWV
shall be measured as specified in 4.7.6, except the test voltage shall be 90 percent of initial potential.
e.
Examination after test: SSR's shall be examined for evidence of breaking, cracking, chipping, flaking of the
finish, or loosening of the terminals.
4.7.13 Crosstalk (when specified) (see 3.19). Crosstalk shall be measured using equipment which shall have an
input impedance of 1 megohm, minimum, and shall be paralleled with a capacitance of 20 picofarads maximum. A
1.0 to 10.0 volts peak-to-peak input signal at frequencies up to 10 megahertz shall be applied to the switching circuit
through coaxial cable, terminated in 50 ohms ±5 percent at the SSR terminal. The coaxial cable shall conform to MIL-
DTL-17. The input signal amplitude shall be measured at the terminals of the SSR. The terminals where crosstalk is
to be detected shall be connected through a similar type coaxial cable, terminated in 50 ohms ±5 percent at the
measuring SSR. The resultant attenuation, in decibels (dB), equals:
Log10Vin
20*
Vout
35
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