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|  MIL-R-5757H
4.6.13 Terminal strength (see 3.15). Relays shall be tested in accordance with method 211 of
MIL-STD-202 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 of
such design, size, and configuration, it shall be tested.
4.6.13.1 Pull test (all terminal types). Terminals shall be tested as specified in test condition A, the
force shall be as specified (see 3.1).
4.6.13.2 Bend test (not applicable to plug-in terminals). Terminals shall be tested as specified in test
condition letter B (two bends) or C, as applicable. Loads for test condition letter C shall be as specified
(see 3.1).
4.6.13.3. Bend test (plug-in terminals of a standard octal base only). The lesser of five or all terminals
shall be tested by applying a force of five pounds perpendicular to the axis of the pin within .125 inch
(3.17 mm) of the tip of the pin.
4.6.13.4 Twist test (wire lead terminals only). All terminals shall be tested as specified in 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 .75
inch (19.0 mm) from the point of emergence from the relay, or terminal end for relays with terminals less
than .75 inch (19.0 mm), and in one plane shall be bent 20 degrees 5 degrees in one direction, then
returned to start; bent in opposite direction 20 degrees 5 degrees, then returned to start. This procedure
shall then be repeated in the perpendicular plane. Following these tests, relays shall be examined for
evidence of loosening or breaking of the terminals and other damage that could adversely affect the
normal operation of the relay.
4.6.14 Magnetic interference (when specified; see 3.1 and 3.16). Relays shall be tested in accordance
with 4.6.14.1 or 4.6.14.2, as specified.
4.6.14.1 Uniform-stray-field. The relay shall be mounted by suitable nonmagnetic means within the
central volume of the test coil. The critical axis of the relay shall be aligned with the longitudinal axis of
the test coil. Pickup, hold, and dropout voltage (or current) shall be measured as specified in 4.6.8.2 in
0 magnetic field and in 100 gauss magnetic field of both polarities.
4.6.14.2 Adjacent-similar-relay. The relay under test and eight similar relays shall be mounted in the
same physical orientation by nonmagnetic means, as shown on figure 8. Unless otherwise specified,
grid-spaced relays shall be mounted so that all terminals are positioned in the closest possible grid
pattern. The spacing between terminals and the tops of adjacent terminals shall be as shown on figure 8,
unless otherwise specified. Pickup, hold, and dropout voltage (or current) shall be measured on the relay
under test as specified in 4.6.8.2 with the coils of the eight outer relays energized at rated voltage (or
current) (the magnetic polarity of each relay shall be similarly oriented). The measurement shall be
repeated with the coils of the eight outer relays de-energized.
4.6.15 Contact sticking (reed relays only; see 3.1 and 3.17). Relays shall be energized for 96 hours
with 120 percent of rated voltage (or current) applied to the coil. No load shall be applied to the contacts.
At the end of this period, without physically disturbing the relay, the coil shall be de-energized and the
release time shall be measured as specified in 4.6.8.4. This test may be performed as a part of the coil
life test (see 4.6.16).
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