MIL-DTL-19648E
3.4.3 Terminals. The terminals shall be of the design specified (see 3.1 and 6.2.1).
3.4.3.1 Solder-lug terminals. Unless otherwise specified (see 3.1 and 6.2.1), solder-lug terminals used
for a 2-ampere rating or less shall be designed to allow the securing of two or more AWG No. 20 wires.
Terminals used for more than a 2-ampere rating shall be designed to allow the securing of three or more
wires, the size of which shall be as specified (see 3.1 and 6.2.1).
3.4.4 Adjustments. Relays having adjustable thermal settings shall be so designed that the setting of
any relay adjustment will not be altered by any tests specified herein.
3.4.5 Weight. Weight of the relay shall be as specified (see 3.1 and 6.2.1).
3.5 Solderability. When relays are tested as specified in 4.7.2, 95 percent of the total length of fillet,
which is between the standard wrap wire and the terminal, shall be tangent to the surface of the terminal
being tested. There shall be no pinholes, voids, etc. A ragged or interrupted line at the point of tangency
between the fillet and the terminal under test shall be considered a defect. After the test there shall be no
evidence of fracture, loosening of parts, or any other mechanical failure of relays.
3.6 Electrical characteristics.
3.6.1 Contact resistance or contact voltage drop. When tested as specified in 4.7.3.1, contact
resistance or contact voltage drop, shall meet the requirements of 3.6.1.1 and 3.6.1.2. All measurements
shall be taken from the outside of the header.
3.6.1.1 At rated load. Initial contact resistance and the resistance measured subsequent to any test,
with exception of life test, shall not exceed 0.050 ohm or equivalent contact voltage drop value; during
and after life test, resistance shall not exceed 0.150 ohm or equivalent contact voltage drop value.
3.6.1.2 At minimum current (0.100 ampere). Initial contact resistance and the resistance measured
subsequent to any test, with the exception of life test, shall not exceed 0.5 ohm or equivalent contact
voltage drop value; during and after life test, resistance shall not exceed 1.0 ohm or equivalent contact
voltage drop value.
3.6.2 Normal operate time (see 6.7.2). When relays are tested as specified in 4.7.3.2, normal operate
time shall be as specified (see 3.1 and 6.2.1).
3.6.2.1 Normal operate time tolerance (see 6.7.3). Relays shall meet the requirements of 3.6.2.1.1 or
3.6.2.1.2, as applicable.
3.6.2.1.1 During and after life test (except heater life). The timing change from the initial operate time
shall not exceed two times the specified normal operate time tolerance (see 3.1) during and after the tests
specified in 4.7.16.1 and 4.7.16.2.
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