MIL-DTL-19648E
4.7.5.2 At reduced barometric pressure. Relays shall be tested as specified in 4.7.5.1a (1) and in
accordance with method 105 of MIL-STD-202. The following details shall apply:
a. Method of mounting - Normal mounting means.
b. Test-condition letter - D, unless otherwise specified (see 3.1 and 6.2.1).
c. Tests during subjection to reduced pressure - Same as 4.7.5.1 except test voltage shall be 350 ±10
volts, 60 Hz between all points as specified in 4.7.5.1a (2).
d. Leakage current shall be monitored.
4.7.6 Insulation resistance (see 3.9). The insulation resistance shall be measured in accordance with
method 302 of MIL-STD-202. The following details shall apply:
a. Test condition letter - A.
b. Points of measurement shall be:
1. Between heater terminals, commonly connected, and case.
2. Between each NO contact and case.
3. Between each movable or "common" contact (or NC contact) and case with heater deenergized.
4. Between all contact terminals, commonly connected and the heater terminals.
4.7.7 Terminal strength (see 3.10). The terminal strength shall be measured as specified in 4.7.7.1,
4.7.7.2, or 4.7.7.3, as applicable.
4.7.7.1 Solder terminals, 0.047 inch diameter or less. Each terminal shall be twisted 45 ±5 degrees
clockwise, 90 ±10 degrees counterclockwise, and then 45 ±5 degrees clockwise. The twisting force shall
be applied at the point where connections would normally be made. Following the twist test, the
applicable pull force specified in table VII shall be applied to each terminal at the point where connections
would normally be made. The pull shall be applied in any one direction 45 ±5 degrees from the normal
axis of the terminal for a period of 15 to 30 seconds. Terminals shall be returned to their normal position.
TABLE VII. Pull force.
Terminal diameter
Pull force
(inches)
(pounds)
0.035 - 0.047
5 ± 0.5
0.023 - 0.0349
3 ± 0.3
Less than 0.023
2 ± 0.2
4.7.7.2 Plug-in terminals, 0.047 inch diameter or less. Each terminal shall be bent 20 to 30 degrees in
both directions from the normal axis of the terminal in a given plane and after returning it to normal, the
terminal shall be bent 20 to 30 degrees in both directions perpendicular to the previous plane. The
terminals shall be returned to their normal positions. Following the bend test, the applicable pull force
specified in table VII shall be applied to each terminal for a period of 15 to 30 seconds.
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