MIL-DTL-19648E
3.12 Shock. When relays are tested as specified in 4.7.9, there shall be no evidence of mechanical or
electrical damage, nor shall the test impair the normal operation of the relay. There shall be no closing of
open contacts or opening of closed contacts in excess of 10 microseconds. Following the shock test,
contact resistance (or contact voltage drop) and normal operate time tolerance shall be as specified in
3.6.1 and 3.6.2.1.2, respectively.
3.13 Centrifugal acceleration (when applicable, see 3.1 and 6.2.1). When tested as specified in 4.7.10,
relays shall meet the requirements of 3.13.1 or 3.13.2, as applicable (see 3.1 and 6.2.1).
3.13.1 Acceleration test 1. When relays are tested as specified in 4.7.10.1, normal operate time shall
be as specified (see 3.1), under the constant acceleration. After the test, normal operate time and normal
operate time tolerance shall be as specified (see 3.1 and 3.6.2.1.2).
3.13.2 Acceleration test 2. When relays are tested as specified in 4.7.10.2, NO contacts shall remain
open and NC contacts shall remain closed at all times during the test while the relay is not energized. NO
contacts shall remain closed and NC contacts shall remain open at all times while the relay is saturated at
rated heater input. After the test, normal operate time and normal operate time tolerance shall be as
specified (see 3.1 and 3.6.2.1.2).
3.14 Overvoltage. When relays are tested as specified in 4.7.11, relays shall not be damaged and
normal operate time shall be as specified (see 3.1). Following overvoltage test, normal operate time
tolerance and insulation resistance shall be as specified in 3.6.2.1.2 and 3.9, respectively.
3.15 Vibration. When tested as specified in 4.7.12 for the level specified (see 1.2.2.3, 3.1, and 6.2.1),
there shall be no contact chatter in excess of 10 microseconds at any time in either the stabilized
deenergized, or in the saturated condition. At rated heater input and at maximum vibration frequency (or
resonant frequency) (see 4.7.12.1, 4.7.12.2, and 4.7.12.3), the operate time at the first sign of chatter
shall be not less than 80 percent of normal operate time and the duration of the chatter shall be not more
than 25 percent of the normal time. Following the vibration test, the insulation resistance at room
temperature, contact resistance (or contact voltage drop), normal operate time tolerance and dielectric
withstanding voltage at sea level shall be as specified in 3.9, 3.6.1, 3.6.2.1.2 and 4.7.5.1 respectively.
3.16 Moisture resistance. When tested as specified in 4.7.13, relays shall show no evidence of
breaking, cracking, crazing, spalling, or loosening of terminals. Immediately after the tenth moisture-
resistance cycle, at a relative humidity of 90 to 95 percent and a temperature of 25°C, the insulation
resistance shall be at least 1 megohm. After the moisture-resistance test and after 24 hours conditioning
at room ambient temperature and humidity, the insulation resistance of the relays shall be at least 50
megohms and the contact resistance (or contact voltage drop) and normal operate time shall be as
specified (see 3.6.1 and 3.1). The relays shall have no corrosion of the case or terminals as a result of
the moisture-resistance test. Slight discoloration no longer than the diameter of the terminal is permitted
at the junction of the terminal and the header.
3.17 Overload. When tested as specified in 4.7.14, the contact resistance (or contact voltage drop)
following testing shall not exceed 0.100 ohm (or equivalent contact voltage drop value) and the normal
operate time shall be as specified (see 3.1).
3.18 Salt spray (corrosion). When tested as specified in 4.7.15, there shall be no evidence of
corrosion, no peeling, chipping, or blistering of the finish, nor exposure of base metal. Slight discoloration
no longer than the diameter of the terminal is permitted at the junction of the terminal and the header.
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