MIL-DTL-19648E
3.6.2.1.2 After heater life and other tests. The tolerance on normal operate time shall be increased by
50 percent of normal operate time tolerance (see 3.1) after exposure to any one of the following tests:
Acceleration
Thermal shock
Overvoltage
Shock
Vibration
Heater life
After the relay has been subjected to two or more of these tests, normal operate time tolerance shall be
increased to two times the normal operate time tolerance.
3.6.3 Minimum operate and minimum hold-in voltage (see 6.7.4 and 6.7.5). When tested as specified
in 4.7.3.3, relays shall operate in not more than four times normal operate time (see 3.1). After the relay
operates, normally open (NO) contacts shall remain closed and normally closed (NC) contacts shall
remain open. A slight hesitation at the moment of operation shall not be interpreted as releasing.
3.6.4 Release time (when specified). When relays are tested as specified in 4.7.3.4, the release time
shall be as specified (see 3.1).
3.6.5 Recovery time (when specified). When relays are tested as specified in 4.7.3.5, recovery time
shall be as specified (see 3.1).
3.7 Seal. When tested as specified in 4.7.4, sealed relays shall meet the requirements of 3.7.1 or
3.7.2, as applicable (see 3.1 and 6.2.1).
3.7.1 Seal test I (applicable to hermetically sealed relays). When relays are tested as specified in
4.7.4.1, there shall be no leakage in excess of 1x10-8 standard atmospheric cubic centimeters per second
3
(atm cm /s).
3.7.2 Seal test II (applicable to nonhermetically sealed relays). When relays are tested as specified in
4.7.4.2, there shall be no leakage.
3.8 Dielectric withstanding voltage. When relays are tested as specified in 4.7.5, there shall be no
evidence of arcing, flashover, or electrical breakdown; leakage current shall not exceed 1.0 milliampere.
3.9 Insulation resistance. When relays are tested as specified in 4.7.6, the insulation resistance
between insulated terminals and between any insulated terminals and case or frame shall be 100
megohms minimum.
3.10 Terminal strength (solder-lug and plug-in terminals). When relay terminals are tested as specified
in 4.7.7, there shall be no loosening or breakage of terminals, cracking or flaking of glass insulators other
than crazing or chipping of the glass meniscus, or any other damage. There shall be no deterioration of
relay performance beyond specified limits. After terminal strength test, hermetically sealed relays shall
meet the sealing requirements specified in 3.7.
3.11 Thermal shock. When relays are tested as specified in 4.7.8, normal operate time tolerance
before the test and during the high and low temperature tests shall be as specified (see 3.1). Following
the thermal shock test, normal operate time tolerance shall be as specified in 3.6.2.1.2.
5
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business