MIL-DTL-3661D
3.4.11 Electromagnetic interference (see 3.2). When required, lens designed for electromagnetic
interference capability shall include an integral metal mesh. An electrical continuity shall exist between lens and
housing.
3.5 Performance.
3.5.1 Dielectric withstanding voltage. Lampholders, indicator lights, and indicator-light housings shall
withstand the voltage specified in 4.6.2 without arcing, flashover, or current flow in excess of 1 milliampere. The
item shall be electrically operative after the test.
3.5.2 Terminal strength. When lampholders, indicator lights, and indicator-light housings are tested as
specified in 4.6.3, there shall be no mechanical or electrical damage.
3.5.3 Solderability. Lampholders, indicator lights, and indicator-light housings shall be tested in
accordance with 4.6.4. The soldered area shall show at least 95 percent coverage after the application of the dip-
coated process.
3.5.4 Temperature cycling. When lampholders, indicator lights, indicator-light housings and lenses are
tested as specified in 4.6.5, there shall be no mechanical or electrical damage, as applicable. The lens shall show no
visual color degradation after the test.
3.5.5 Sand and dust. When specified (see 3.2), indicator lights shall be tested as specified in 4.6.6, there
shall be no evidence of any dust inside the lamp assembly. The item shall be electrically operative after the test. The
press-to-test unit shall be mechanically and electrically operative.
3.5.6 Circuit continuity. When indicator lights are tested as specified in 4.6.7, the indicator light continuity
shall conform to the applicable circuitry (see 3.2).
3.5.7 Contact resistance (not applicable to non-removable lens type indicator lights, or to lamp housings
with integral resistor).
3.5.7.1 Moving type contact. The contact resistance of lampholders, indicator lights and indicator-light
housings, employing spring-loaded contact assemblies, shall not be more than 1 ohm when tested as specified in
3.5.7.2 Static type contacts ( for cylindrical plug-in lamps). The contact resistance of static type
lampholders, indicator lights, and indicator-light housings shall not be more than 50 milliohms when tested as
3.5.8 Contact spring pressure (not applicable for non-removable lens type indicator lights). The contact
spring pressure for the following type lamps shall be within the specified range for the applicable type lamp socket
when tested as specified in 4.6.9.
(a) Single contact T-3-1/4, lamps, 24-72 ounces.
(b) Double contact candelabra bayonet base lamps, 48-144 ounces.
(c) Midget flange base lamps, 12-36 ounces.
(d) Submidget flange base lamps, 6-9 ounces.
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