MIL-DTL-25879G
4.7.9 Insulation resistance (see 3.3.8). The insulation resistance shall be tested in accordance with method 302 of
MIL-STD-202, test condition C. The test voltage shall be applied to the center contact of each RF connector in turn
(with solenoids in both de-energized and energized positions). The insulation resistance shall be not less than 10
MegΩ.
4.7.10 Dielectric withstanding voltage (see 3.3.9). All current carrying portions of the switch shall be suitably
insulated for the intended purpose and shall withstand the application of 1,000 V rms, 60 Hz between switching
circuits (not mutually connected), circuits and coils, circuits and enclosure, and coils and enclosure. Each application
shall be conducted for one minute. There shall be no evidence of momentary or intermittent arcing or other indication
of breakdown, nor shall there be any visible evidence of breakdown.
4.7.11 RF power handling capability (see 3.3.10). Both output (antenna) terminals shall be terminated in 50 Ω
resistance loads. In a steady-state condition, the switch shall be capable of handling 100 W average power, at 2
MHz or higher frequency, for a minimum of 30 minutes in each switching position, with no appreciable heating or
increase in RF contact resistance. In addition, with applied RF power of 4.5 kW at 0.1 percent duty cycle at 1.250
GHz, the switch shall be operated at 140 operations per minute for at least 50 hours. The contact resistance shall not
exceed 0.025 Ω at 1 ampere at the end of the test (50 hours cumulative operation).
4.7.12 Internal RF contact resistance (see 3.3.11). Both output (antenna) terminals shall be terminated in 50 Ω
resistive loads. Apply 4.5 W average power at 240 MHz to the input terminal. The switch shall be operated at a rate
of 140 operations per minute, in such a sequence that the input never sees an open circuit, for a cumulative period of
10 hours. Acceptance shall be based on zero failures. Test limits are shown below:
Cumulative operating
RF contact resistance
time (hours)
Ohms (maximum)
.025 Ω at 1 A
First article testing
10
Acceptance testing
3 or 10
1/
1/ If after 3 hours of testing, the contact resistance is less than .010 Ω (at 1 A) for less than 10 percent of the
lot, the manufacturer may, at his option, terminate the test. However, if 10 percent or more of the lot fails to
meet the .010 Ω maximum limit at the end of 3 hours of testing, the testing shall be continued for the 10 hour
duration. If the manufacturer accepts the option, units having contact resistance of .010 Ω or greater will be
either rejected or tested for the 10 hour duration and shall meet the .025 Ω limit to be accepted.
4.7.13 Connector torque (see 3.3.12). Each connector shall be subjected to 45 foot-pounds of torque, the
procedure of which shall be prepared by the contractor and approved by the design activity (see 6.3). The switch
shall pass the immersion test after application of the torque test to each of the connectors.
4.7.14 Thermal shock (see 3.4.1). The switch shall be tested in accordance with method 107 of MIL-STD-202, test
condition A, except the minimum temperature shall be -40C. At the conclusion of the test, the switch shall be
removed from the test chamber; returned to standard temperatures; and within a period of one hour, operated and
tested. Switching time shall meet the original requirements.
4.7.15 Immersion (see 3.4.2). The switch shall be tested in accordance with method 104 of MIL-STD-202, test
condition B. The insulation resistance and dielectric withstanding voltage test measurements shall meet the original
requirements.
4.7.16 Shock (see 3.4.3). The switch shall be tested in accordance with method 213 of MIL-STD-202, test
condition J. The test pulse duration shall be 11 ms. After completion of the test, the VSWR and switching time shall
meet the original requirements. There shall be no visible evidence of loosening of parts.
4.7.17 Random vibration (see 3.4.4). The switch shall be tested in accordance with method 214 of MIL-STD-202,
test condition I, letter A. The test duration shall be specified as 1.5 hours. The switch contact continuity shall be
monitored in each position and shall show no evidence of discontinuity during the test.
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