MIL-DTL-26126C
4.6.10 Acceleration (see 3.5.9). Relays shall be tested in accordance with method 212 of MIL-STD-
202. The following details and exceptions shall apply:
a. Mounting of specimens: By normal mounting means.
b. Test condition letter: A, except 3 g's when applied in the direction of the axis of the
plunger travel when initiating closing of the contacts, while the force applied through the
other direction in this axis shall be 15 g's.
c. A force of 15 g's shall be applied in both directions in the two remaining axes. The
acceleration required in each of the six directions shall be applied and removed three
times in succession without removing the coil voltage. The coil voltage shall be 3 V dc
below the relay pickup voltage.
d. Measurement after test: After the accelerating force has been removed and without
disconnecting the coil voltage, the time-voltage operation at 35 V shall be conducted.
The operating time shall fall within the limits specified on figure 1.
4.6.11 Shock (specified pulse) (see 3.5.10). Relays shall be tested in accordance with method 213 of
MIL-STD-202. The following details and exceptions shall apply:
a. Mounting method: Normal mounting means.
b. Test condition: A, except peak value shall be 10 g's.
c. Electrical load conditions: In each direction of shock, the relay shall be de-energized
during two shocks and energized with 29 V dc during two shocks.
d. Examinations after test: Dielectric withstanding voltage and calibration shall be as
specified in 4.6.2 and 4.6.3.
4.6.12 Fungus resistance (type I relays only, see 3.5.11). Relays shall be tested in accordance with
method 508 of MIL-STD-810. After the test, the relays shall meet the calibration (see 3.5.2) and dielectric
withstanding voltage requirements, except the dielectric withstanding voltage shall be 250 V rms, 60 Hz.
Following dielectric withstanding voltage, the relays shall be examined for fungus growth externally, and
with the case removed.
4.6.13 Stray magnetic fields (type I relays only, see 3.5.12). A 4-inch inside diameter loop, energized
to produce 600 ampere turns, shall be placed around the relay in any attitude or polarity while the relay is
energized with 2 V below the pickup voltage of the relay. Current shall be applied instantaneously, held for
10 seconds, then removed instantaneously. A circular coil with 20 to 200 turns may be used to produce
the required ampere turns.
4.6.14 Humidity (see 3.5.13). When tested as specified in method 103, test condition A, MIL-STD-
202, and after return to room temperature (25°C), the relays shall be tested for calibration as specified in
4.6.3. The relays shall then be dried in a circulating air oven at 75 ±2°C for 6 hours, then returned to room
temperature and tested for dielectric withstanding voltage and calibration as specified in 4.6.2 and 4.6.3.
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