MIL-DTL-19648E
4.7.3.5 Recovery time (when specified) (see 3.6.5).
4.7.3.5.1 Instant recovery time (see 6.7.9). When specified (see 3.1), start by measuring normal
operate time as specified in 4.7.3.2. Power to heater shall be cut off automatically (as for instant release
time) at instant when relay operates, and the relay shall be allowed to cool for the instant recovery time
permitted by the specification sheet. At end of this time, the heater shall be reenergized and recovery
operate time shall be measured. This shall be not less than 85 percent of normal operate time. Input
voltage to the heater shall be the same for both normal and recovery operate time.
4.7.3.5.2 Saturate recovery time (see 6.7.10). When specified (see 3.1), start by measuring normal
operate time as specified in 4.7.3.2. Excitation of heater shall be continued at rated voltage for 15 times
normal operate time plus 5 minutes. Heater power shall be cut off and the relay shall be allowed to cool
for saturate recovery time permitted by the specification sheet. At end of this time, the heater shall be
reenergized. The recovery operate time measured shall be not less than 85 percent of normal operate
time. Input voltage to the heater shall be the same for both normal and recovery operate time.
4.7.4 Seal (see 3.7). Relays shall be tested in accordance with method 112 of MIL-STD-202. The
following details shall apply:
4.7.4.1 Seal test I.
a. Test condition C.
b. Procedure I or III.
c. Degree of leakage rate sensitivity - See 3.7.1.
d. Measurements after test - Not applicable.
4.7.4.2 Seal test II.
a. Test condition B.
b. Measurements after test - Not applicable.
4.7.5 Dielectric withstanding voltage (see 3.8).
4.7.5.1 At atmospheric pressure. Relays shall be tested in accordance with method 301 of MIL-STD-
202. The following details shall apply:
a. Magnitude of test voltage, nature of potential and points of application.
(1) Sea level - 1,000 ±50 V rms, 60 Hz, between any switching circuits and heater, between any
switching circuits and case, and between heater and case. (For heaters or contacts rated at 115
V, 400 Hz, or above, this test voltage shall be 1,250 ±50 V rms, 60 Hz).
(2) Sea level - 500 ±10 V rms, 60 Hz between open contacts within all switching circuits in the
energized and unenergized positions.
b. Leakage current shall be monitored.
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