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|  MIL-R-62197A(AT)
4.7.6 Coil characteristics.
4.7.6.1 Current. To determine conformance to 3.4.4.1, apply 18 vdc to the assembly at
the coil for a period of 2 + 1 second. Gradually lower the input voltage to zero and then
gradually increase it until the assembly operates. Upon operation (pull-in), the current shall be
between 2.5 and 3.6 mA dc. Lower the input voltage until the contacts return to the de-energized
position at which time the drop-out current shall be between .36 and 1.8 mA dc. The difference
between the pull-in and drop-out current shall be not less than .70 mA dc.
4.7.6.2 Voltage. To determine conformance to 3.4.4.2, apply 18.0 vdc to the assembly at
the coil and maintain it for one-half hour without interruption. At the conclusion of this time,
subject the assembly to the current test of 4.7.6.1.
4.7.7 DC resistance. To determine conformance to 3.4.5, subject the assembly to the dc
resistance test specified in MIL-STD-202, Method 303. The dc resistance of the coil shall be
2000 + 200 ohms.
4.7.8 Inductance. To determine conformance to 3.4.6, measure the coil inductance using
an impedance bridge or equivalent. Inductance shall not exceed 25 H when tested at 60 Hz.
4.7.9 Environmental conditions.
4.7.9.1 Temperature.
4.7.9.1.1 High-temperature. To determine conformance to 3.4.7.1, subject the assembly
to the high-temperature test specified in MIL-STD-810, method 501, procedure II, except storage
temperature of step 4 shall be 160F. At the conclusion of the storage temperature test, stabilize
the assembly at 145F and subject it to the performance tests of 4.7.3 thru 4.7.8. After testing,
return the assembly to room ambient temperature and subject it to the performance tests of 4.7.3
thru 4.7.8.
4.7.9.1.2 Low-temperature. To determine conformance to 3.4.7.1, subject the assembly
to the low temperature test specified in MIL-STD-810, method 502, procedure I. Maintain the
temperature at -65F for a period of not less than 12 hours. At the conclusion of this time,
stabilize the assembly at -25F and subject it to the performance tests of 4.7.3 thru 4.7.8. After
testing, return the assembly to room ambient temperature and subject it to the performance tests
of 4.7.3 thru 4.7.8.
4.7.9.2 Vibration. To determine conformance to 3.4.7.2, mount the assembly in any axis
shown in figure 2 and subject it to the vibration test specified in MIL-STD-810, method 514,
procedure VIII, except as follows:
a. Test level shall be the vibration curve shown in figure 1 conducted in a 145F
ambient environment. Time schedule shall be a total of 80 minutes per axis
(see figure 2), including 13-1/3 minutes dwell time at each resonance.
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