MIL-PRF-15305F
e. Measurements during test Measurements of inductance , Q, dc resistance, and self-resonant
frequency shall be made after each of the following test intervals:
+ 48
+ 72
+ 48
+ 48
, 500
, 1000
, and 2000
hours. The coils shall be stabilized at room
250
-0
-0
-0
-0
temperature for a minimum of ½ hour after removal from the test chamber prior to taking
measurements. Coils shall remain at room temperature for no greater period of time than necessary
to perform the required measurements before return to test chamber.
f. Degradation limits Unless otherwise specified, coils shall not exceed the degradation limits specified
(see 3.1 and 6.7) for the 250 hour test interval and for succeeding test intervals up to and including
the 2000 hour test interval.
g. Examination after test Coils shall be examined for evidence of mechanical damage.
4.6.11 Low temperature storage (see 3.14).
4.6.11.1 Mounting. Coils shall be mounted by their normal mounting means (see 3.1), in such a manner that there
is at least 1 inch (25.4 mm) of free airspace around each coil, and in such a position with respect to the airstream that
the mounting offers substantially no obstruction to the flow of air across and around the coil.
4.6.11.2 Procedure. Coils shall be placed in a cold chamber at -63°C ±5°C. Ninety-six hours after the coils have
reached this temperature, the temperature of the chamber shall be gradually increased to room temperature within a
period of not more than 8 hours. Coils shall be examined for evidence of cracks or other mechanical damage.
4.6.12 Vibration (see 3.15). Coils shall be tested in accordance with 4.6.12.1 or 4.6.12.2. Unless otherwise
specified, high frequency vibration per 4.6.12.1 is applicable.
4.6.12.1 Vibration, high frequency. Coils shall be tested in accordance with method 204 of MIL-STD-202. The
following details shall apply:
a. Method of mounting The coils shall be securely fastened by their normal mounting means (see 3.1).
Units which are normally supported by their wire leads shall be mounted and soldered to
rigidly-supported terminals, so spaced that the length of each lead is .250 in from the coil body.
b. Test condition letter D (0.06-inch) double amplitude (maximum total excursion) or 20G, whichever is
less, with 10 through 2000 Hz frequency.
c. Measurement during vibration Each coil shall be monitored to determine electrical discontinuity by a
method which shall at least be sensitive enough to monitor or register, automatically, any electrical
discontinuity of 0..1 millisecond or greater duration.
e. Examination after vibration Coils shall be examined for evidence of physical or mechanical damage,
and winding continuity shall be tested as specified in 4.6.3.
4.6.12.2 Vibration, low frequency (when specified (see 3.1)). Coils shall be tested in accordance with method 201
of MIL-STD-202.The following details shall apply:
a. Method of mounting As specified in 4.6.12.1a.
b. Measurement during vibration As specified in 4.6.12.1c.
c. Examination after vibration As specified in 4.6.12.1d.
4.6.13 Shock (specified pulse) (see 3.16). Coils shall be tested in accordance with method 213 of MIL-STD-202.
The following details shall apply:
a. Method of mounting Coils shall be mounted in relation to the test equipment in such a manner that the
stress applied is in the direction which would be considered to be most detrimental. Cylindrical
insulated coils shall be soldered to rigidly-supported terminals, so spaced that the length of each is
0.25 inch from the coil body.
b. Test condition letter I.
c. Examination after test Coils shall be tested for winding continuity as specified in 4.6.3, and
examined for evidence of physical or mechanical damage.
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