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|  MIL-F-4 8673 (AR)
a. with. the FCC-FTS- setup in the humidity chamber in. ..!
.
`-'
accordance with paragraph 4.8.1.3.3. 1, and non-operating? close and
seal the humidity chamber .
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b. Dry the test item0 at a temperature of not less than 40 C
(104F) nor more than 50 C (122W) for not less than 2 hours.
o
c. Condition the test item at 250 + 5oC (770 + 9 F) and
50 percent relative humidity for 24 hours.
d. Take performance measurements as required on the equipment
test data sheets and record the applicable data.
Note: The test item may be readjusted or realigned as necessary to
conform to the equipment specification requirements. No further
realignment or readjustment shall be permitted throughout the test
period other than with accessible controls, external to the test
itemt employed for operation of the test item. If repairs,
replacement of parts, or adjustments other than by the accessible
external controls are made at any time prior to completion of the
measurements required at the end of the fifth cycle, all five of the
24-hour cycles shall be repeated; Repairs include any change to the
test item that is not made by use of the accessible "controls
external to the test item. The test item shall only be operated
when specified test measurements are being performed-
e. Subject the test item to five 24-hour cycles in accordance
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with Figure 5-3. A 24-hour cycle consists of 16 hours at 55 +_
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5 C (131 + 9 F) and approximately 8 hours at 300 + 5 C
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(860 + 9 F)includes transition times). The relatve humidity
shall-be maintained at 95 percent,or greater,at both
Eoach transition time between 300 + 50C (860 +
t0 mperatures.
e
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9 F) and 550 + 5 C (1310 + 9 F) shall be not greater than
1-1/2 hours. `The relative humidity during each transition need not
be controlled. Approximately 2 hours after stabilization during the
high temperature and low temperature portions of the first or second
cycle, a sampling of the atmosphere in the chamber shall be made to
determine that the conditions of temperature and relative humidity
are uniform throughout the chamber.
f. Take performance measurements as specified in the equipment
test data sheets during the second cycle at 550 +0 5oC (1310 +
90F) immediately prior to decreasing to 300 + 5 (860 +
9 F.).
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