FED-STD-228A
SECTION 7
TEMPERATURE AND HUMIDITY OF CONDITIOINING ROOM
1. CONDITIONING
1.1 Standard atmosphere. Unless otherwise specified, all physical tests of wire and cable should be
made at a room temperature of 27° ± 5°C. (80° ± 9°F.) except in the case of dispute or disagreement
between laboratories. It is intended that the laboratory be maintained as closely as possible to 23°C. and
a relative humidity of 50 percent. The tolerances indicated are meant to cover variations from these
specified conditions which may occur at different locations in the room.
1.2 Dispute testing. In the case of dispute or disagreement between the laboratories, unless otherwise
specified, the specimen should be conditioned in an atmosphere of 50 ± 4 percent relative humidity and a
temperature of 23° ± 1°C. (73.5° ± 2°F).
1.3 Time of conditioning. Unless otherwise specified, the specimens should be conditioned for not less
than 3 hours before being tested and should be tested in the same atmosphere.
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