MIL-DTL-87104C
d.
Relative humidity: 20 to 80 percent.
4.3.1.2 Test condition tolerances. Unless otherwise specified, the maximum tolerances on test conditions shall be
as follows:
Temperature: ± 2°C.
a.
Altitude: ± 5 percent, in feet.
b.
Humidity: ± 2 percent relative.
c.
4.3.1.3 Stabilization of test conditions. When specified, temperature and altitude stabilization shall have been
achieved prior to the start of the operational portion of the test in accordance with the following definitions:
a.
Temperature stabilization: When the temperature of the chamber and the temperature of the test item do
not change by more than ± 2°C, nor does the temperature of the chamber and the temperature of the test
item differ by more than 3.5°C over a 10-minute period, the temperature shall be considered stabilized.
Altitude stabilization: When the altitude remains constant within ±5 percent of the specified value for 10
b.
minutes, the altitude shall be considered stabilized.
4.3.2 Temperature sensing devices. When it is required during the test program to measure and record the
temperature or associated temperature rise of the equipment, 2 thermocouples shall be used to measure ambient
conditions and a minimum of 3 thermocouples shall be used on the test sample. The temperature of the
thermocouples shall be recorded at the start and at the completion of the test period, at 5-minute intervals during the
test period, and at more frequent intervals if the temperature rise exceeds 3°C during any 5-minute period.
4.3.3 Air circulating devices. If fans or other devices for circulating air are required in any chamber used in the test
program, they shall be positively identified along with their exact position in relation to the test sample as depicted in
the sketch of the test configuration. Air shall not be blown directly on the test sample during testing.
4.3.4 Test equipment requirements.
a.
All of the equipment required to accomplish each different test shall be tabulated and described in a test
equipment list contained in each test procedure. All of this equipment shall be traceable to the National
Institute of Standards and Technology (NIST).
b.
The calibration cycle of the equipment used, and the accuracy of the equipment, shall be specified in each
test procedure.
The frequency measuring device shall have an accuracy of ± 0.2 percent or better.
c.
The power measuring or monitoring equipment shall have an accuracy of ± 5 percent or better.
d.
e.
The dimensional measuring instruments shall have an accuracy at least 5 times better than the specified
tolerance.
The insertion loss measuring equipment shall have an accuracy of ± 0.04 dB, or 2 percent of the specified
f.
insertion loss value, whichever is greater.
g.
When a mating connector-receptacle is required in a specified test, the mating interfaces shall meet, or
exceed, all the requirements specified for the item being tested.
h.
Unless otherwise specified herein, the mating adapters shall have a VSWR equal to or less than 1.04:1
over the design frequency range of the equipment being tested.
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