 |
|||
|
|
|||
| ||||||||||
|
|  MIL-K-70493(AR)
0
0 . 5 F per foot in any direction. The heat source of the test
chamber shall be so located that radient heat, if used, will not
fall directly on the test item. Thermocouples or equivalent
temperature sensors utilized to determine or control the specified
chamber temperature shall be centrally located within the test
chamber within the supply airstream, or in the return airstream,
whichever provides the specified test condition at the item under
test and shall be baffled or otherwise protected against radiation
effects.
4.5.2.3.2 Fabrication, setup and calibration. Design and
fabrication of test equipment shall be such that it incorporates
the features of rigidity, stability, and ease of maintenance.
Setup and calibration equipment necessary for certification of the
testing equipment accuracy shall be furnished and will become a
part of the testing equipment. Operating and calibration
instruction shall be prepared and submitted to the procuring
activity.
4.6 Test methods and procedures. Unless otherwise specified
in the contract, the following procedures shall be utilized to
conduct specified tests. If the contractor chooses to use
alternate test procedures, a detailed description of he set-up and
procedure shall be submitted to the government procuring agency
for approval prior to use.
4.6.1 ESS temperature. Testing equipment utilized in this
test shall conform to the requirements of 4.5.2.3.1. The keyboard
shall be placed in the test chamber and the temperature of the
o
chamber reduced 10 C (18F) per minute plus or minus 1C
o
(1.08 F) from room ambient temperature (as specified in 3.3.1) to
0
-57 C (-71 F). The keyboard shall be maintained at this
temperature for a minimum of 20 minutes. Upon completion of the
200 minute exposure, the temperature of the chamber shall be raised
0
10 c (18 F) per minute plus or minus 1C (1.8C) to
O
0
+71 F (+160 C). The keyboard shall remain at this temperature
for a minimum of 20 minutes. Upon completion of the 20 minute
o
exposure the temperature of the chamber shall be reduced 10 C
0
0
0
(18 F) per minute plus or minus 1 C (1.8 F) to room ambient
temperature (as specified in 3.3.1). The above procedure shall be
conducted a minimum of ten times. Upon completion of the cycles
the keyboard shall then be removed from the chamber and subjected
to the tests in 4.6.3 and 4.6.5 inclusive. It shall meet the
requirements of 3.2.1.1 and 3.2.1.3 inclusive.
9
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals