2.9.5.4
Calibration and Recalibration
Calibrate test set up and signal each time power is turned off or set up is
moved. During test, Government representative or Government witness
reserves the right to verify the test signal.
Calibrate prior to each
test, and at the end of each test. Only the equipments, cables, antennas,
amplifiers, attenuators used for calibration of transmitters and receivers
respectively shall be used for testing. At the end of each day,
recalibrate if the dynamic range varies more than 3 dB compared to the
beginning of the calibration of each day. Retest all test points.
2.9.5.5
Inspection
In-plant quality control procedures shall be required to ensure that HEMP
shielded door shall provide required SA. Inspection efforts shall include:
a.
Measurement of all dimensions and spacings. Dimensions on
approved shop drawings shall be held to within allowable
tolerances.
b.
Inspection of material, construction methods, and finishes.
2.9.5.6
Independent Tester
Furnish testing by an independent tester who is regularly engaged in
performing SA tests conforming to the procedures contained in MIL-STD-285
and MIL-STD-188-125. Independent tester shall not offer advice or
suggestions to correct problem. Only HEMP shielded door manufacturer shall
offer suggestions or advice to correct problems. General Contractor shall
hire the independent tester.
2.9.6
ELECTROMAGNET (EM) SHIELDED DOOR TESTS
**************************************************************************
NOTE: The following tests are required for EM
shielded door only.
**************************************************************************
2.9.6.1
EM R.F. Seal Breaking Force
The shielded door shall be mounted in a horizontal position with the door
capable of opening downward and support the door frame rigidly. Energize
the EM coils. Load one corner of the shielded door, weights shall be
applied in an area not to exceed 0.2075 square meter 324 square inches,
opposite to hinged corner (not supported by hinges) by weights. With the
EM coils energized, the force required to break EM R.F. seal shall be not
less than 2003 N 450 pounds. Subject the same door leaf of each size to SA
due to residual magnetism, and SA due to inner and outer coil tests.
2.9.6.2
SA Due to Residual Magnetism (RM)
Perform in-factory tests for all test points to determine the SA due to
residual RM by disconnecting the power by unplugging/deenergizing the power
source, vice activating "Open Door Switch." Activating "Open Door Switch"
will reverse the polarity of EM resulting in reduced RM, hence, reduces the
force required to open the shielded door. Perform this test in the factory
in the installed position. The SA for each test point and for each
frequency, shall be not less than 50 percent to minimum required.
SECTION 13095N
Page 17
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