3.5
FIELD QUALITY CONTROL
3.5.1
Tests
Shielded door manufacturer shall supervise and install HEMP shielded door
to ensure that HEMP shielded door and frame is installed without
misalignment or warpage that would degrade the performance of the HEMP
shielded door. The HEMP shielded door specialist shall be present to
witness field tests including retests to correct problems. Following tests
shall be performed on-site after HEMP shielded door is installed in
completed HEMP shield. Prior to performing repair, Contracting Officer
shall approve corrective, recommended, or adopted measures.
3.5.1.1
Final Acceptance Test
Government reserves the right to witness and field testing. Provide [30]
[_____] days advance notice for field testing within Continental United
States.
A [45] [_____] day notice is required for testing conducted
outside Continental United States. Engineering Service Center, Code 065,
will witness all tests and repair on the shielded door. Final acceptance
testing of HEMP shielded door shall be made at construction site as part of
acceptance test of HEMP protection system. HEMP shielded door manufacturer
can perform corrections and repairs necessary to bring HEMP shielded door
into compliance with MIL-STD-188-125, however, modification is prohibited.
a.
EM SA test: HEMP shielded door shall comply with the minimum
requirements of MIL-STD-188-125. Measurements for SA shall be
made at [6] [_____] test points required by MIL-STD-188-125 for
single leaf personnel HEMP shielded door, [9] [_____] test points
for double leaf HEMP shielded door, and all penetrations of
shielded door. Number of test points shall be scaled up
proportionately for larger HEMP shielded door. Locate test points
around periphery of HEMP shielded door and at center of astragal.
Perform testing in accordance with MIL-STD-188-125 and modified
(orient magnetic loop antenna co-axial or co-planar or cross
whichever gives least SA or maximum signal pick-up) MIL-STD-285.
b.
Test frequencies: Make magnetic field, electric field, and plane
wave measurements at the following 7 test frequencies.
(1) Magnetic field (low impedance): One frequency at 14 KHz, one
frequency at 100 KHz, one frequency at 1 MHz, and one frequency at
20 MHz.
(2)
Electric field (high impedance):
One frequency at 30 MHz.
(3) Plane wave (377 Ohm): One frequency at 100 KHz, one frequency
at 400 MHz, one frequency at 750 MHz, and one frequency at 1 GHz.
Sweep each test point 610 mm 2 feet around test point.
c.
Test methodology: Regardless of test methodology or procedure
used, orient antennas for maximum signal pickup or least SA.
Orient magnetic loop antennas for co-axial, co-planar, or cross
for maximum signal pick up or least SA. Orient horn antenna
vertically or horizontally for maximum signal pick up or least SA.
d.
Test instruments and equipment:
SECTION 13095N
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