TABLE I - SHIELDING EFFECTIVENESS TEST POINTS
Testing Location
Test Points Spacing
test point as single doors
WBC vents and panels
Test in center (on axis) for
all sizes (including single);
at all four corners if 12 inch
by 12 inch or larger; and at
the midpoint of each side longer
than 5 ft
At treated penetrations of
Test as close to "an-axis" as
shield (and entry panel and
possible, or orient for maximum
backshield)
signal
All other shield joints,
Sweep all surfaces at one
seams, or corners
MHz to 1 GHz. Test every 10 ft
max. plane wave
Doors
Door handles
EM filter enclosures
Test at each seam corner and
midpoint of each side longer
than 5 ft at center
EM cabinets and enclosures
Test at each seam corner and
each side 5 ft on center
NOTE 1.
Each point shall be swept in space 2 ft around the point.
3.7.5.2
Test Points
Additional test points shall be measured in accordance with
MIL-STD-188-125-1 for facilities requiring HEMP protection. Test points
include the periphery of doors and covers, handles, latches, power filter
penetrations, air vent filters, communications line filter penetrations,
and points of penetration by pipes, tubes, and bolts.
3.7.5.3
Test Methodology
Antennas shall be oriented for maximum signal pickup. Each test point
shall be probed for area of maximum leakage, such as around door frames,
accessible joints, filters, pipes, and air ducts. Magnitude and location
of maximum signal levels emanating from the enclosure shall be determined
for each accessible wall at a minimum of two locations on each wall, around
doors, and at penetrations and seams of the enclosure. Measurement of
attenuation shall be accomplished in accordance with Table I.
3.7.5.4
Test Frequencies
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NOTE: Test frequencies will be in accordance with
MIL-STD-188-125 when applicable.
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Testing frequencies for shielded enclosures shall be as follows:
SECTION 13095A
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