1.7
MAINTENANCE
1.7.1
Contents
In addition, the manual shall contain the following information:
a.
A complete set of assembly and disassembly drawings;
b.
A schedule of recommended maintenance and adjustment procedures to
ensure continuous shielding effectiveness;
c.
Allowable loads on top of room and on shelves mounted on walls,
including permissible weights of equipment that can be mounted on
walls; and
d.
Prescribed method of handling panels, cleaning of seams and
contact fingers, bonding jumpers, installing metallic items
penetrating the shielding material without decreasing the
attenuation characteristics.
PART 2
PRODUCTS
2.1
SHIELDED ENCLOSURE CHARACTERISTICS
2.1.1
Radio Frequency Interference Attenuation
The attenuation and shielding effectiveness requirements apply to the
finished shielded enclosure[s] and enclosure's components when all power
line filters are installed and carrying current, ventilation systems are
operating, [the coaxial connector panels capped,] and shielded door[s] are
in normal operation position. The specified shielded effectiveness shall
be achieved without using conductive tapes, gaskets, or cement materials.
Provide enclosure[s] having the following minimum magnetic, electric, and
plane wave attenuation:
Magnetic - [60] [_____] dB at 14kHz increasing linearly to [100]
[_____] dB at 200 kHz
Electric - [100] [_____] dB from 1.0 kHz to 50 MHz
Plane Wave - [100] [_____] dB between 50 MHz and 10 GHz
2.1.2
Sound Transmission Class (STC)
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NOTE: STC 30 provides only minimum sound
transmission loss. For greater sound control, more
detailed acoustical design requirements must be
incorporated into the specification.
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Provide enclosure[s] having an STC of [30] [_____] dB minimum when tested
according to ASTM E 90 [not including sound transmission loss of
surrounding building construction].
2.2
PANELS CONSTRUCTION
Flat steel sheet laminated to each side of a 20 mm 3/4 inch structural core
of either plywood or hardboard. [Panels shall have a flame spread rating
SECTION 13093N
Page 10
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