permanently-lubricated ball bearings at points of pivot and rotation.
The
door latches and hinges shall be rated for a minimum of 10,000 cycles
without loss of attenuation and without adjustments.]
[Nonlatching Type
**************************************************************************
NOTE: Nonlatching doors may be used for enclosures
having many daily open-close operations; however,
they may not retain as high an attenuation over the
long term compared with doors having three-point
latching mechanisms.
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The door shall be equipped with three heavy-duty ball bearing hinges and a
door pull. Door shall open and close with a force not to exceed 20 N 5
pounds.]
2.5
LINE FILTERS
2.5.1
Power Line Filters
Shall conform to the requirements of Section 16280N RADIO FREQUENCY
INTERFERENCE POWER LINE FILTERS and shall have current and voltage ratings
as [indicated] [specified].
2.5.2
Telephone and Signal Line Filters
MIL-F-15733. Filters shall have an
insertion loss of 100 decibels in the
frequency range of 14 kHz to 10 GHz
measured according to MIL-STD-220, full
load condition. Filters shall have
a pass band of [_____] kHz to [_____]
kHz with a characteristic impedance
of [_____] ohms.
2.6
WAVEGUIDE-TYPE AIR VENTS
Honeycomb-type air vents shall have cores fabricated of brass or steel, and
each guide shall be electrically and mechanically bonded to all adjacent
guides. Air vents shall be a permanent part of the shielded enclosure and
shall have a shielding effectiveness equal to that of the total enclosure.
Static pressure drop through the vents shall not exceed 5 Pa 0.02 inch
water gage at an air velocity of 3 m/s 600 feet per minute.
2.7
GROUNDING STUD
Enclosure shall have a permanently installed, solid brass or bronze
grounding stud complete with hardware and jamb nuts located in the entrance
plate [unless otherwise specified or indicated]. The stud shall be 13 mm
1/2 inch diameter double-threaded bolt which allows a full 50 mm 2 inch
running thread inside and outside of the shielded enclosure.
2.8
SERVICE ENTRANCE PLATES (SET-UP PANELS)
Shall be minimum 3 mm 1/8 inch thick steel, sized [300 by 300 mm] [12 by 12
inches] [_____] and shall have a 6 mm 1/4 inch extruded brass frame for
mounting to shielded enclosure wall panel.
2.9
NAMEPLATES
Major components of equipment shall have manufacturer's name, address,
SECTION 13093N
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