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|  MIL-R-23016(Wep)
Test Conditions:
3.2.9.10
Ambient Interference Level:
3.2.9.10.1
It is desirable that the ambient interference level during testing,
measured with the test sample de-energized, be at least 6 db below
the allowable specified interference limit. However, in the event
that at the time of measurement the levels of ambient interference
plus test item interference are not above the specified limit,
the tested item shall be considered to have met the specified
requirements. This requirement shall apply equally to both radiated
and conducted ambient interference levels. A shielded enclosure
may be used if necessary or desired. If a shielded enclosure is
used, the minimum length shall be such that a 35-mc tuned dipole
can be placed in the room with at least 12 inches clearance
between the antenna extremities and the shielded enclosure.
3.2.9.10.2
Ground Plane:
A copper or brass ground plane, 0.01-inch thick minimum for
copper, 0.025-inch thick minimum for brass, 12 square feet or
more in area with a minimum width of 30 inches, shall be used.
In a screen room, the ground plane shall be bonded to the
shielded room at intervals no greater than 3 feet and at both ends
of the ground plane. The ground plane and screen room walls may
be considered equivalent to an aircraft fuselage for purposes of
simulating a normal installation. For large equipment systems
mounted on a metal test stand, the test stand may be considered,
for testing purposes, to be a part of the ground plane and shall
be bonded accordingly. When a shielded room is not used, the
measuring equipment may be placed on a solid support for operation.
The support may be solid earth, steel, or iron flooring, metal
bedplate, metal-covered planking, or the like.
Bonding:
3.2.9.10.3
Only the previsions included in the design of the equipment and
specified in the installation instructions shall be used to bond
units, such as equipment case and mount, together or to the
ground plane. Where bonding straps are required to complete the
test setup, they shall have a length not greater than 5 times the
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