4.2.1 Joint procurement.
Equipment or subsystems
procured by one DoD activity for multi-agency use shall comply with the
requirements of the user agencies.
4.2.2 Filtering (Navy only).
The use of
line-to-ground filters for EMI control shall be minimized. Such filters
establish low impedance paths for structure (common-mode) currents through
the ground plane and can be a major cause of interference in systems,
platforms, or installations because the currents can couple into other
equipment using the same ground plane. If such a filter must be employed,
the line-toground capacitance for each line shall not exceed 0.1 microfarads
(µF) for 60 Hertz (Hz) equipment or 0.02 µF for 400 Hz equipment. For
submarine DC-powered equipment and aircraft DC-powered equipment, the filter
capacitance from each line-to-ground at the user interface shall not exceed
0.075 µF/kW of connected load. For DC loads less than 0.5 kW, the filter
capacitance shall not exceed 0.03 µF. The filtering employed shall be fully
described in the equipment or subsystem technical manual and the
Electromagnetic Interference Control Procedures (EMICP) (See 6.3).
performance of an equipment or subsystem shall not be degraded, nor shall it
malfunction, when all of the units or devices in the equipment or subsystem
are operating together at their designed levels of efficiency or their
4.2.4 Non-Developmental Items (NDI).
accordance with the guidance provided by DoD SD-2, the requirements of this
standard shall be met when applicable and warranted by the intended
installation and platform requirements.
220.127.116.11 Commercial items.
18.104.22.168.1 Selected by
When it is demonstrated that a commercial item
selected by the contractor is responsible for equipment or subsystems
failing to meet the contractual EMI requirements, either
the commercial item shall be modified or replaced or interference
suppression measures shall be employed, so that the equipment or
subsystems meet the contractual EMI requirements.
22.214.171.124.2 Specified by procuring activity.
it is demonstrated by the contractor that a commercial item specified by
the procuring activity for use in an equipment or subsystem is responsible
for failure of the equipment or subsystem to meet its contractual EMI
requirements, the data indicating such failure shall be included in the
Electromagnetic Interference Test Report (EMITR) (See 6.3). No
modification or replacement shall be made unless authorized by the
126.96.36.199 Procurement of equipment or subsystems having
met other EMI requirements.
Procurement of equipment and
subsystems electrically and mechanically identical to those previously
procured by activities of DoD or other Federal agencies, or their
contractors, shall meet the EMI requirements and associated limits, as
applicable in the earlier procurement, unless otherwise specified by the
Command or agency concerned.
4.2.5 Government Furnished Equipment
When it is demonstrated by the contractor that a GFE
is responsible for failure of an equipment or subsystem to meet its
contractual EMI requirements, the data indicating such failure shall be
included in the EMITR. No modification shall be made unless authorized by
the procuring activity.
4.2.6 Switching transients.
transient emissions that result at the moment of operation of manually
actuated switching functions are exempt from the requirements of this
standard. Other transient type conditions, such as automatic sequencing
following initiation by a manual switching function, shall meet the
emissions requirements of this