327913-000 Tyco Electronics, 327913-000 Datasheet - Page 38

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327913-000

Manufacturer Part Number
327913-000
Description
Connector Accessories Hexa Shield Adapter Aluminum Alloy Olive Drab
Manufacturer
Tyco Electronics
Type
Hexa Shield Adapterr
Datasheet
2-20
Step 3. Determine the
Level of EMI Shielding
Required.
Catalog 1654025
Revised 12-04
www.tycoelectronics.com
Dimensions are in millimeters
and inches unless otherwise
specified. Values in brackets
are U.S. equivalents.
Electrical Interconnection System Design
Integrated Military Harness Systems for Defense and Allied Industries
Tyco Electronics offer
several methods and
technologies for controlling
electromagnetic interfer-
ence (EMI) and noise in
cable harnesses. Developed
in response to well-estab-
lished threats in military and
other harsh environments,
these technologies can be
employed in compatible
shielding (screening)
systems to achieve the level
of shielding required for a
harness system. Table 5 on
page 2-22 outlines the
shielding requirements for
various types of threat and
levels of interference.
Introduction
This section is intended as a
guide for the use of harness
designers who are required
to achieve a level of EMI
control in their design prac-
tices. It is not intended that
it should be a definitive
statement on all aspects of
EMI control for harnesses.
In case of difficulty contact
us for further clarification or
consultancy.
For well-designed EMI
control of electrical systems
it is essential that a detailed
knowledge of the system
requirements and suscepti-
bility be obtained. The
chosen level of shielding
will be dependent on the:
I
I
I
I
I
Susceptibility of electrical
system.
Types of components
used.
Physical layout of the
system.
Equipment practices
adopted.
Anticipated EMI threat.
Dimensions are shown for
reference purposes only.
Specifications subject
to change.
For the most cost effective
design of harnesses, which
offer a long-term stability in
performance, the system
should be designed to
achieve a balance of com-
ponent characteristics.
Components should only
be used if they are qualified
to a minimum level of EMI
performance and the per-
formance and test method
should be applicable to
the design technique
being used.
For quality assurance
purposes minimum EMI
characteristics should
always be specified and
for critical harnesses the
complete performance
should be measured. The
technique to be adopted
should always be specified.
Finally the inter-relationship
between harnesses and the
protection, termination and
grounding of equipment
boxes is vital for good sys-
tem performance against
EMI. All components form
part of the external shield
on the system and therefore
should be considered in the
overall EMI design process.
Subjects covered in this
topic are:
I
I
Harness Types - point
to point and branched
Shielding Levels -
calculations
USA: 1-800-522-6752
Canada: 1-905-470-4425
Mexico: 01-800-733-8926
C. America: 52-55-5-729-0425
Harness Types
Harnesses are divided into
two types, point-to-point
and branched. The advan-
tages and disadvantages of
each from an EMI control
standpoint are described
below. No attempt has been
made to analyze their rela-
tive merits in mechanical or
installation terms.
Point To Point:
The three major compo-
nents of this type of harness
are: connectors, cable, and
connector accessories.
Connectors
There are many different
types of circular military
connectors. However, for a
well-shielded harness only
those connectors having a
guaranteed performance
level should be used e.g.
MIL-C-26482 Series II and
MIL-C-38999 series 1 and
2, and series 3 and 4.
Cable
Cable used in this type
of harness is generally
machine made. Hand laid
cables may also be used
but generally the shields
incorporated in these
harnesses vary in consis-
tency of performance. In
the case of machine made
cables all shields should be
designed for optimum
shielding effectiveness at
radio frequency.
South America: 55-11-3611-1514
Japan: 81-44-900-5102
Singapore: 65-4866-151
UK: 44-1793-528171
(Continued)

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