327913-000 Tyco Electronics, 327913-000 Datasheet - Page 570

• Manufacturer Part Number: 327913-000
• Description: Connector Accessories Hexa Shield Adapter Aluminum Alloy Olive Drab
• Manufacturer: Tyco Electronics
• Type: Hexa Shield Adapterr

9-88
Catalog 1654025
Revised 12-04
www.tycoelectronics.com
Dimensions are in millimeters
and inches unless otherwise
specified. Values in brackets
are U.S. equivalents.
Miscellaneous
Electrical Shielding
Measuring Shielding
Efficiency
Surface Transfer Impedance (Zt)
To assess the effectiveness
of a shield, Tyco Electronics
has adopted the line injec-
tion method as described in
IEC 1196-1 to measure the
surface transfer impedance
(Zt) of a cable shield. This
relates the open circuit volt-
age generated on a compo-
nent wire inside the cable to
the current injected on the
overall shield. The unit of Zt
is Ohms per meter, thus the
voltage coupling is length
dependent and long cables
exhibit more leakage than
similar but shorter length
ones. To determine the sur-
face transfer impedance
across a range of frequen-
cies, a drive signal is gener-
ated by the internal tracking
generator of a spectrum
analyzer, and amplified. The
voltage is induced on the
center conductor of the
sample which is amplified
and returned to the signal
generator for measurement.
The understanding of leak-
age mechanisms has
enabled Tyco Electronics to
design Raychem cables
with guaranteed minimum
Zt values for the desired
operating environment.
Supershielding
EMP Hardened Cables
The requirements for
nuclear hardened cables
present the engineer with
a range of problems. The
waveform of the EMP is such
that the majority of power is
dissipated in a frequency
band between 1 KHz
and 5 MHz, where little
protection is given by con-
ventionally shielded cables.
Tyco Electronics has solved
this problem with a range of
Dimensions are shown for
reference purposes only.
Specifications subject
to change.
(Continued)
supershielded cables which
give shielding performance
at these frequencies by
incorporating materials
which change the induc-
tance of the shield and
lower the transfer imped-
ance. Raychem super-
shielded cables have a
sandwich construction of
Mu metal tapes between
optimized braids. Mu metal
is a ferro-magnetic material
which has a high perme-
ability over a wide range of
field strengths. It is applied
to the cable in a way which
maintains cable flexibility
and minimizes work harden-
ing and any consequent
reduction in permeability.
Supershielded cables not
only give protection against
EMP but also other major
interference modes.
Shielded Cables
Controlling the Threat
Testing
Tyco Electronics EMC test
facilities have the capability
for bulk current injection
and radiation field testing in
addition to surface transfer
impedance measurements.
The installation is a proven
facility in characterizing
new design parameters.
0.0001
0.001
0.01
100
0.1
10
1
10
USA: 1-800-522-6752
Canada: 1-905-470-4425
Mexico: 01-800-733-8926
C. America: 52-55-5-729-0425
3
of various types of screen constructions
10
4
Double
Superscreen
Screening performance
10
5
Frequency (Hz)
Aluminized
Mylar
10
6
Design and Manufacturing
Expertise
The problems of shielding
cables are complex.
However, with the introduc-
tion of optimized braids and
supershielded cables, Tyco
Electronics has the capabil-
ity to solve the most difficult
shielding problems.
Shielding of cables without
degrading cable flexibility
can be provided for coaxial
and multiconductor cables
for all EMC and EMP
conditions. To complement
this range of cables,
Tyco Electronics manufac-
tures Raychem cable
terminations and connector
back fittings to give total
interconnection system
shielding performance.
Single
Stranded Braid
South America: 55-11-3611-1514
Japan: 81-44-900-5102
Singapore: 65-4866-151
UK: 44-1793-528171
10
7
Solid
Copper screen
Single
Superscreen
Single
Optimized
Double
Optimized
10
55
65
75
85
95
105
115
125
135
145
155
165
175
8