•
•
•
•
•
Conductive elastomers • Knitted wire mesh
Conductive coatings, sealants, adhesives
Cable shielding products • EMI/ESD shielding laminates
Shielded vents and windows
Commercial and military EMI testing
TECHNICAL
BULLETIN
LEADER IN EMI SHIELDING INNOVATION, DESIGN, AND TEST TECHNOLOGY
203
™
CHO-STRAP INSULATED GROUND STRAP
FEATURES
• Low RF impedance
• Passes all requirements of UL
specification 94V0*
• Reduces EMI radiated emissions
• Very flexible
• Simple installation
• Tinned contacts for corrosion resistance
• Flame retardant adhesive system
• High dielectric strength exterior
• Wide range of standard sizes
CHO-STRAP® grounding straps are flex-
ible, double-insulated laminates of copper
(inside) and polyester film (outside), with
punched and tinned ends to facilitate
termination. They provide low-impedance
ground paths at RF frequencies, thereby
reducing radiated EMI problems caused by
ordinary wire grounds. They are generally
more cost-effective than braided ground
straps.
These ground straps are recommended
wherever board-to-chassis or chassis-to-
cabinet grounding is required. Common
applications include:
• Tying a CRT driver board to chassis
(very low impedance ground required);
• Tying one sub-chassis to another;
• Tying a sub-chassis to main chassis
ground;
• Tying cabinet panels to chassis
ground.
Grounds made with ordinary wire (e.g.,
#18 copper wire) will have high impedance
at RF frequencies, and can actually act as
an antenna, thereby increasing radiated
emission levels. Braided ground straps are
costly and inconvenient because their ends
generally require tinning or hole punching
by the user, and they must often be insu-
lated to avoid shorting problems in tight
quarters.
CHO-STRAP ground straps are supplied
in a variety of standard widths and lengths
(see Table 1). Standard construction is
5-oz. rolled annealed copper, laminated on
both sides to 1-mil polyester film with a
flame retardant polyester adhesive. Ends
are punched with 0.187” dia. holes (4.75
mm dia.) for ease of installation with #10
screws. A 1/2” (12.7 mm) tinned area at
each end prevents oxidation of the
termination contact area.
®
TABLE 1 STANDARD CHO-STRAP SIZES
Part No.
Nominal Dimensions, inches (mm)
A
B
C
L-1011-3
L-1011-6
L-1011-9
L-1011-12
L-1011-15
L-1011-18
L-1012-3
L-1012-6
L-1012-9
L-1012-12
L-1012-15
L-1012-18
3.0
6.0
9.0
12.0
15.0
18.0
3.0
6.0
9.0
12.0
15.0
18.0
(76.2)
(152.4)
(228.6)
(304.8)
(381.0)
(457.2)
(76.2)
(152.4)
(228.6)
(304.8)
(381.0)
(457.2)
0.500
0.500
0.500
0.500
0.500
0.500
1.000
1.000
1.000
1.000
1.000
1.000
(12.7)
(12.7)
(12.7)
(12.7)
(12.7)
(12.7)
(25.4)
(25.4)
(25.4)
(25.4)
(25.4)
(25.4)
2.5
5.5
8.5
11.5
14.5
17.5
2.5
5.5
8.5
11.5
14.5
17.5
(63.5)
(139.7)
(215.9)
(292.1)
(368.3)
(444.5)
(63.5)
(139.7)
(215.9)
(292.1)
(368.3)
(444.5)
Other sizes available.
*Recognized under the Component Program of Underwriters Laboratories, Inc.
Chomerics,
Div. of Parker Hannifin
77 Dragon Court
Woburn, MA 01888-4014
Tel: 781-935-4850
FAX: 781-933-4318
www.chomerics.com
Parker Hannifin PLC
Chomerics Europe
Parkway, Globe Park
Marlow, Bucks, SL7 1YB, United Kingdom
Tel: (44) 1628 404000 FAX: (44) 1628 404090
France Freephone Tel: (0590) 8170
Germany Freephone Tel: (0130) 818074
Parker Hannifin Hong Kong Ltd.
Chomerics Sales Department
8/F King Yip Plaza
9 Cheung Yee Street, Cheung Sha Wan
Kowloon, Hong Kong
Tel: (852) 2428 8008
Fax: (852) 2480 4256
NOTICE: The information contained herein is to the best of our knowledge true and accurate. However, since the varied conditions of potential use are beyond our control, all recommendations or sugges-
tions are presented without guarantee or responsibility on our part and users should make their own tests to determine the suitability of our products in any specific situation.
This product is sold
without warranty either expressed or implied, of fitness for a particular purpose or otherwise, except that this product shall be of standard quality, and except to the extent otherwise stated
on Chomerics’ invoice, quotation, or order acknowledgement.
We disclaim any and all
liability incurred in connection with the use of information contained herein, or otherwise. All risks of such are assumed by the user. Furthermore, nothing contained herein shall be construed as a recom-
mendation to use any process or to manufacture or to use any product in conflict with existing or future patents covering any product or material or its use.
© Chomerics, div. of Parker Hannifin Corp., 1999
Printed in U.S.A.
1M599SG-200R
Rev.1-599
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