28 Material - Ferrishield

Installation Guidelines
FerriShield ® suppressors offer the finest performance alternatives by way of
universal packaging, specific-purpose and general-purpose formulations. There are
a few simple guidelines to assure expected results.
1. Cable Size
Refer to the chart on the page 33 for maximum recommended cable (or cable bundle)
diameter. More than one cable may be inserted through the core opening since each
circuit reacts with the ferrite material independently.
Consider the double loop knot shown in Attachment section below for snug attachment
while greatly increasing the attenuation effect due to the increased magnetic path
length. See also page 6, figures 3 and 4 for related technical information.
2. Closure
A tight fit between the cable outside dimensions; i.e. O.D., and the ferrite
inside dimensions, i.e. I.D., will create the most effective magnetic path and a
correspondingly higher attenuation ratio. Conversely, a loose fit is acceptable for
many reasons, principally if a larger ferrite is desired, or a purpose-fit slack cable
for tension control, flexing, etc.
3. Position
The suppressor should normally be located close to the cable termination where it
exits the electronic enclosure.
Where a cable connects two enclosures containing RF sources, a suppressor on
each end may be required.
For circuits within an enclosure, a position close to the RF source is best; however,
other locations along the circuit may work just as well. This provides the opportunity
to allow the suppressor, when affixed to the enclosure, to function also as a cable
routing guide. See “Attachment” below for alternatives.
4. Attachment
Consider the various attachment alternatives shown below.
For attenuation properties by frequency, see page 32
RF SOURCE
RF SOURCE
RF SOURCE
RF SOURCE
installation
Tight grip on cable Double loop knot Hardware: screw, rivet Press-fit tabs
Pressure sensitive adhesive Cable tie wrap Side-by-side double
loop for flat cables
35
OR
OR
AUXILIARY�
EQUIPMENT�
OR POWER�
SOURCE
RF SOURCE
ELECTRONIC ENCLOSURE