S9407-AB-HBK-010 Datasheet, PDF (115/276 Pages) Glenair, Inc. – HANDBOOK OF SHIPBOARD ELECTROMAGNETIC SHIELDING PRACTICES

S9407-AB-HBK-010, Rev. 2
6.3 DEFINITIONS
NOTE: Figures 6-1 through 6-10, which are referenced throughout this section, are grouped at the
end of this section.
a. Susceptor - A cable that is susceptible to magnetic field radiation.
b. Radiator - A cable that produces magnetic field radiation.
c. Cable Designator - The cable designation as determined by this section. It consists of a
cable category or a cable category and group number.
d. Cable Category - Prefixes "R" and "S" are used to designate the various cable
categories in this section. Categories R1, R2, R3, and R9 are considered to be
radiators only. Categories R4 through R8 are considered to be radiators but may also
be susceptors. Categories S1 through S4 are considered to be susceptors only.
e. Group Number - In the "R" categories, the number following the category after a dash
identifying a family of cables having similar electrical characteristics. In the "S"
categories, the number following the category with a dash representing the group
voltage V₂ (dBV) which is determined by the equipment design performance sensitivity
V₁ (dBV) (see figure 6-5).
f. V₁ (dBV) - Equipment design performance sensitivity. This sensitivity will normally be
supplied by the equipment manufacturer, or it can be obtained from Government or
contractor furnished information. V₁ (dBV) is defined as the lowest input signal voltage
which will produce a zero dB signal-to-noise ratio within the operating bandwidth of the
equipment.
g. Passband - The frequency band used when determining V₁ (dBV), the equipment
design performance sensitivity.
h. Spacing Restriction - The cable-to-cable spacing available (in inches) due to physical
restrictions, if any, of the installation.
i. V₂ (dBV) - The group voltage in figure 6-5 that is determined by V₁ (dBV), the
equipment design performance sensitivity.
j. S (dB) - Shielding effectiveness provided by shielding conduit and given as a function of
frequency in figure 6-7.
k. V₃ (dBV) = V₁ (dBV) + S (dB) - A voltage directly related to the sum of the equipment
design performance sensitivity and the shielding effectiveness of the conduit, in
decibels.
l. Special Case - Any EMI problem, condition, or other situation whose resolution is
beyond the scope of instruction provided in this handbook is considered a "special
case." Recommended solutions to special case problems, along with the supporting
rationale, should be submitted to NAVSEA (see paragraph 6.2.2) or other NAVSEA-
designated authority for approval.
Reprinted without change
6-2