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 MIL-HDBK-419A
7.5.2.3 Stray Capacitance.
A certain amount of stray capacitance is inherently present between the bonding jumper and the objects being
bonded as well as between the bonded objects themselves. Figure 7-13 shows an equivalent circuit for the
bonding strap alone.
represents the ac resistance of the strap;
is the inductance which may be calculated
with either Equation 7-2 or 7-3; and
is the stray capacitance between the jumper and the two members
being bonded. Except for extremely short straps, the magnitude of the inductive reactance of the strap will be
significantly larger than the resistance and, at frequencies above approximately 100 kHz, the
term can be
ignored. Thus, not considering
the equation for the magnitude of impedance,
of the equivalent circuit is
(7-4)
The equivalent circuit of Figure 7-13 does not take into account the effects of the equipment enclosure or
other objects being bonded. Figure 7-14 shows the true equivalent circuit of an indirectly bonded system. The
bonding strap parameters are again represented by
Figure 7-11. Relative Inductive Reactance versus Length-to-Width Ratio of Flat Straps (7-10)
7-23
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