Quantcast Shielding - hdbk419a_vol20333

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MIL-HDBK-419A
3.7.6 Bonding.
a.
Inspect all joints, seams, and connections to see that the mating surfaces were cleaned of corrosion,
nonconductive finishes, and dirt prior to joining (see Section 1.7.2). Check fasteners for tightness
combinations of dissimilar metals been avoided (see Section 1.7.3) or, where unavoidable, have appropriate
protective measures been applied (see Section 1.7.3 or Volume I, Section 7.7)?
b.
Do not permit sheet metal screws or Tinnerman nuts to be used for electrical bonding.
c.
Where used, do bonding jumpers generally conform to the recommendations contained in
Section 3.3.h.
d.
Check all bonds between subassemblies, equipments, and racks for conformance with
Sections 3.3.h-n.
e.
Inspect shield terminations for tight peripheral bonding to the connector shell. Such connections
should be firm, offer maximized contact between the shield and the shell, and should be formed in a way that
restricts the entrance of moisture and foreign matter into the bond area. Preferably bonds should be protected
with an adequate weather seal.
Pigtail terminations  should be inspected for tightness  a n d f o r e x c e s s i v e l e n g t h ( s e e
f.
Section 3.2.1.1.7). The pigtail should only be long enough to permit the connection to be made.
Complete Part IV of the Inspection Form.
g.
3.7.7 Shielding.
a.
Examine the construction and layout of the equipment carefully to see if the design guidelines
contained in Section 3.4 have been conscientiously considered.  Be particularly alert for obvious shielding
deficiencies such as poorly bonded seams; very high level (or very low level) circuits or devices with no shielding
applied; use of unshielded wire extending into or out of shielded area; unprotected meters, jacks and other
openings; unnecessarily large or unshielded ventilation ports; and the absence of gaskets or those which have
been poorly installed.
b.
Inspect gaskets for correct cleaning and preparation of the mounting and contacting surfaces.
Check the
gasket for firm and continuous contact with the mating surface upon closure. Does the gasket
appear to
offer sufficient resilience to withstand the repeated compression and release expected to be
associated
with the point where applied?  Is the gasket and mating surface adequately protected against
corrosion?
c.
Complete Part V of the Inspection Form.
3-49





 


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