MIL-HDBK-773A
i. Perform continuity checks of all ground wires weekly (or as directed by manufacturer or command requirements) to ensure that the proper grounding is maintained. A log of grounding point system checks should be maintained for documenting when checks were performed. The log should be available for reviews by supervisors and Quality Assurance personnel. (See MIL-STD-1686 and ANSI/EIA 625).
J. Check wrist straps daily to ensure that the protective resistor (usually one megohm) is still in the circuit and that personnel are properly grounded. If the wrist strap resistance is less than 250K ohms, or indicates an open circuit, do not use it.
k. Antistatic pouches should be used for technical manuals, drawings, work instructions, etc., rather than plain plastic pouches, if they are used at all.
5.8 Typical ESD-controlled workstation. Figure 5 shows a typical ESD-controlled workstation (the heat-sealing equipment is not shown). Indicated on the figure are key ESD-control components that comprise a workstation. Figure 6 depicts several close-up examples of these components.
5.9 ESD workstation conductive material. The term "conductive" is often used in reference to ESD protective tabletops, floor mats, and chairs, but this term is a misnomer. They are not conductive as are common metals (for example, copper, aluminum, etc.),
but are classified between metal conductors and insulators of electricity such as ceramic, dry paper, and mica. The resistance characteristics of static dissipative table tops, floor mats, and chairs prevent the possibility of a spark discharge or high current flow. They allow an electrostatic charge to be safely dissipated across the surface to the ground.
5.10 ESD field service kit. ESD protection is required where formal workstations are not practical (that is, remote locations such as shelters and vans). ESD control field service kits provide the next most effective means of preventing ESD damage. Their primary use is in support of personnel who remove ESDS items from service or who place them in operation during which time items are outside of prescribed packaging. Kits are available which allow protection for ESDS items at the ultimate user level (see appendix A). Figure 7 reflects a typical kit as described in Appendix A. It is noted that these static dissipative mats with accessories are not a substitute for a complete ESD protective workstation. The kit is a field expedient and contains only the minimum requirements for ESD-control. This supplemental handling procedure for repair type
ESDS items is the only interim technique where the reuse of ESD preservation material is encouraged.
13
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business