HP Z420 D3J34UT#ABA Personal grounding methods and equipment, Materials Method Voltage, Grounding

Personal grounding methods and equipment

Use the following items to help prevent ESD damage:

●Wrist straps — These are flexible straps with a maximum of one megohm ± 10% resistance in the ground cords. To provide a proper ground, wear the strap against bare skin. The ground cord must be connected and fit snugly into the banana plug connector on the grounding mat or computer.

●Heel straps, toe straps, and boot straps — These can be used at standing computers and are compatible with most types of shoes or boots. On conductive floors or dissipative floor mats, use them on both feet with a maximum of one megohm ± 10% resistance between the operator and ground.

Static shielding	Static shielding materials provide the following levels of protection.
materials
	Method		Voltage
	Antistatic plastic		1,500V
	Carbon-loaded plastic		7,500V
	Metalized laminate		15,000V
Grounding the	● Cover the work surface with approved	●	Disconnect power and input signals before
work area to	static-dissipative material. Use a wrist		inserting and removing connectors or test
prevent static	strap connected to the work surface, and		equipment.
damage	properly grounded tools and equipment.	●	Use fixtures made of static-safe materials
	● Use static-dissipative mats, foot straps, or		when fixtures must directly contact
	air ionizers to give added protection.		dissipative surfaces.
	● Handle electrostatic-sensitive	●	Keep work area free of nonconductive
	components, parts, and assemblies by		materials, such as plastic assembly aids and
	the case or PCB laminate. Handle them		Styrofoam.
	only in static-free work areas.	●	Use field service tools (such as cutters,

screwdrivers, and vacuums) that are conductive.

Recommended ESD prevention materials and equipment

●Antistatic tape

●Antistatic smocks, aprons, and sleeve protectors

●Conductive bins and other assembly or soldering aids

●Conductive foam

●Conductive tabletop computers with a ground cord of one megohm ± 10% resistance

●Static-dissipative table or floor mats with a hard-tie to ground

●Field service kits

●Static awareness labels

●Wrist straps and footwear straps providing one megohm ± 10% resistance

●Material-handling packages

●Conductive plastic bags

●Conductive plastic tubes

●Conductive tote boxes

●Opaque shielding bags

●Transparent metallized shielding bags

●Transparent shielding tubes

80 Chapter 3 Component Replacement Information and Guidelines