HP EliteDesk 800 Maintenance and Service Guide - HP EliteDesk 800 G1 Tower, HP - Page 48

Generating static The following table shows that: ● Different activities generate different amounts of static electricity. ● Static electricity increases as humidity decreases. Event 55% Walking across carpet 7,500 V Walking across vinyl floor 3,000 V Motions of bench worker 400 V Removing DIPs from plastic tube 400 V Removing DIPs from vinyl tray 2,000 V Removing DIPs from Styrofoam 3,500 V Removing bubble pack from PCB 7,000 V Packing PCBs in foam-lined box 5,000 V These are then multi-packaged inside plastic tubes, trays, or Styrofoam. Relative Humidity 40% 15,000 V 5,000 V 800 V 700 V 4,000 V 5,000 V 20,000 V 11,000 V 10% 35,000 V 12,000 V 6,000 V 2,000 V 11,500 V 14,500 V 26,500 V 21,000 V NOTE: 700 volts can degrade a product. Preventing electrostatic damage to equipment Many electronic components are sensitive to ESD. Circuitry design and structure determine the degree of sensitivity. The following packaging and grounding precautions are necessary to prevent damage to electric components and accessories. ● To avoid hand contact, transport products in static-safe containers such as tubes, bags, or boxes. ● Protect all electrostatic parts and assemblies with conductive or approved containers or packaging. ● Keep electrostatic sensitive parts in their containers until they arrive at static-free stations. ● Place items on a grounded surface before removing them from their container. ● Always be properly grounded when touching a sensitive component or assembly. ● Avoid contact with pins, leads, or circuitry. ● Place reusable electrostatic-sensitive parts from assemblies in protective packaging or conductive foam. 36 Chapter 4 Routine care, SATA drive guidelines, and disassembly preparation