ZTE Corporation ZM8300G Manuale Utente

ZTE ZM8300G Module Hardware User Manual

ohms if being measured from the metal shell of the device). The ground resistance of a

soldering iron tip should be less than 20 ohms.

 A factory building should be equipped with antistatic ground cables, and antistatic

common ground points should be set up on each floor. The ground resistance of a factory

building should be less than 1 ohm. The resistance between a ground cable shared by

devices and an antistatic common ground point should be less than 1 ohm.

 In an electrostatic discharge protected area (EPA), antistatic dual-circuit wrist straps

should be available, all wrist straps should be inserted into dedicated wrist strap jacks, and

tools, devices, and ground cables that are fixed, except antistatic wrist straps and mobile

device tools, must not be grounded using alligator clips.

 Ensure that tools' and devices' antistatic ground points are connected to antistatic

ground cables in parallel. Antistatic common ground bars are preferred, and series

connections are prohibited.

 Ensure that SMT devices, board-assembled devices, devices used to assemble and

commission modules and systems, and devices/tools with antistatic ground points (for

example, a soldering iron) are grounded using separate antistatic ground cables. That is,

separate ground cables are connected from metal ground parts of the devices/tools to

antistatic ground cables, to ensure that the devices/tools are reliably grounded.

 Set up EPAs according to ANSI/ESD S20.20 and IEC 61340-5-1 (international standard

systems for ESD protection), and ensure that the electrostatic sensitivity (HBM) is less than

100 V. That is, devices with the electrostatic sensitivity equal to or greater than 100 V can be

effectively protected in EPAs.

 Take antistatic measures for static-electricity-generating articles that are required in an

EPA (for example, plastic parts, devices, and monitors used in the assembly procedure), for

example, using an ionizing air blower, applying antistatic liquid, and using a static shielding

bag/net. Ensure that electrostatic sensitive devices, boards, and components are 30 cm or

more away from non-eliminable static-electricity-generating sources. Within the range 30 cm

away from electrostatic sensitive devices, boards, and components, ensure that the friction

voltage is less than 100 V.

 Use tools made of antistatic materials to turn over electrostatic sensitive devices,

boards, and components, for example, antistatic foam, antistatic boxes, antistatic

vacuum-formed plastic boxes, antistatic tote carts, and antistatic shielding bags. Do not

place electrostatic sensitive devices, boards, and components directly in containers without

ESD protection, for example, ordinary EPE trays, ordinary vacuum-formed plastic boxes,

ordinary plastic bags, ordinary plastic boxes, ordinary hollow boxes, and tote carts without

ESD protection.

 Before transporting electrostatic sensitive devices, boards, and components in non-EPA

areas, for example, trans-plant transportation, perform antistatic closed packaging for the