Docstoc

ESD BASIC TRAINNING

Document Sample
ESD BASIC TRAINNING Powered By Docstoc
					ESD Basic Training
 ZTEC Instruments, Inc.
      May 2007
        Rev. 1
                      Outline
I.   ESD General Information
•    About ESD
•    Instrument Damage

II. ESD Guidelines
•     ESD sensitive devices
•     Basic Rules



                                2
            What is Electrostatic
               Discharge?


• Electrostatic Discharge, also called ESD,
  is the rapid, spontaneous transfer of
  electric charge between two objects.




                                              3
     Examples of Static Generators


• Unrolling adhesive tape

• Walking across carpet

• Petting a cat

• Drying clothes without using dryer sheets
                                              4
         Examples of Electrostatic
            Discharge (ESD)
• A zap felt on a doorknob after walking
  across a carpet




• Lightning

                                           5
              General ESD Info


ESD you can’t feel: 0 to 2kV

ESD you might feel: 2kV to 4kV

ESD you can probably feel and see as
spark : 4kV to 16kV

                                       6
          Instrument Damage
• However, AS LITTLE AS 3 VOLTS COULD
  DAMAGE COMPONENTS!!!




                                        7
                   ESD Damage
Types of Damage
   • Latent Failure - A component may be wounded but
   passes inspection. Example: A ZTEC Instrument may pass
   manufacturing tests but fail in the field.
   • Catastrophic Failure - ESD damage is detected during
   test.

Costs of Damage
  • Latent Failure cause more returns, more warranty
     costs, and lower customer satisfaction.
  • Improper ESD precautions decreases productivity.

                                                       8
           ESD Sensitive Devices
Examples of ESD Sensitive Devices:

• Printed Circuit Boards
• Microchips


As electronic devices become smaller
  and more precise, they become
  more sensitive and susceptible to
  ESD damage. All ZTEC products
  are highly ESD sensitive!!!


                                       9
             ESD signs and symbols
• The ESD Susceptibility Symbol consists of a
  triangle, a reaching hand, and a slash through the
  reaching hand. The triangle means "caution" and
  the slash through the reaching hand means "Don't
  touch."




• The ESD Protective Symbol (Figure 4) consists of
  the reaching hand in the triangle. An arc around
  the triangle replaces the slash. This "umbrella"
  means protection. The symbol indicates ESD
  protective material


                                                       10
        Products that help control ESD

•   ESD dissipative smocks and gloves
•   ESD dissipative paper
•   Dissipative binders & document protectors
•   Antistatic tape
•   ESD shielded bags
•   Conductive totes and boxes
•   Conductive & dissipative flooring
•   ESD dissipative chairs and chair coverings



                                                 11
          Basic Rules for entering an
             ESD sensitive area:

• Only trained people allowed in ESD Protected Area.
  • All visitors and untrained personnel must be escorted.
• Always wear an ESD dissipative smock, buttoned up all
  the way, BEFORE entering the lab area.
• Practice the “3 foot rule”. Always be grounded if you are
  within 3 feet of any ESD sensitive item.
• Do not bring unnecessary insulators (objects which can
  hold electrostatic charge, such as paper, plastic, and
  Styrofoam) into the lab.

                                                              12
       Wrist Straps and Grounding
                  Cords:
• Wrist straps should be worn snugly with
  the metal plate against the skin.
• Test wrist straps daily.
• Shake wrist strap while testing to check for
  intermittent connections.




                                             13
                  ESD Workstations
When working in an ESD Sensitive Area:

• Plug in wrist strap to a proper ground point, prior to handling
  any ESD sensitive product.
• Store ESD sensitive items in ESD shielded bags or boxes.
• Never leave out any ESD sensitive items on workbenches.
• Keep ESD sensitive areas free of unnecessary insulators.




     Conductive
      Container                                ESD Shielded bag
                                                                  14

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:25
posted:6/30/2012
language:
pages:14