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50 Cards in this Set
- Front
- Back
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The technical order for ESD information can be found in
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TO 00-25-234
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What means of static generation can cause the highest electrostatic voltages
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Walking across carpet
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Walking across carpet can produce how many electrostatic voltages
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35,000
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The level of voltage required for a human being to feel a static discharge is approximately
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3,500V
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Three types of failures caused by ESD are
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Intermittent, Latent, Catastrophic
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Certain technologies of parts are inherently sensitive to ESD and can fail at any voltage level between
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0-16,000 volts
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The personnel wrist straps shall be worn when working on energized parts, assemblies and equipment
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False
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What is required anytime an ESD sensitive item is stored or transported
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ESD protective packaging
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To seal/close ESD protective packaging you may use
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Non-Charge generating tapes
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What DC current value is usually fatal to human beings?
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300mA
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Three factors that determine the severity of electrical shock are
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Magnitude, Duration, Path
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When cleaning ESD sensitive items what type of isopropyl alcohol must be used
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70%
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For QA purpose a log shall be kept for daily initial test, the log will include
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Date, Time, Results, User name
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Wrist straps will be periodically tested
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Before initial use each day
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Persons working at ESD control workistations while circuit board repair is done shall roll up shirt sleeves above the elbow prior to and during repair
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True
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Basic static control workstations consist of three components, what are they
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Personal wrist strap, Common point ground system (CPGS), Static dissipative work surface
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The periodic performance test interval for solder guns or irons is
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Quarterly
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Areas utilizing static dissipative flooring shall not wax or apply any topical coatings of any kind. Standard floor cleaning procedures shall be used.
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True
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After testing the integrity of a wrist strap cuff and cord, the resistance for the strap and cord shall be between
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1-10 mega ohms
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The single most important item for effective static control is
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Personnel wrist strap
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When does ESD susceptibility stop
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after item is correctly packaged
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Some of today's circuits are sensitive to voltages as low as
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25V
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Common plastic bags picked up from a bench can cause electrostatic voltages of
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20,000
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An ohmmeter is used to check the integrity of grounding conductors and bonding for esd controlled
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workstations, cabinets, floors
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To prevent ESD damage, personnel should be using correct hardware, equipment, and be
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Properly trained
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Electronic parts considered SUPERSENSITIVE have revealed voltage sensitivities between
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0-999 volts
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What type of brush will be used prior to and during the cleaning of ESD sensitive items
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Camel hair brush
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Plastic or insullative/non-conductive materials shall be used on or around esd sensitive items
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False
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ESD items can check out electrically on the repair/test bench, but fail on the end item when subjected to stresses or applying normal operating voltages
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True
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What is the periodic interval for testing Work Surfaces
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Semi-annually
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The camel hair brush must be wet with a _________ isopropyl alcohol or greater, ________ to and during cleaning of ESD items
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70%.........Prior
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What are the three factors that determine the severity of electrical shock
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Magnitude of current flowing through the body, path of current through the body and duration of time that the current flows through the body
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How should raised floors be grounded
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Using a No. 8 copper wire for bonding between pedestal and verified ground point. Using an oxide inhibitor between the base metal of the raised floor pedistal and copper connection
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What is the ohm rating of the resistor used in the wrist strap cord
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1 mega ohm
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What is the ESD sensitivity voltage range for components classified as SENSITIVE
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0-16000 Volts
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Walking over a vinyl floor generates how much electrostatic voltage
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12,000 Volts
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What is the periodic interval for testing storage cabinets and flooring
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Annually, Annually
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The voltage to produce a fatal current depends on what
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Resistance of the body, contact conditions and path through the body
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You can seal ESD items in a bag with the following items, masking tape, scotch tape, duct tape
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False
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What are the four types of static control workstations
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Permanent static control workstation, workstation with rigid work surface, workstation with cushioned work surface and portable workstation
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What mil standard covers Test Methods and Procedures for Microelectronics
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MIL-STD-883
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All personnel who handle, operate, remove or install ESDS items must be _________ or _________ to the items
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Grounded or bonded
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Prior to removing or installing conductive caps, personnel shall
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Touch (with bare skin) and maintain contact with a metal portion of the items case or chassis
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If type 1 bags are used how should parts be initially wrapped
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In non-generation material
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Bags containing ESDS items should be sealed or closed
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True
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How ESDS items should be transported
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In static shielding and non-charge generating packages or containers
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After a qrist strap inspection is performed what should you do
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Document a log with date, time, results and user name for QA purposes
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A worker sliding in a chair padded with polyurethane will generate how much electrostatic voltage
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18,000 volts
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Opening and closing a vinyl envelope will generate how much electrostatic voltage
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7,000 Volts
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A worker moving at a bench will generate how much electrostatic voltage
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6,999 Volts
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