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Module 5: Digital Techniques and
Electronic Instrument Systems
5.12 Electrostatic Sensitive Devices
Electrostatic discharge
 ESD: Electrostatic Discharge.
 The sudden flow of electricity
between two objects.
 Caused by imbalance of
electrons between the 2 objects.
 A field created by tens of volts
between the 2 objects is enough
to damage a RAM module.
 Walking on a vinyl floor can
generate up to 12,000V of static
electricity.
 ESD abbreviation can also mean
“Electrostatic Sensitive Device”
Common Electrostatic Sensitive Devices &
actions causing ESD.
 Devices prone to ESD:
 MOSFETS
 CMOS ICs (Chips)
 Computer cards (CPU, GPU, etc.)
 LED, Diodes
 Actions causing ESD:
 Opening a plastic bag.
 Removing a tape from a roll or a container.
 Transporting computer components around with trays or
carts.
 Dry environments (non-humid) increase the possibility of
ESD.
ESD Prevention of working personnel
 Methods to remove
charge from the human
body:
 Touching metallic objects.
 Wrist band.
 Antistatic garment.
Other methods to prevent ESD when
working with electronic equipment
 Avoid touching connections or
pins.
 Ground all test equipment.
 Use Antistatic mat:
 Made a low resistance
material (10ΚΩ to 100ΜΩ) that
is grounded. It allows slow
discharging.
 Use Antistatic Agent:
 A compound used that makes
the surface of a material
conductive, thus reducing or
preventing ESD. Usually
absorbs moisture from the air.
 They are often added to jet
fuels.
ESD Preventing Materials
 Conductive Materials:
 Materials with resistance between 1ΚΩ & 1ΜΩ/m2
 Dissipative Materials:
 Materials with resistance between 1ΜΩ /m2 & 1ΤΩ /m2
 Shielding Materials:
 Materials that attenuate current and electric fields.
Static electricity on the aircraft
 The aircraft picks static charges from rain, cloud,
snow etc. (precipitation static)
• Strong charges developed between different parts of the plane
can break down the insulator between them.
• Problems caused by static electricity on the aircraft:
Material damage, Corrosion, Electromagnetic interference etc.
Corona Threshold and
Static electricity control
 The Corona Threshold: High velocity gasses exiting
the engine  Static electricity dissipates
surrounding atmosphere from sharp edges EMF.
 Solutions to control static electricity:
 Bonded (i.e. interconnection) of electronic equipment.
 Wickes (to eliminate static electricity dissipation from
sharp edges).
Wicks
ESD signs

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5.12 Electrostatic sensitive devices

  • 1. Module 5: Digital Techniques and Electronic Instrument Systems 5.12 Electrostatic Sensitive Devices
  • 2. Electrostatic discharge  ESD: Electrostatic Discharge.  The sudden flow of electricity between two objects.  Caused by imbalance of electrons between the 2 objects.  A field created by tens of volts between the 2 objects is enough to damage a RAM module.  Walking on a vinyl floor can generate up to 12,000V of static electricity.  ESD abbreviation can also mean “Electrostatic Sensitive Device”
  • 3. Common Electrostatic Sensitive Devices & actions causing ESD.  Devices prone to ESD:  MOSFETS  CMOS ICs (Chips)  Computer cards (CPU, GPU, etc.)  LED, Diodes  Actions causing ESD:  Opening a plastic bag.  Removing a tape from a roll or a container.  Transporting computer components around with trays or carts.  Dry environments (non-humid) increase the possibility of ESD.
  • 4. ESD Prevention of working personnel  Methods to remove charge from the human body:  Touching metallic objects.  Wrist band.  Antistatic garment.
  • 5. Other methods to prevent ESD when working with electronic equipment  Avoid touching connections or pins.  Ground all test equipment.  Use Antistatic mat:  Made a low resistance material (10ΚΩ to 100ΜΩ) that is grounded. It allows slow discharging.  Use Antistatic Agent:  A compound used that makes the surface of a material conductive, thus reducing or preventing ESD. Usually absorbs moisture from the air.  They are often added to jet fuels.
  • 6. ESD Preventing Materials  Conductive Materials:  Materials with resistance between 1ΚΩ & 1ΜΩ/m2  Dissipative Materials:  Materials with resistance between 1ΜΩ /m2 & 1ΤΩ /m2  Shielding Materials:  Materials that attenuate current and electric fields.
  • 7. Static electricity on the aircraft  The aircraft picks static charges from rain, cloud, snow etc. (precipitation static) • Strong charges developed between different parts of the plane can break down the insulator between them. • Problems caused by static electricity on the aircraft: Material damage, Corrosion, Electromagnetic interference etc.
  • 8. Corona Threshold and Static electricity control  The Corona Threshold: High velocity gasses exiting the engine  Static electricity dissipates surrounding atmosphere from sharp edges EMF.  Solutions to control static electricity:  Bonded (i.e. interconnection) of electronic equipment.  Wickes (to eliminate static electricity dissipation from sharp edges).