5.12 Flashcards
1
Q
What is ESD?
A
Electrostatic sensitive devices
2
Q
What problems were caused by ESD?
A
New generation had unserviceability rate 3 to 4 times higher under the same handling conditions as the older generation.
3
Q
What happens to ESD’s in circuit boards?
A
May be damaged by transient electrical static charges.
4
Q
What percentage of ESD’s do not cause total failure?
A
80-90%
5
Q
Why is ESD a problem?
A
The faulty inter grated circuit is hard to inspect and automatic test equipment isn’t able to discover the problem
6
Q
What are the factors that contribute to static electricity.
A
- humidity
- temp
- material
- movement
7
Q
If a shock causes pain how many volts will it be
A
5,000 V
8
Q
What voltage can cause damage to modern ESDs
A
Low as 100 V
9
Q
Results from an ESD
A
- overheat
- evaporation
- bend
- later split
- holes
10
Q
How can ESD be reduced
A
- facilities
- Ppe
- antistatic safeguards
- identification of ESD devices
- handling
- training of personnel
11
Q
Precautions for ESD
A
- personnel should be trained
- ESD devices stored in anti static materials
- only handles at grounded
- handle fault parts with same care
- text equipment
- turn off power before removing
- bristle brushes for cleaning
