Ch. 2 (Electromagnetic Compatibility) Flashcards

1
Q

Conducted coupling

A

Except solid state

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2
Q

Internal EMI sources

A

Power lines
Motors
Cell phones
Except “incandescent lighting” or “electrical power cables”

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3
Q

EMI sources (natural)

A

Atmospheric electricity

Cosmic radiation

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4
Q

Electrostatic discharge

A

Spark in the air

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5
Q

CRT

A

Cathode Ray Tube

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6
Q

What interferes with CRTs

A

RFI

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7
Q

Unwanted signals

A

CM - common mode

DM - differential mode

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8
Q

An example of common mode

A

Locking up a computer

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9
Q

Differential mode affects

A

Corrupting transmitted signals

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10
Q

Types of EMI

A

Except unbalanced DM fields

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11
Q

Coupling mutual capacitance/inductance

A

Except signal injector

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12
Q

Tunnel problems

A

Except unbalanced DM fields

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13
Q

Man-made EMI sources

A

Electrical power
Generator
Communications electronics

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14
Q

ESD =

A

Electrostatic Discharge

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15
Q

Types of ESD

A

Spark
Radiated
Contact

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16
Q

ESD immunity

A

Contact level 2 - 4 KV
Contact level 4 - 8 KV
Air level 2 - 4 KV

17
Q

Less than 5KVA

A

No separation necessary

18
Q

Separation requirements for fluorescent lamps

19
Q

Separation from power in grounded metal conduit

20
Q

Separation from unshielded power lines near grounded metal conduit

21
Q

Separation from unshielded power lines near open pathways

22
Q

Separation from electrical motors & transformers

23
Q

Mitigate unwanted signals w/ ___

A

Ferrite beads

24
Q

Magnetic scheme

A

Filters unwanted signals

25
Two types of EMI
Man-made | Natural
26
How to measure EMC
There is no technique
27
EMC =
Electromagnetic Compatibility
28
Separation for arc welders
31.5"
29
Electromagnetic fields are ___ undesirable
Not always
30
___ are created when inductive and capacitive circuits are switched on and off
Electrical fast transient (EFT) disturbances
31
Inadequate gaskets/enclosures can be a source of ___
Radiated interference
32
RMS power
.707
33
Difference between two grounds should be no more than ___
1.00
34
Modern electronics are ___ susceptible to EMI
More
35
Instrumentation shield grounding Grounding for longer shield runs
One end Both ends
36
Minimum CM rejection ratio
40 dB
37
Visible light
10 to the 15th power