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RCDD > Ch. 2 (Electromagnetic Compatibility) > Flashcards

Ch. 2 (Electromagnetic Compatibility) Flashcards

0
Q

Conducted coupling

A

Except solid state

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1
Q

Visible light

A

10 to the 15th power

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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

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

A

5.12”

19
Q

Separation from power in grounded metal conduit

A

6”

20
Q

Separation from unshielded power lines near grounded metal conduit

A

12”

21
Q

Separation from unshielded power lines near open pathways

A

24”

22
Q

Separation from electrical motors & transformers

A

47”

23
Q

Mitigate unwanted signals w/ ___

A

Ferrite beads

24
Q

Magnetic scheme

A

Filters unwanted signals

25
Q

Two types of EMI

A

Man-made

Natural

26
Q

How to measure EMC

A

There is no technique

27
Q

EMC =

A

Electromagnetic Compatibility

28
Q

Separation for arc welders

A

31.5”

29
Q

Electromagnetic fields are ___ undesirable

A

Not always

30
Q

___ are created when inductive and capacitive circuits are switched on and off

A

Electrical fast transient (EFT) disturbances

31
Q

Inadequate gaskets/enclosures can be a source of ___

A

Radiated interference

32
Q

RMS power

A

.707

33
Q

Difference between two grounds should be no more than ___

A

1.00

34
Q

Modern electronics are ___ susceptible to EMI

A

More

35
Q

Instrumentation shield grounding

Grounding for longer shield runs

A

One end

Both ends

36
Q

Minimum CM rejection ratio

A

40 dB

RCDD (24 decks)

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