Ch 02 - Electromagnetic Compatibility Flashcards Preview

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Flashcards in Ch 02 - Electromagnetic Compatibility Deck (27):
1

2–1 electromagnetic compatibility (EMC)

EMI =

 

Frequency overlap

2

2–2 EMC

Electromagnetic spectrum =

(7)

Light

radiowaves

microwaves

infrared (IR)

radiation

ultraviolet rays

x-rays

gamma rays

3

2–2 EMC

Electromagnetic spectrum visible lights =

 

10^15 (1PHz)

4

2-2 electromagnetic spectrum

PHz =

 

Petahertz

5

2–3 EMC

Conducted coupling =

 

Except solid-state devices, does not belong

6

2–4 EMC

ITS designer =

Not directly responsible of EMC of ITS

7

2–6 EMC electromagnetic

Internal EMI sources =

 

Except incandescent light fixtures, does not belong

8

2–8 EMC

EMC measurement =

 

No techniques to measure

9

2–16 EMC – the solution

EMI types =

(2 and their examples)

 

* man-made: Conversion, distribution, generators

* natural: Atmospheric electricity, Cosmic radiation/geomagnetism disturbances

10

2–19 EMC electromagnetic qualification parameters

ESD =

 

Electrostatic discharge

11

2–19 EMC electromedical qualification parameter

type of ESD =

 

Discharge through a spark in the air

12

2–20 EQP 

Immunity Air L2 =

 

4kV

13

2–20 EQP

Immunity contact L4 =

 

8kV

14

2–20 electromagnetic qualification parameters

Immunity contact L2 =

4kV

15

2–27 EMC

CRT =

(2)

 

* cathode ray tube

* susceptible to RFI

16

2–28 EMC unwanted signals

Types of unwanted signals in EMI =

(2)

 

* common-mode (CM)

* differential mode (DM)

17

2–28 EMC unwanted signal

CM =

(2)

 

* Predominant unwanted signal

* locks up computer

18

2-28  unwanted signals

ferrite beads = 

 

filter unwanted signal

19

2–29 EMC unwanted signals

DM noise =

 

Corrupting transmitted signals on a balance circuit

20

2–44 cabling systems

Branch circuits of 5kVA =

 

No additional separation necessary

21

2–44 cabling system

Minimum separation electrical motors and transformers =

 

47in

22

2–44 cable separation

Minimum separation for unshielded power, nonmetal pathways =

 

24in

23

2–44 cabling separation

Min. separation unshielded power, grounded metal conduit =

 

12in

24

2–44 cable separation

Min separation power lines enclosed, grounded metal conduit =

 

6in

25

2-44 cable separation

Metallic cabling and EMI source separation =

 

Fluorescent lamps, 5.12in

26

2–51 telecom cabling joint use tunnel

Three components in joint use tunnel =

 

Except unbalanced DM fields, do not belong

27

2–51 telecom cabling joint use tunnel

Coupling mutual capacitance/mutual conductance =

 

Except signal injector, does not belong