(OLD) Ch 02 - Electromagnetic Compatibility Flashcards
2–2 EMC
Electromagnetic spectrum =
7
Light radio waves microwaves infrared (IR) radiation ultraviolet rays x-rays gamma rays
2–1 electromagnetic compatibility (EMC)
EMI =
Frequency overlap
2–2 EMC
Electromagnetic spectrum visible lights =
10^15 (1PHz)
2–3 EMC
Conducted coupling =
Except solid-state devices, does not belong
2–4 EMC
Q: do electrical codes provide for EMC?
No
2-2 electromagnetic spectrum
PHz =
Petahertz
2–4 EMC
ITS designer =
Not directly responsible of EMS of ITS
2–6 EMC electromagnetic
Internal EMI sources =
Except incandescent light fixtures, does not belong
2–8 EMC
EMC measurement =
No techniques to measure
2–16 EMC – the solution
EMI types =
2 and their examples
- man-made:
Conversion
distribution
generators - natural:
Atmospheric electricity
Cosmic radiation/geomagnetism disturbances
2–19 EMC electromagnetic qualification parameters
ESD =
Electrostatic discharge
2–19 EMC electromedical qualification parameter
type of ESD =
Discharge through a spark in the air
2–27 EMC
CRT =
2
- cathode ray tube
* susceptible to RFI
2–28 EMC unwanted signals
Types of unwanted signals in EMI =
2
- common-mode (CM)
* differential mode (DM)
2–28 EMC unwanted signal
CM =
2
- Predominant unwanted signal
* locks up computer
2–29 EMC unwanted signals
DM noise =
Correcting transmitting signals on a balance circuit
2–51 telecom cabling joint use tunnel
Three components in joint use tunnel =
Except unbalanced DM fields, do not belong
2–51 telecom cabling joint use tunnel
Coupling mutual capacitance/mutual conductance =
Except signal injector, does not belong
2–20 EQP
Immunity contact L4 =
8kV
2–44 cabling system
Minimum separation electrical motors and transformers =
47in
2–44 cabling systems
Branch circuits of 5kVA =
No additional separation necessary
2–20 EQP
Immunity Air L2 =
4kV
2–44 cable separation
Minimum separation for unshielded power, nonmetal pathways =
24in
2-44 cable separation
Metallic cabling and EMI source separation =
Fluorescent lamps, 5.12in
