1.2Installation Requirements

Table 1.2-3 External Noise Sources

Classification

Noise

Source Equipment

Source

 

 

 

 

 

 

 

Small-sized

Electric equipment

Electric discharge

Flasher (neon sign, ornamental electric

electric

with contacts

(spark, arc)

bulb), relay, electromagnetic contactor,

equipments

 

 

thermostat (warmer, refrigerator, heating

 

 

 

iron), cash register

 

 

 

 

 

Equipment utilizing

Electric discharge

Electric drill, laboratory engine, motor of

 

brush type motor

(spark, arc),

sewing machine, cleaner, food mixer,

 

 

sliding contact

shaver, massaging machine

 

 

 

 

 

Electric discharge

Glow discharge

Neon discharge tube, high pressure

 

tube

 

mercury arc lamp

 

 

 

 

 

Controller utilizing

Phase control

Thyristor dimmer, inverter

 

semiconductor

(transient noise)

 

 

 

 

 

Equipment

Industrial high

* Electro-magnetic

Industrial high frequency heater, high

using high

frequency

emission

frequency electric welder, microwave

frequency

equipment

 

oven

 

 

 

 

 

Medical high

* Electro-magnetic

VHF/UHF devices, electric scalpel

 

frequency

emission

 

 

equipment

 

 

 

 

 

 

 

Equipment utilizing

* Electro-magnetic

Flaw detector, depth sounder, fish finder,

 

ultrasonic wave

emission

ultrasonic cleaner

 

 

 

 

Power

Power cable

Electric or

Induction of commercial frequency

equipment

(transmission line)

magnetic filed,

(electrostatic induction, electromagnetic

 

 

Ground current

induction, current leaking in ground)

 

 

 

 

 

 

Electric discharge

Corona, poor insulator, poor contact due

 

 

(corona, arc)

to corroded metal (arc discharge)

 

 

 

 

 

Electric

Electric discharge

Trolley wire, internal equipment, rectifier

 

railroad/train

(spark, arc)

 

 

 

 

 

 

 

Magnetic field

Current flow deviation

 

 

 

 

Internal

Automobile

Electric discharge

Ignition system

combustion

 

 

 

 

Other

Dynamo, voltage regulator, wiper, horn,

engine

 

 

 

winker

 

 

 

 

 

 

 

Large power

 

*Electro-magnetic

Broadcasting equipment, radar

Radio frequency

 

emission

 

equipment

 

 

 

 

Electro-magnetic

Radio transceiver

 

 

 

 

emission

 

 

 

 

 

 

 

＊Emission that are signals in a given system but cause interference in other systems.

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