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1.2 Installation Requirements
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Table 1.2-3 External Noise Sources
Classification
Noise
Source
Source Equipment
Electric equipment
with contacts
Electric discharge
(spark, arc)
Flasher (neon sign, ornamental electric
bulb), relay, electromagnetic contactor,
thermostat (warmer, refrigerator, heating
iron), cash register
Equipment utilizing
brush type motor
Electric discharge
(spark, arc),
sliding contact
Electric drill, laboratory engine, motor of
sewing machine, cleaner, food mixer,
shaver, massaging machine
Electric discharge
tube
Glow discharge Neon discharge tube, high pressure
mercury arc lamp
Small-sized
electric
equipments
Controller utilizing
semiconductor
Phase control
(transient noise)
Thyristor dimmer, inverter
Industrial high
frequency
equipment
* Electro-magnetic
emission
Industrial high frequency heater, high
frequency electric welder, microwave
oven
Medical high
frequency
equipment
* Electro-magnetic
emission
VHF/UHF devices, electric scalpel
Equipment
using high
frequency
Equipment utilizing
ultrasonic wave
* Electro-magnetic
emission
Flaw detector, depth sounder, fish finder,
ultrasonic cleaner
Electric or
magnetic filed,
Ground current
Induction of commercial frequency
(electrostatic induction, electromagnetic
induction, current leaking in ground)
Power cable
(transmission line)
Electric discharge
(corona, arc)
Corona, poor insulator, poor contact due
to corroded metal (arc discharge)
Electric discharge
(spark, arc)
Trolley wire, internal equipment, rectifier
Power
equipment
Electric
railroad/train
Magnetic field Current flow deviation
Electric discharge Ignition system Internal
combustion
engine
Automobile
Other Dynamo, voltage regulator, wiper, horn,
winker
*Electro-magnetic
emission
Broadcasting equipment, radar Large power
Radio frequency
equipment
Electro-magnetic
emission
Radio transceiver
＊ Emission that are signals in a given system but cause interference in other systems.