Hioki 3144-20, Manual

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Chapter 1 Overview
12
Noise sources:
There are many noise sources, such as power
transmission lines, electric railways, inverter units,
and CB radios.
Penetration routes:
Some noise enters through communication lines,
power supply lines, and ground wires, while other
noise penetrates devices directly.
Propagation routes:
Noise is propagated through various routes,
including communication lines and power supply
lines.
The instrument can search for noise frequency
bands and penetration routes by simply attaching
the 9741 CLAMP ON VOLTAGE SENSOR.
Cell phone
Penetrates through
communication
lines
Penetrates through power
supply lines
Extension line
Lighting apparatus
Home appliances
Power supply
lines
Communi-
cation lines
Penetrates through
ground wires
Main unit
3144-20
Penetrates directly