LG MS-194A, Service Manual

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3. The safety of microwave oven
Since the microwave oven can’t make the native fire like gas, you have no use for worrying about the fire.
Because it doesn’t become hot like the ordinary electric range. It has been used in the dinner car of the trains etc.
Microwave oven has the shielded structure strictly with metal case not to leak electric wave at once not only using but on opening
the door.
Because it uses the electric wave, the x-ray is never emitted. The UHF wave generally called microwave is like the electric wave of
the TV or the radio and is used for the wireless communication, the radar and the UHF medical instruments (using 2450 MHz like
that of the microwave oven, etc).
4. Definition of electric wave
* An electric wave is the electron wave of the frequency from 10 KHz to 3,000,000 MHz.
* Wave length of 2450 MHZ.
3-1. What’s the microwave? (2/2)
λ
: Wave Length
Where c: The Velocity of Light
f: Frequency
c
f
λ
300000 Km
245000 KHz
0.122 m 12.2 cm
The division from the sound frequency to the light frequency.
FREQ
NAME
USE
20 Hz
-
20 KHz
SOUND
WAVE
MUSIC
3 Hz
-
30 KHz
VLF
SHIP
30 Hz
-
300 KHz
LF
RADIO
300 KHz
-
3 MKHz
MF
RADIO
3 MHz
-
30 MHz
HF
RADIO
30 MHz
-
300 MHz
VHF
T.V
300 MHz
-
3 GHz
ULF
MWO
T.V
3 GHz
-
30 GHz
SHF
RADAR
30 GHz
-
300 GHz
EHF
RADAR
300 GHz
-
10 16 Hz
LIGHT