Power Source Voltage Adjustment; How Does The Microwave Work - Panasonic NE-1252 Operating Instructions Manual

Power Source Voltage Adjustment

Models No. NE-1752/NE-1772/NE-2152
The microwave automatically detects 208 V and 230 V–240 V. Insert the plug, and if the Digital Display Window
goes blank 10 seconds after use, unplug and insert the plug again.

How Does The Microwave Work?

Microwaves are a form of high frequency radio waves
similar to those used by a radio including AM, FM, and
CB. They are, however, much shorter than radio waves;
approximately five inches long. Electricity is converted
into microwave energy by the magnetron tube. From the
magnetron tube, microwave energy is transmitted to the
oven cavity where it is: reflected, transmitted and
absorbed.
Reflection
Microwave are reflected by metal just as a ball is
bounced off a wall. A combination of stationary (interior
walls) and rotating antenna, located underneath the
bottom shelf and above the ceiling cover assure that the
microwaves are well distributed within the oven cavity to
produce even heating or cooking of foods.
Transmission
Microwave pass through some materials such as paper,
glass and plastic much like sunlight shining through a
window. Because these substances do not absorb or
reflect the microwave energy, they are ideal materials
for microwave oven heating containers when covered.
Absorption
During heating, microwaves will be absorbed by food.
They penetrate to a depth of about
Microwave energy excites the molecules in the food
(especially water, fat and sugar molecules), and causes
them to vibrate at a rate of 2,450,000,000 times per
second. This vibration causes friction, and heat is
produced just as you will feel heat produced if you
vigorously rub your hands together. The internal heating
of larger foods is done by conduction. The heat which is
produced by friction is conducted to the center of the
food. Foods also continue to heat by conduction during
standing time. ("carry-over" cooking)
Because microwave dissipate, much like sunlight as it
reaches the Earth's surface, they are not stored in food.
Radio Inference
1. Operation of the microwave oven may cause
interference to your radio, TV or similar equipment.
2. When there is interference, it may be reduced or
eliminated by taking the following measures:
a. Clean door and sealing surfaces of the oven.
(See Care of Your Microwave Oven found on
page 21.)
b. Place the radio, TV, etc. away from the microwave
oven as far as possible.
c. Use a properly installed antenna, on the radio to
obtain stronger signal reception.
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