Panasonic NE1054F NE1022F User Guide - Page 6

Reflection, Transmission, Absorption, Radio, Interference

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Microwaves are a form of high frequency radio waves similar to those used bya 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 and absorbed. Reflection Microwaves 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 assure that the microwaves are well distributed within the oven cavity to produce even heating or cooking of foods. Absorption During heating, microwaves will be absorbed by food. They penetrate to a depth of about to 1Y2-inches. 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 later foods is done by conduction. The heat which is produced by friction travels by conduction to the center of the food. Foods also continue to heat by conduction during standing time. Because microwaves dissipate, much like sunlight as it reaches the Earth's surface, they are not stored in food. Transmission Microwaves 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. 4 II bW l Radio Interference 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 sufaces of the oven. See Care of Your Microwave Oven found on page 18.) b. Placithe radio, TV, etc, away from the microwave oven as far as possible. c. Use a properly installed antenna, to obtain stronger signal reception. - 6 -

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Microwaves
are
a
form
of
high
frequency
radio
waves
similar
to
those
used
bya
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
and
absorbed.
Reflection
Microwaves
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
assure
that
the
microwaves
are
well
distributed
within
the
oven
cavity
to
produce
even
heating
or
cooking
of
foods.
Transmission
Microwaves
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.
4
I
I
bl
W
Absorption
During
heating,
microwaves
will
be
absorbed
by
food.
They
penetrate
to
a
depth
of
about
to
1Y2
-inches.
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
later
foods
is
done
by
conduction.
The
heat
which
is
produced
by
friction
travels
by
conduction
to
the
center
of
the
food.
Foods
also
continue
to
heat
by
conduction
during
standing
time.
Because
microwaves
dissipate,
much
like
sunlight
as
it
reaches
the
Earth's
surface,
they
are
not
stored
in
food.
Radio
Interference
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
sufaces
of
the
oven.
See
Care
of
Your
Microwave
Oven
found
on
page
18.)
b.
Placithe
radio,
TV,
etc,
away
from
the
microwave
oven
as
far
as
possible.
c.
Use
a
properly
installed
antenna,
to
obtain
stronger
signal
reception.
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6
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