R-657SL (serv.man14). Complete - Sharp Home Appliance User Guide / Operation Manual. Page 8

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6
800W
HEATING CATEGORY
The heating category (a letter A to E) developed 
by MAFF (Ministry of Agriculture, Fisheries 
and Food) with microwave oven and food 
manufacturers indicates the ability of the oven 
to heat small quantities of food (up to 500g 
[1lb 2oz]). It does not represent the general 
performance of the oven.
HOW YOUR OVEN WORKS
Microwaves are energy waves, similar to those 
used for  TV and radio signals.
Electrical energy is converted into microwave 
energy, which is directed into the oven cavity via 
a waveguide.  To prevent food and grease entering 
the wave guide it is protected by the waveguide 
cover.
Microwaves cannot pass through metal, because 
of this the oven cavity is made of metal and there 
is a fine metal mesh on the door.
During cooking the microwaves bounce off the 
sides of the oven cavity at random.
Microwaves will pass through certain materials, 
such as glass and plastic, to heat the food.
(See ‘Suitable Cookware’ on page 25).
Water, sugar and fat in food absorb microwaves 
which cause them to vibrate.  This creates heat 
by friction, in the same way your hands get warm 
when you rub them together.
The outer areas of the food are heated by the 
microwave energy, then the heat moves to the 
centre by conduction, as it does in conventional 
cooking. It is important to turn, rearrange or stir 
food to ensure even heating.
Once cooking is complete, the oven automatically 
stops producing microwaves.
Standing time is necessary after cooking, as it 
enables the heat to disperse equally throughout 
the food.
Microwave output power 
in Watts (based on 
international (IEC 60705) 
standard).
Letter representing the 
oven heating category.
Microwave Symbol.
600  700  800  900  1000 Watts
OVEN 
OUTPUT 
POWER
Less heating time required
More heating time required
OVEN 
OUTPUT 
CATEGORY
Less heating time required
More heating time required
A       B       C      D       E
Food packs carry cooking instructions for 
heating categories A to E. Follow instructions for 
the letter corresponding to the oven’s heating 
category.  The higher the output power and 
heating category of the oven the less heating time 
is required as shown opposite.
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