Table of Contents
Advertisement
R -9200
TEST
PROCEDURES
(CONT'D)
PROCEDURE
LETTER
COMPONENT
TEST
(Tl OC)
IT2 OC)
(T2 OC)
Heat up for 1 min. 45 sec.
(RD82A02U)
MICROWAVE
OUTPUT
POWER
(IEC-7054988)
The following
test procedure
should
be carried out with the microwave
oven in a fully assembled
condition
(outer case fitted).
Microwave
output
power from the magnetron
can be measured by
way of IEC 705, i.e. it can be measured by using water load how much it can be absorbed
by the
water load.
To measure the microwave
output
power in the microwave
oven, the relation
of cal-
orie and watt is used. When P(W) heating works for t(second),
approximately
P x t/4.1 87 calorie
is generated.
On the other hand, if the temperature
of the water with V(ml)
rises AT ("C) during
this microwave
heating
period, the calorie of the water is V x AT.
The formula
is as follows;
Pxt/4.187=VxAT
P(W)
=4.187xVxAT/t
Our condition
for the water load is as follows:
Room temperature
. . . . . . . . . . . . . . . . . . . . . around 20°C
Power supply Voltage . . . . . . . . . . . . . Rated voltage
Water load . . . . . . . . 1000 g
Initial temperature
. . . . . . . 10 +2"C
Heating time . . . . . . . . . . . . . . . . 47 sec.
P=90xAT
Measuring
condition:
1. Container
The water container
must be a cylindrical
borosilicate
glass vessel having a maximum
material
thickness
of 3 mm and an outside
diameter of approximately
190 mm.
2. Temperature
of the oven and vessel
The oven and the empty vessel are at ambient
temperature
prior to the start of the test.
3. Temperature
of the water
The initial temperature
of the water is (10 + 2)"C.
4. Select the initial
and final water temperature
so that the maximum
difference
between
the final
water temperature
and the ambient
temperature
is 5°C.
5. Select stirring
devices and measuring
instruments
in order to minimize
addition
or removal of
heat.
6. The graduation
of the thermometer
must be scaled
by 0.1 "C a.
thermometer.
7. The water load must be (1000
+ 5) g.
8. "t" is measured while
the microwave
generator
is operating
at fu
heat-up
time is not included.
NOTE:
The operation
time of the microwave
oven is "t + 2" sec.
heat-up
time.
Measuring
method:
t minimum
and an accurate
I power.
Magnetron
filament
2 sec. is magnetron
filament
1. Measure the initial temperature
of the water before the water is added to the vessel.
(Example:
The initial
temperature
Tl
= 11 "C)
2. Add the 1 litre water to the vessel.
3. Place the load on the centre of the shelf.
4. Operate the microwave
oven at HIGH for the temperature
of the water rises by a value A T of
(10 + 2)"C.
5. Stir the water to equalize
temperature
throughout
the vessel.
6. Measure the final water temperature.
(Example:
The final temperature
T2 = 21 "C)
7. Calculate
the microwave
power output
.FJ in watts from above formula.
9
Advertisement
Table of Contents
