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9. MEASUREMENT AND TEST
9-1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT
Microwave output power can be checked by indirectly measuring the temperature rise
of a certain amount of water exposed to the microwave as directed below.
PROCEDURE
1. Microwave power output measurement is made wit the microwave oven supplied
at rated voltage and operated at its maximum microwave power setting with a
load of 1000 ± 5cc of potable water.
2. The water is contained in a cylindrical borosilicate glass vessel having a maximum
material thickness of 3 mm and an outside diameter of approximately 190 mm.
3. The oven and the empty vessel are at ambient temperature prior to the start of
the test. The initial temperature of the water is 10 ± 2 °C (50 ± 3.6 °F). It is
measured immediately before the water is added to the vessel. After addition of
the water to the vessel, the load is immediately placed on the center of the shelf,
which is in the lowest normal position.
4. Microwave power is switched on.
5. Heating time should be exactly A
seconds (Refer to table as following).
Heating time is measured while the
microwave generator is operating at
full power. The filament heat-up time
for magnetron is not included.
6. The initial and final temperature of
water is selected so that the maximum
difference between the ambient and
final water temperature is 5K.
7. The microwave power output P in
watts is calculated from the following formula:
· DT is difference between initial and ending temperature.
· t is the heating time.
The power measured should be B (Refer to 2. SPECIFICATIONS) W ± 10.0 %.
* Heating time for power output:
A (second) 70 64 60 56 52 49 47 44 42 40 38
B (W) 600 650 700 750 800 850 900 950
1000 1050 1100
P = 4187 x DT/t
CAUTION :
1. Water load should be measured exactly to 1 liters.
2. Input power voltage should be exactly specified voltage
(Refer to 2. SPECIFICATIONS).
3. Ambient temperature should be 20 ± 2 °C (68 ± 3.6°F)