Daewoo KOT-170S0A, Service Manual

Page: 35 / 70

34
MEASUREMENT AND TEST
CAUTION :
1. Water load should be measured exactly to 1 liter.
2. Input power voltage should be exactly 120V as specified.
3. Ambient temperature should be 20±2˚C(68 ±3.6˚F)
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 with the microwave oven supplied at rated voltage and operated at its
maximum microwave power setting with a load 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.
Heating time should be exactly 38 sec.
Heating times is measured while the microwave Generator is
operating at full power. The filament Heat-up time for mag-
netron is not included.
5. The initial and final water temperature are selected so that the
maximum difference between the ambient and final water
temperature is 5˚C.
6. The microwave power output P in watts is calculated from the
following formula.
•
▲ ▲
T is actual temperature rise.
• t is the heating time.
The power measured should be 1100W ±10%.
P=4187 X
▲ ▲
T/t