MEASUREMENT AND TEST

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 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 imm ediately before the water is added to the vessel. After addition of

 

the water to the vessel, the load is imm ediately 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 maxim um difference between the ambient

 

 

 

 

 

 

 

 

and final water temperature is 5K .

 

 

 

 

 

 

 

 

 

7

. The microwave power output P in watts is calculated

 

 

 

 

 

 

 

 

from the following formula:

 

 

 

 

 

 

 

 

 

 

 

P = 4187 X ￿T￿￿

 

 

 

 

 

 

 

 

 

 

 

￿￿T is difference between initial and ending temperature.

 

 

 

 

 

 

 

t is the heating time.

 

 

 

 

 

 

 

 

 

 

￿

The power measured should be B (Refer to

SPECIFICATIONS) W ± 10.0 % .

 

 

 

 

CAUTION

 

 

 

 

 

 

 

 

 

 

 

 

1. W ater load should be m easured exactly to 1 liters.

 

 

 

 

 

 

 

 

2. Input pow er voltage should be exactly specified voltage (R efer to SPEC IFIC ATIO N S).

 

 

 

 

3. Am bient tem perature should be 20 ± 2° C (68 ± 3.6 ° F)

 

 

 

 

 

 

 

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

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Image 23
Daewoo KOR-631H0P Measurement and Test, Measurement of the Microwave Power Output, For magnetron is not included
Page 22 Page 24

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