Output Power Of Magnetron - Kenmore 401.85052010 Service Manual

6. Alignment and Adjustments

6-9 Output Power of Magnetron

PRECAUTION
MICROWAVE RADIATION
PERSONNEL SHOULD NOT ALLOW EXPOSURE TO MICROWAVE RADIATION FROM MICROWAVE
GENERATOR OR OTHER PARTS CONDUCTING MICROWAVE ENERGY .
The output power of the magnetron can be measured by performing a water temperature rise test .
Equipment needed :
• Two 1-liter cylindrical borosilicate glass vessel (Outside diameter 190 mm)
• One glass thermometer with mercury column
NOTE: Check line voltage under load . Low voltage will lower the magnetron output . Make all temperature and
time tests with accurate equipment .
1. Fill the one liter glass vessel with water .
2. Stir water in glass vessel with thermometer, and record glass vessel's temperature ("T1", 10±1°C) .
3. After moving the water into another glass vessel, place it in the center of the cooking tray . Set the oven to high
power and operate for 41 seconds exactly . (3 seconds included as a holding time of magnetron oscillation:)
4. When heating is finished, stir the water again with the thermometer and measure the temperature ("T2").
5. Subtract T1 from T2. This will give you the water temperature rise. (∆T)
6. The output power is obtained by the following formula;
Output Power = 4.187 x 1000 x ∆T+0.55xMcx(T2 -T1)
7. Normal temperature rise for this model is 9°C to 11°C at 'HIGH' .
NOTE 1: Variations or errors in the test procedure will cause a variance in the temperature rise . Additional power
test should be made if temperature rise is marginal .
NOTE 2: Output power in watts is computed by multiplying the temperature rise (step 5) by a factor of 91 times the
of centigrade temperature .
41
42
38
4.187
1000
∆T
To
Mc
28
:
Heating Time
: Counting Time (sec)
: Coefficient for Water
: Water (cc)
: Temperature Rise (T2-T1)
: Room Temperature
: Cylindrical borosilicate glass weight