Sharp SMO1854DS Service Manual

21
MEASUREMENT AND TEST
✻ Heating time for power output: (T
2
= T
0
)
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. A cylindrical container of borosilicate glass is used for the test. It has a maximum thickness of 0.12", an external
diameter of approximately 7.48" and a height of approximately 3.54".
The mass of the container is determined.
2. At the start of the test, the oven and the empty container are at ambient temperature. Water having an initial
temperature of 10˚C ± 1˚C is used for the test. The water temperature is measured immediately before it is poured
into the container.
3. A quantity of 1000g ± 5g of water is added to the container and its actual mass obtained.
The container is then immediately placed in the centre of the oven shelf, which is in its lowest normal position.
The oven is operated and the time for the water
temperature to attain 20˚C ± 2˚C is measured. The
oven is then switched off and the final water
temperature is measured within 60 seconds.
NOTE 1 - The water stirred is before its temperature is
measured.
NOTE 2 - Stirring and measuring devices are to have a
low heat capacity.
4. The microwave power output is calculated from the
formula
where
P is the microwave power output, in watts ;
m
w is the mass of the water, in grams ;
mc is the mass of the container, in grams ;
T0 is ambient temperature, in degrees Celsius ;
T1 is the initial temperature of the water, in degree Celsius ;
T2 is the final temperature of the water, in degrees Celsius ;
t is the heating time, in seconds, excluding the magnetron filament heating-up time.
CAUTION
1. Water load should be measured exactly to 1 liter (33.8 oz).
2. Input power voltage should be exactly specified voltage (Refer to SPECIFICATIONS).
3. Ambient temperature should be 20 ± 2°C (68 ± 3.6°F)
P = {4.187 • mw (T2-T1) + 0.55 • mc (T2-T0)}/t
A (second) 70 64 60 56 52 49 47 44 42 40 38 36 35
B (W) 600 650 700 750 800 850 900 950 1000 1050 1100 1150 1200

Sharp SMO1854DS Specifications

General

Style	over the range
Color	stainless steel
Total Capacity	1.8 cu. ft.
Convection	no
Power Levels	10
Fan Speeds	3
Venting Type	non ducted
Sensor Cooking	yes
Quick Start	yes (1-6 minutes)
Control Type	touch control
Child Lock	yes
Timer	yes
Interior Light	led; yes
Microwave Power	1, 100 watts

Weight and Dimensions

Depth	15 9/10 inch
Height	16 3/10 inch
Width	29 9/10 inch