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MEASUREMENT OF MICROWAVE POWER OUTPUT
• Microwave power output measurement is made with
• Microwave power output measurement is made with
• Microwave power output measurement is made with
• Microwave power output measurement is made with
the microwave oven supplied at its rated voltage and
the microwave oven supplied at its rated voltage and
the microwave oven supplied at its rated voltage and
the microwave oven supplied at its rated voltage and
operated at its maximum microwave power setting with
operated at its maximum microwave power setting with
operated at its maximum microwave power setting with
operated at its maximum microwave power setting with
a load of (1000±5) g of potable water.
a load of (1000±5) g of potable water.
a load of (1000±5) g of potable water.
a load of (1000±5) g of potable water.
• The water is contained in a cylindrical borosilicate glass
• The water is contained in a cylindrical borosilicate glass
• The water is contained in a cylindrical borosilicate glass
• The water is contained in a cylindrical borosilicate glass
vessel having a maximum material thickness of 3 mm
vessel having a maximum material thickness of 3 mm
vessel having a maximum material thickness of 3 mm
vessel having a maximum material thickness of 3 mm
and an outside diameter of approximately 190mm.
and an outside diameter of approximately 190mm.
and an outside diameter of approximately 190mm.
and an outside diameter of approximately 190mm.
• The oven and the empty vessel are at ambient
• The oven and the empty vessel are at ambient
• The oven and the empty vessel are at ambient
• The oven and the empty vessel are at ambient
temperature prior to the start of the test.
temperature prior to the start of the test.
temperature prior to the start of the test.
temperature prior to the start of the test.
• The initial temperature (T1) of the water is (10±2)°C It
• The initial temperature (T1) of the water is (10±2)°C It
• The initial temperature (T1) of the water is (10±2)°C It
• The initial temperature (T1) of the water is (10±2)°C It
is measured immediately before the water is added to
is measured immediately before the water is added to
is measured immediately before the water is added to
is measured immediately before the water is added to
the vessel. After addition of the water to the vessel,
the vessel. After addition of the water to the vessel,
the vessel. After addition of the water to the vessel,
the vessel. After addition of the water to the vessel,
the load is immediately placed on the center of the
the load is immediately placed on the center of the
the load is immediately placed on the center of the
the load is immediately placed on the center of the
ceramic plate which is in the lowest position and the
ceramic plate which is in the lowest position and the
ceramic plate which is in the lowest position and the
ceramic plate which is in the lowest position and the
microwave power switched on.
microwave power switched on.
microwave power switched on.
microwave power switched on.
• The time T for the temperature of the water to rise by a
• The time T for the temperature of the water to rise by a
• The time T for the temperature of the water to rise by a
• The time T for the temperature of the water to rise by a
value
value
value
value
∆ T of (10±2)°K is measured, where T is the time
∆ T of (10±2)°K is measured, where T is the time
∆ T of (10±2)°K is measured, where T is the time
∆ T of (10±2)°K is measured, where T is the time
in seconds and ∆ T is the temperature rise. The initial
in seconds and ∆ T is the temperature rise. The initial
in seconds and ∆ T is the temperature rise. The initial
in seconds and ∆ T is the temperature rise. The initial
and final water temperatures are selected so that the
and final water temperatures are selected so that the
and final water temperatures are selected so that the
and final water temperatures are selected so that the
maximum difference between the final water
maximum difference between the final water
maximum difference between the final water
maximum difference between the final water
temperature and the ambient temperature is 5°K.
temperature and the ambient temperature is 5°K.
temperature and the ambient temperature is 5°K.
temperature and the ambient temperature is 5°K.
DISASSEMBLY AND ADJUSTMENT
A. OUTER CASE REMOVAL
1) Disconnect the power supply cord from the outlet.
1) Disconnect the power supply cord from the outlet.
1) Disconnect the power supply cord from the outlet.
1) Disconnect the power supply cord from the outlet.
2) Remove the screws from the rear of the case.
2) Remove the screws from the rear of the case.
2) Remove the screws from the rear of the case.
2) Remove the screws from the rear of the case.
The outer case must be moved backward to be lifted
The outer case must be moved backward to be lifted
The outer case must be moved backward to be lifted
The outer case must be moved backward to be lifted
off.
off.
off.
off.
B. POWER SUPPLY CORD
1) Remove the outer case.
1) Remove the outer case.
1) Remove the outer case.
1) Remove the outer case.
2) Disconnect two terminals, and remove one screw of
2) Disconnect two terminals, and remove one screw of
2) Disconnect two terminals, and remove one screw of
2) Disconnect two terminals, and remove one screw of
the ground terminal.
the ground terminal.
the ground terminal.
the ground terminal.
C. CONTROL PANEL ASSEMBLY
1) Open the door.
1) Open the door.
1) Open the door.
1) Open the door.
2) Remove the screw for securing the
2) Remove the screw for securing the
2) Remove the screw for securing the
2) Remove the screw for securing the
control panel.
control panel.
control panel.
control panel.
3) Disconnect the leadwire from the timer motor.
3) Disconnect the leadwire from the timer motor.
3) Disconnect the leadwire from the timer motor.
3) Disconnect the leadwire from the timer motor.
4) Lift up and pull out control panel assembly carefully
4) Lift up and pull out control panel assembly carefully
4) Lift up and pull out control panel assembly carefully
4) Lift up and pull out control panel assembly carefully
from the cavity.
from the cavity.
from the cavity.
from the cavity.
CAUTION: DISCHARGE THE HIGH VOLTAGE
CAPACITOR BEFORE SERVICING
(refer to page 2-1)
(refer to page 2-1)
(refer to page 2-1)
(refer to page 2-1)
• The microwave power output P in watts is calculated
• The microwave power output P in watts is calculated
• The microwave power output P in watts is calculated
• The microwave power output P in watts is calculated
from the following formula :
from the following formula :
from the following formula :
from the following formula :
4187 x (∆ T)
4187 x (∆ T)
4187 x (∆ T)
4187 x (∆ T)
P =
P =
P =
P =
is measured while the microwave generator is
is measured while the microwave generator is
is measured while the microwave generator is
is measured while the microwave generator is
operating at full power. Magnetron filament heat-up
operating at full power. Magnetron filament heat-up
operating at full power. Magnetron filament heat-up
operating at full power. Magnetron filament heat-up
time is not included. (about 3 sec)
time is not included. (about 3 sec)
time is not included. (about 3 sec)
time is not included. (about 3 sec)
• The water is stirred to equalize temperature throughout
• The water is stirred to equalize temperature throughout
• The water is stirred to equalize temperature throughout
• The water is stirred to equalize temperature throughout
the vessel, prior to measuring the final water
the vessel, prior to measuring the final water
the vessel, prior to measuring the final water
the vessel, prior to measuring the final water
temperature.
temperature.
temperature.
temperature.
• Stirring devices and measuring instruments are
• Stirring devices and measuring instruments are
• Stirring devices and measuring instruments are
• Stirring devices and measuring instruments are
selected in order to minimize addition or removal of
selected in order to minimize addition or removal of
selected in order to minimize addition or removal of
selected in order to minimize addition or removal of
heat.
heat.
heat.
heat.
WATER LOAD
Lift up and pull out control panel
5-3
T
T
T
T
CERAMIC PLATE
Remove the screw
securing
screw
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