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Measurement of Microwave Power Output
Microwave power output measurement is made with
the microwave oven supplied at its rated voltage and
operated at its maximum microwave power setting with
a load of (1000 ± 5)g potable water.
The water is contained in a cylindrical borosilicate
glass vessel having a maximum material thickness of
3 mm and an outside diameter of approximately
190mm.
The oven and the empty vessel are at ambient
temperature prior to the start of the test.
The initial temperature (T1) of the water is (10±2)°C. 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
turntable which is in the lowest position and the
microwave power switched on.
The time T for the temperature of the water to rise by a
value ∆T of (10±2)°K is measured, where T is the time
in seconds and ∆T is the temperature rise. The initial
and final water temperatures are selected so that the
maximum difference between the final water tempera-
ture and the ambient temperature is 5°K.
Disassembly and Adjustment
A. OUT CASE REMOVAL
1) Disconnect power supply cord from the outlet.
2) Remove the screws from the rear and along side
egges of the case.
The ouer case must be moved backward to the lifted
off.
B. POWER SUPPLY CORD
1) Remove the out case.
2) Disconnect two terminals, and remove one screw of
the earth terminal.
CAUTION: DISCHARGE THE HIGH VOLTAGE
CAPACITOR BEFORE SERVICING
(refer to page 5)
C. CONTROL PANEL ASSEMBLY
1) Disconnect the leadwire from the PCB SUB ASS'Y.
2) Remove the screws for the earth and securing the
control panel.
3) Lift control panel ASS'Y from the oven by the tab
unhooked.
The microwave power output P in watts is calculated
from the following formula:
P =
is measured while the microwave generator is op
erating at full power. Magnetron filament heat-up
time is not included. (about 3 sec.)
The water is stirred to equalize temperature
throughout the vessel, prior to measuring the final
water temperature.
Stirring devices and measuring instruments are
selected in order to minimize addition or removal of
heat.
Water Load
15
4187 X ∆T
T
Turn Table
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