Table of Contents
Advertisement
Measurement of Microwave Power Output
Microwave power output measurement is made
with the microwave oven supplied at its rated volt-
age 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
190 mm.
The oven and the empty vessel are at ambient tem-
perature 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 shelf which is in the lowest
position and the microwave power switched on.
The time T for the temperature of the water to rise
∆ T of (10¡ 2)°K is measured, where T
by a value
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 temperature and the ambient tem-
perature 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 section. The out
case must be moved backward to the lifted off.
B. POWER SUPPLY CORD.
1) Remove the out case.
2) Disconnect two terminals from the noise filter assy
and remove one screw of the earth terminal.
CAUTION: DISCHARGE HIGH VOLTAGE
CAPACITOR BEFORE SERVICING
(refer to page 2-1)
C. CONTROL PANEL ASSEMBLY
1) Disconnect the leadwire from the PCB SUB ASM.
2) Remove one screw of the control panel.
3) Lift control panel assembly from the oven by the
tab unhooked.
The microwave power output P in watts is calculat-
ed from the following formula:
P=
is measured while the microwave generator is
operating at full power. Magnetron filament heat-up
time is not included. (about 2 sec.)
The water is stirred, to equalize temperature
throughout the vessel, prior to measuring the final
water temperature.
Stirring devices and measuring instruments are sel-
ected in order to minimize addition or removal of
heat.
Water Load
5-3
4187 (∆ T)
T
Turn Table
Advertisement
Table of Contents
