5-3
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 of 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 thd 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
temperature and the ambient temperature is 5°K.
4187 x (
∆
T) + 0.55 X (T
2
- T
0
) X M
T
• T
2
: Temperature after heating
• T
0
: Temperature of bowl
• M: Weight of bowl
is measured while the microwave generator is
operating 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
TURNTABLE
P =
• The microwave power output P in watts is calculated
from the following formula :
NOTES:
For simple tests of micromave power output,
it by heating one litre water for one minute,
minimum temperature rise should be 6 C
conduct
°
DISASSEMBLY AND ADJUSTMENT
A. OUTER CASE REMOVAL
1) Disconnect the power supply cord from the outlet.
2) Remove the screws from the rear and along side
edges of the case.
The outer case must be moved backward to be lifted
off.
C. CONTROL PANEL ASSEMBLY
1) Disconnect the leadwire from the Timer motor
2) Remove the screws for securing the control panel.
3) Lift control panel ASS ’Y from the oven by the tab
unhooked.
B. POWER SUPPLY CORD
1) Remove the outer case.
2) Disconnect two terminals, and remove one screw of
the earth terminal.
CAUTION: DISCHARGE THE HIGH VOLTAGE
CAPACITOR BEFORE SERVICING
(refer to page 2-1)
Summary of Contents for NN-ST342M
Page 9: ...SCHEMATIC DIAGRAM 4 3...
Page 29: ...6 2 DOOR PARTS D04 05 S03 D06 01 05 08 D03 D 1 2 3 4 5 6 7 8...
Page 30: ...6 3 CONTROL PANEL PARTS C 05 C18 S03 C01 C55 C 11 15 12 9 10...
Page 31: ...6 4 OVEN CAVITY PARTS 21 25 24 27 26 19 22 64...
Page 32: ...6 5 LATCH BOARD PARTS 28 29 29 30 32...
Page 33: ...INTERIOR PARTS 6 6 34 37 38 39 40 41 42 43 44 45 48...
Page 34: ...6 7 BASE PLATE PARTS 49 50 51 52 54 55 63 58 58 58 58...
Page 40: ......
