Measurement With A Fully Assembled Oven; Record Keeping And Notification After Measurement - LG MH-1355M Service Manual

MEASUREMENT WITH A FULLY
ASSEMBLED OVEN
• After all components, including the outer case are
fully assembled, measure for microwave energy
leakage around the door viewing window, the
exhaust opening and air inlet openings.
• Microwave energy leakage must not exceed the
values prescribed below.
NOTES:
Leakage with the out case removed - less than 4
mW/cm 2 .sq.
Leakage for a fully assembled oven ("Before the latch
switch (primary) interrupted") with the door in a
slightly opened position-less than 2 mW/cm
NOTE WHEN MEASURING
• Do not exceed meter full scale deflection.
• The test probe must be removed no faster than 1
inch/sec (2.0 cm/sec) along the shaded, otherwise a
false reading may result.
• The test probe must be held with the grip portion of
the handle.
A false reading may result if the operator's hand is
between the handle and the probe.
• When testing near a corner of the door, keep the
probe perpendicular to the surface making sure the
probe horizontally along the oven surface, this may
possibly cause probe damage.
• When high leakage is suspected, do not move the
probe horizontally aiong the oven surface, this may
possibly cause damage.
RECORD KEEPING AND NOTIFICATION
AFTER MEASUREMENT
• After adjustment and repair of any microwave
energy interruption or microwave energy blocking
device, record the measured values for future
reference. Also enter the information on the service
invoice.
• Should the microwave energy leakage not be more
than 2 mW/cm .sq. after determining that all parts
2
are in good condition, functioning properly and
genuine replacement parts which are listed in this
manual have been used.
• At least once a year, have the electromagnetic
energy leakage monitor checked for calibration by
its manufacturer.
DETERMINATION OF 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) cc 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
temperature prior to the start of the test.
• The initial temperature 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,
2 .sq.
the load is immediately placed on the center of the
Glass Tray 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
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.
• The microwave power output P in watts is calculated
from the following formula:
is measured while the microwave generator is
operating at full power. Magnetron filament heat-up
time is not included.
• 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.
– 43 –
∆T of (10±2) K is measured, where T is the
4187 x (∆T) + 0.55 X (T
P =
T
• T : Temperature after heating
2
• T : Temperature of bowl
0
• M : Weight of bowl
WATER LOAD
-T )X M
2 0
GLASS TRAY
Fig. 44