MEASUREMENT WITH THE OUTER CASE REMOVED
(1)When you replace the magnetron, measure for microwave energy leakage before the outer case is installed and after all necessary components are replaced or adjusted. Special care should be taken in measuring the following parts.
-Around the magnetron
-The waveguide
WARNING: AVOID CONTACTING ANY HIGH VOLTAGE PARTS.
MEASUREMENT WITH A FULLY ASSEMBLED OVEN
(1)After all components, including the outer panels, are fully assembled, measure for microwave energy leakage around the door viewing window, the exhaust opening and air inlet openings.
(2)Microwave energy leakage must not exceed the values prescribed below.
NOTE:
Leakage with the outer panels removed - less than 5 mW/cm2
Leakage for a fully assembled oven (“Before the latch switch (primary) is interrupted”) with the door in a slightly opened position - less than 2 mW/cm2 .
NOTE WHEN MEASURING
(1)Do not exceed meter full scale deflection.
(2)The test probe must be removed no faster than 1 inch/sec (2.5cm/sec) along the shaded area, otherwise a false reading may result.
(3)The test probe must be held with the grip portion of the handle. A false reading may result if the operator hand is between the handle and the probe.
(4)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.
RECORD KEEPING AND NOTIFICATION AFTER MEASUREMENT
(1)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.
(2)Should the microwave energy leakage not be
more than 2 mW/cm2 after determining that all parts are in good condition, functioning properly and genuine replacement parts which are listed in this manual have been used.
(3)At least once a year, have the electromagnetic energy leakage monitor checked for calibration by its manufacturer.
POWER OUTPUT MEASUREMENT
(1)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.
(2)The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 1/8” (3 mm) and an outside diameter of approximately 7.6” (190mm).
(3)The oven and the empty vessel are at ambient temperature prior to the start of the test.
(4)The initial temperature (T1) of the water is
(10±2)°C(50°F) 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.
(5)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.
(6)The microwave power output P in watts is calculated from the following formula :
P = | 4187 x (∆T) | |
T | ||
|
is measured while the microwave generator is operating at full power. Magnetron filament
(7)The water is stirred to equalize temperature throughout the vessel, prior to measuring the final water temperature.
(8)Stirring devices and measuring instruments are selected in order to minimize addition or removal of heat.
WATER LOAD
TURNTABLE
