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3 PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE
3.2.1. Measurement with the outer panel removed.
Whenever you replace the magnetron, measure for radiation leakage before the outer panel is installed and after all necessary components are replaced or adjusted. Special care should be taken in measuring around the magnetron.
NOTE: The U.S. Government standard is 5 mW/cm 2 while in the customerâs home. 2mW/cm 2 stated here is our own voluntary standard. (1mW/cm2 for Canada)
Measurements with a fully assembled oven.
After all components, including outer panel are fully assembled, measure for radiation leakage around the door periphery, the door viewing window, the exhaust opening and air inlet openings.
â¢ Electromagnatic radiation monitor â¢ 600cc glass beaker
â¢ Glass thermometer 212Â°F or 100Â°C
Record keeping and notification after measurement
Procedure for measuring radiation leakage
â¢ After any adjustment or repair to a microwave oven, a leakage reading must be taken. Record this leakage reading on the repair ticket even if it is zero. A copy of this repair ticket and the microwave leakage reading should be kept by repair facility. â¢ Should the radiation leakage be more than 2 mW/cm2 (1mW/cm for Canada) after determining that all parts are in good condition, functioning properly, and genuine replacement parts as listed in this manual have been used, immediately notify PASC, PSC or PCI.
Note before measuring. â¢ Do not exceed meter full scale deflection. Leakage monitor â¢ should initially be set to the highest scale. â¢ To prevent false readings the test probe should be held by the grip portion of the handle only and moved along the shaded area in Figure no faster than 1 inch/sec (2.5cm/sec). â¢ Leakage with the outer panel removed ...... less than 5mW/cm2. â¢ Leakage for a fully assembled oven with door normally closed ...... less than 2mW/cm 2 (1mW/cm 2 for Canada). â¢ Leakage for a fully assembled oven [Before the latch switch (primary) is interrupted] while pulling the door ...... less than 2mW/cm 2. 1. Pour 275 Â± 15cc (9ozssÂ± 1/2oz) of 20Â°C Â± 5Â°C (68Â° Â± 9Â°F) water in a beaker which is graduated to 600cc, and place in the center of the oven. 2. Set the radiation monitor to 2450MHz and use it following the manufacturerÂ´s recommended test procedure to assure correct results. 3. When measuring the leakage, always use the 2 inch (5cm) spacer supplied with the probe. 4. Tap the start pad or set the timer and with the magnetron oscillating, measure the leakage by holding the probe perpendicular to the surface being measured.
At least once a year, have the radiation monitor checked for calibration by its manufacturer.