Procedure For Measuring Microwave Energy Leakage - Panasonic NN-S251WL Service Manual

PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE

WARNING
Check for radiation leakage after every servicing.
Should the leakage be more than 2 mW/cm
PASC immediately. After repairing or replacing any
radiation safety device, keep a written record for future
reference, as required by D.H.H.S. regulation. This
requirement must be strictly observed. In addition, the
leakage reading must be recorded on the service
repair ticket while in the customer's home.
NOTE: The U.S. Government standard is 5mW/cm
in the customer s home. 2mW/cm
our own voluntary standard.
1. Equipment
• Electromagnatic radiation monitor
• Glass thermometer 212°F or 100°C
• 600cc glass beaker
2. Procedure for measuring radiation leakage
Note before measuring.
(1) Do not exceed meter full scale deflection. Leakage
monitor should initially be set to the highest scale.
(2) 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).
(3) Leakage with the outer panel removed ...... less
than 5mW/cm 2 .
(4) Leakage for a fully assembled oven with door
normally closed ...... less than 2mW/cm
for Canada).
(5) Leakage for a fully assembeld oven [Before the
latch switch (primary) is interrupted] while pulling
the door ...... less than 2mW/cm
(A) Pour 275°±15cc (9ozs°±1/2oz) of 20°±5°C (68°±9°F)
water in a beaker which is graduated to 600cc , and
place in the center of the oven.
(B) Set the radiation monitor to 2450MHz and use it
following the manufacturer's recommended test
procedeur to assure correct results.
(C) When measuring the leakage, always use the 2 inch
(5cm) spacer supplied with the probe.
2 inform
2 while
2 stated here is
(1mW/cm
2 2
2 .
7-2
(D) 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.
(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.
WARNING
Avoid contacting any high voltage parts.
(2) 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.
3. Record keeping and notification after
measurement
(A) After any adjustment or repair to a microwae 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.
(B) Should the radiation leakage be more than 2mW/cm
after determining that all parts are in good condition,
functoning properly, and genuine replacement parts
as listed in this manual have been used, immediately
notify PASC.
4. At least once a year, have the radiation
monitor checked for calibration by its
manufacturer.
Move probe along shaded area.
Probe scanning speed
Less than 2.5 cm/sec. ( 1 in/sec)
2