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NOTE: The U. S. Government standard is 5 mW/cm
2
while
in the customer's home. 2 mW/cm
2
stated here is our own
voluntary standard. (1 mW/cm
2
for Canada)
21.1. Equipment
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 shown in Figure no faster than 1 inch/sec (2.5
cm/sec).
3. Leakage with the outer panel removed — less than 5
mW/cm
2
.
4. Leakage for a fully assembled oven with door normally
closed — less than 2 mW/cm
2
(1 mW/cm
2
for Canada).
5. Leakage for a fully assembled oven [Before the latch switch
(primary) is interrupted] while pulling the door — less than
2 mW/cm
2
.
1. Pour 275± 15cc (9ozs ± 1/2oz) of 20 ± 5°C (68± 9°F) water
in a beaker which has graduations to 600cc, and place in
the center of the oven.
2. Set the radiation monitor to 2450MHz and use it following
the manufacture's recommended test procedure to assure
correct results.
3. When measuring the leakage, always use the 2 inch (5 cm)
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.
1. Measurement with the outer pane 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 when measuring around the
magnetron.
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.
21.2. Record keeping and
notification after measurement
1. 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.
2. Should the radiation leakage be more than 2 mW/cm2 (1
mW/cm2 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 PHCC, PSC or PCI.
21.3. At least once a year, have the
radiation monitor checked for
calibration by its
manufacturer.
21 PROCEDURE FOR MEASURING MICROWAVE ENERGY
LEAKAGE
33
NE-1257R/NE-1257CR / NE-1757R/NE-1757CR / NE-2157R/NE-2157CR / NE-1258