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6ol 0 Procedure
for Measurement
of Microwave
Energy
Leakage
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1.
Pour 275+15cc of 20+5°C(68+9°F) water in a beaker which is graduated to
600cc, and place the beaker in the center of the oven.
2.
Start to operate the oven and measure the leakage by using a microwave
energy survey meter.
3.
Set survey meter with dual ranges to 2,450MHz.
4.
When measuring the leakage, always use the 2 inch spacer cone with the
probe. Hold the probe perpendicular to the cabinet door. Place the spacer
cone of the probe on the door and/or cabinet door seam and move along
the seam, the door viewing window and the exhaust openings moving the
probe in a clockwise direction at a rate of 1 inch/sec. If the leakage testing of the cabinet door seam is taken near
a corner of the door, keep the probe perpendicular to the areas making sure that the probe end at the base of the
cone does not get closer than 5cm to any metal. If it gets closer than 5cm, erroneous readings may result.
Measured leakage must be less than 4mW/cm2, after repair or adjustment.
6-11 Check for Microwave
Leakage
1.
Remove the outer panel.
2.
Pour 275+15cc of 20+5°C(68+9°F) water in a beaker which is graduated to
600cc, and place the beaker in the center of the oven.
3.
Start the oven at the highest power level.
4.
Set survey meter dual ranges to 2,450MHz.
5.
Using the survey meter and spacer cone as described above, measure near
the opening of magnetron, the surface of the air guide and the surface of
the wave guide as shown in the following photo.( but avoid the high voltage
components.) The reading should be less than 4mW/cm2.
6-12 Note in Measurement
1.
Do not exceed the limited scale.
2.
The test probe must be held on the grip of the handle, otherwise a false reading may result when the operator's
hand is between the handle and the probe.
3.
When high leakage is suspected, do not move the probe horizontally along the oven surface; this may cause
damage to the probe.
4.
Follow the recommendation of the manufacturer of the microwave energy survey meter.
6-13 Leakage
Measuring
Procedure
6-13-1 Record
keeping
and notification
after measurement
1)
After adjustment and repair of a radiation preventing device, make a repair record for the measured values, and
keep the data.
6-13-2 At _east once a year have the microwave
energy
survey
meter checked
for
accuracy
by its manufacturer.
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