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Microwave Leakage Test
In the event that magnetron, door, or hinge has been replaced or readjusted, a microwave test as follows must be preferred:
3.1
Test instruments required:
Microwave Survey Meter, Holaday Model HI-1710 or equivalent
600 ml glass beaker
3.2
Precautions
Turn the power off (or unplug the oven) immediately if the oven fails this test.
3.3
Plug the oven power cord into the power receptacle.
3.4
Turn on the Microwave Leakage Meter and warm up for at least 10 minutes. Set the meter response(filter selection)at
"FAST".
3.5
Fill the glass beaker with 275(+/- 15) ml of cold water and place the beaker in the center of the turntable glass plate.
3.6
Close the oven door. Set the timer at "5 minutes". Set the Power Level at "HIGH" or "100%" and start the operation.
3.7
Hold (by the handle portion) the probe(cone spacer)perpendicular to the areas under test for RF emissions. Move the
probe at a speed of no faster than 1 inch per second. The areas under test are:
1 )
T h e
2)
The area of the door screen.
3)
The area of control panel.
4)
The area near line cord.
5)
All vent openings.
6)
All cabinet seams.
7)
Other suspect areas.
3.8
At several locations in the vicinity of each high leakage point, hold the probe stationary until a steady state value is
reached on the Survey Meter. Observe the maximum leakage at each location
3.9
Set the Meter Response to "SLOW": remeasure the leakage at the point of maximum leakage located in Step 7.3.8 above,
record the value and location of the maximum leakage measurement with the meter response on "SLOW'.
3. 10
The maximum RF emission (leakage) should be 4.0 mW/cm2 or less. If not, investigate and repair the oven again until it
passes the test
of the door/cavity seal.
7 -2
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