MICROWAVE MEASUREMENT
After the adjustment of the door interlock switches and
door is completed individually or collectively, the follow-
ing leakage test must be performed with a survey
instrument and it must be confirmed that the result meets
the requirements of the performance standard for micro
wave oven.
The safety switch must prevent microwave radiation
emission in excess of
at any point
or more
from external surface of the oven
Before beginning the actual test for leakage, proceed as
1.
Make sure that the test instrument is operating
normally as specified in its instruction booklet.
Important:
Survey instruments that comply with the requirement
for instrumentation as prescribed by the performance
standard for microwave ovens must be used for
testing.
Recommended instruments are:
NARDA 8 100
NARDA 8200
HOLADAY HI 1500
SIMPSON 380M
2.
Place the turntable tray into the oven cavity.
3. Place the load of 275
of water with the
addition of one (1) percent by weight of sodium
chloride in solution initialy at 20
in the centre
of the over tray. The water container should be a low
form of 600ml beaker with inside diameter of
approx.
and made of an electrically non-
conductive material such as glass or plastic.
The placing of this standard load in the oven is
important not only to protect the oven, but also to
insure that any leakage is measured accurately.
4.
Close the door and turn the oven ON with the timer
set for several minutes. If the water begins to boil
before the survey is completed, replace it with
of the cool salt water.
5. Move the probe slowly (not faster than
along the gap.
6. The microwave radiation emission should be mea-
sured at any point of
or more from the external
surface of the oven.
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