MICROWAVE MEASUREMENT
After the adjustment of door interlock switches and
door
is completed individually or collectively, the following le
akage
test
must
must be performed wi
th a survey
instrument and
it
be confirmed that the
result meets
the requirements
of
the performance standard for microwave oven.
REQUIREMENT
The safety switch must prevent microwave radiation emission
in excess of 5mW/cm2 at any point 5cm or more from external
surface of the oven.
PREPARATION FOR THE TESTING:
Before beginning the actual test for leakage, proceed as
follows;
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 8100
NARDA 8200
HOLADAY HI 1500
SIMPSON 380M
2. Place the turntable tray into the oven cavity.
3. Place the load of 275 f 15ml of water initially at 20 i: 5’C
in the centre of the oven tray. The water container should
be a low form of 600ml beaker with inside diameter of
approx. 8.5cm and made of an electrically nonconductive
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 275ml of the cool
water.
5. Move the probe slowly (not faster than 2.5cm/sec.i along
the gap.
6. The microwave radiation emission should be measured at
any point of 5cm or more from the external surface of the
oven.
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