MICROWAVE MEASUREMENT
After adjustment of door latch switches, monitor switch
and doorare 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 require-
ments of the performance standard for microwave oven.
REQUIREMENT
The safety switch must prevent microwave radiation emis-
sion in excess of 5mW/cm* at any point 5cm or more from
external surface ofthe oven.
PREPARATION FOR TESTING:
Before beginning the actual test for leakage, proceed as fol-
lows;
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
instrumentations as prescribed by the performance stan-
dard for microwave ovens must be used for testing.
Recommended instruments are:
NARDA 8100
NARDA 8200
HOLADAY HI 1500
SIMPSON 380M
2. Place the oven tray into the oven cavity.
3. Place the load of 275 +15ml of water initially at 20
+5X in the center of the oven tray. The water con-
tainer should be a low form of 600 ml beaker with in-
side diameter of approx. 8.5cm and made of an elec-
trically non-conductive material such as glass or
plastic.
The placing of this standard load in the oven is im-
portant not only to protect the oven, but also to in-
sure 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 cool water.
5. Move the probe slowly (not faster that 2.5cm/sec.)
along the gap.
6. The microwave radiation emission should be meas-
ured at any point of 5cm or more from the external
surface of the oven.
Microwave leakage measurement at 5 cm distance
38
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