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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.,
REQUIREMENT
The
safety
switch
must
prevent
microwave
radiation
emission in excess of SmW/cm' at any point Scm 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.
2.
3.
4.
5.
6.
Recommended
instruments
are:
NARDA 8 100
NARDA 8200
HOLIDAY
HI 1500
SIMPSON 38OM
Place the turntable
tray into the oven cavity.
Place the load of 275 f lSm1 of water
with
the
addition
of one (1) percent
by weight
of sodium
chloride in solution initialy
at 20 *S°C in the centre
of the oven tray. The water container
should be a low
form
of
6OOml beaker
with
inside
diameter
of
approx.
8&m
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.
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 salt water.
Move the probe slowly (not faster than 2Scm/sec.)
along the gap.
The microwave
radiation
emission
should
be mei-
sured at any point of 5cm or more from the external
surface of the oven.
33
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