Viking DMOC205SS - Manual (Page 37)

35
DMOC205SS
VMOC205SS
MICROWAVE MEASUREMENT PROCEDURE
Leakage test:
Leakage Test with Enclosure Installed.
1. Grasp the probe of the survey instrument and hold it
perpendicular to the gap between the door and the body
of the oven.
2. Move the probe slowly, not faster than 2.5cm/sec. along
the gap, watching for the maximum indication on the
meter.
3. Check for leakage at the door screen, sheet metal
seams and other accessible positions where the
continuity of the metal has been breached (eg., around
the switches, indicator, and vents).
4. Measure carefully at the point of highest leakage and
make sure that the highest leakage is no greater than
4mW/cm
2 , and that the primary interlock switch does
turn the oven OFF before any door movement.
Leakage Test without Enclosure.
1. Remove the enclosure (cabinet).
2. Grasp the probe of the survey meter and hold it
perpendicular to all mechanical and eleeectronic parts
of the oven that is accessible to the user of the oven
including, but not limited to, the waveguide, cavity,
cavity seams, magnetron and magnetron to waveguide
connection.
3. Move the probe slowly (not faster than 2.5cm/sec.),
watching for the maximum indication on the meter.
4. Measure carefully at the point of highest leakage and
make sure that the highest reading is under the required
limit as mentioned above.
CAUTION !
Special attention should be given to avoid electrical
shock because HIGH VOLTAGE is generated during
this test.
No Load Test
1. Operate the oven without a load and mesure the leakage
by the same method as the above test procedure “A.
Test Enclosure Installed”.
2. Make sure that the highest leakage should not exceed
5mW/cm 2 .
Note: Do not perform this test for extended periods.
After adjustment of the door, interlock and monitor switches
are completed individual or collectively, interlock switch
test and microwave leakage test must be performed with
survey instrument and test results must be confirmed to
meet the requirement of the performance standard for
microwave ovens as undermentioned.
Requirement
Every microwave oven shall function in such a manner that
when the oven is fully assembled and operating with it’s
service controls and user controls adjusted to yield the
maximum output, the leakage radiation, at all points at least
5 cm. from the external surface of the oven, does not
exceed:
1. 1.0mW/cm 2 with the test load, 275±15ml of water at an
initial temperature of 20±5
ο
C.
2. 5.0mW/cm 2 when the outer enclosure is removed with a
test load of 275±15ml water at an initial temperature of
20±5
ο
C.
3. 5.0mW/cm 2 without a test load.
Preparation For Testing:
Before beginning the actual measurement of leakage,
proceed as follows:
1. Make sure that the actual instrument is operating normally
as specified in its instruction booklet.
Note: Survey instruments that comply with the requirement
for instrumentation as prescribed by CSA and NHW
performance standard for microwave ovens must
be used for testing.
Recommended instruments are:
NARDA 8100
NARDA 8200
2. Place the oven tray in the oven cavity.
3. Place the load of 275±15 ml of tap water initially at
20±5
ο
C in the center of the oven cavity.
The water container shall be a low form of 600 ml beaker
with an inside diameter of approx. 8.5 cm 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 set the time cooking for several
minutes. And start the oven. If the water load is depleted
replace it.