PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE
WARNING
Check for radiation leakage after every servicing. Should
the leakage be more than 2 mW/cm
2
. After repairing
or replacing any radiation safety device, keep a written
record f o r future reference, the leakage reading
must be recorded on the service repair ticket while in
the customer’s home.
1. Equipment
*Electromagnatic radiation monitor
*Glass thermometer 212˚F or 100˚C
*600cc glass beaker
2. Procedure for measuring radiation leakage
Note before measuring.
(1) Do not exceed meter full scale deflection. Leakage monitor
should initially be set to the highest scale.
(2) To prevent false readings the test probe should be held by the
grip portion of the handle only and moved along the shaded area
in Figure no faster than 1 inch/sec (2.5cm/sec).
(3) Leakage with the outer panel removed ...... less than 5mW/cm
2
.
(4) Leakage for a fully assembled oven with door normally closed
...... less than 2mW/cm
2
(1mW/cm
2
for Canada).
(5) Leakage for a fully assembled oven [Before the latch switch
(primary) is interrupted] while pulling the door ...... less than
2mW/cm
2
.
(A) Pour 275
±
15cc (9ozs
s
±
1/2oz) of 20˚
±
5˚C (68˚
±
9˚F) water in a
beaker which is graduated to 600cc, and place in the center of the
oven.
(B) Set the radiation monitor to 2450MHz and use it following the
manufacturer’s recommended test procedure to assure correct
results.
(C) When measuring the leakage, always use the 2 inch (5cm) spacer
supplied with the probe.
(D) Tap the start pad or set the timer and with the magnetron oscillating,
measure the leakage by holding the probe perpendicular to the
surface being measured.
(1) Measurement with the outer panel removed.
Whenever you replace the magnetron, measure for radiation leakage
before the outer panel is installed and after all necessary components
are replaced or adjusted. Special care should be taken in measur
ing around the magnetron.
WARNING
(2) Measurements with a fully assembled oven.
After all components, including outer panel are fully assembled,
measure for radiation leakage around the door periphery, the
door viewing window, the exhaust opening and air inlet openings.
3. Record keeping and notification after measurement
After any adjustment or repair to a microwave oven, a leakage read-
ing must be taken. Record this leakage reading on the repair ticket
even if it is zero.
A copy of this repair ticket and the microwave leakage reading should
be kept by repair facility.
4. At least once a year, have the radiation monitor
checked for calibration by its manufacturer.
Avoid contacting any high voltage parts.
- 21 -
WARNING
AVOID CONTACTING ANY HIGH VOLTAGE PARTS.
MOVE PROBE ALONG SHADED
AREA( )AROUND EXHAUST
OPENINGS(as shown)AND AROUND
AIR INLET OPENING
