CAUTION
For microwave energy emission
On every service call. A check for micro-
wave energy emission must be made
according to the following manner.
Measurement of energy emission
Measurement must be made with the microwave oven
operating at its maximum output and containing a load
of 275
±
15 milliliters of tap water initially at 20
°±
5
°
celsius (68
±
9
°
F) placed within the cavity at the center.
NOTE:The water container must be a 600 milliliter bea-
ker and made of an electrically none conduc-
tive material such as glass or plastic.
The cook tray must be in place when measuring
emission.
A properly operating door and seal assembly will nor-
mally register emission no greater than 4 mW/cm
2
to
allow for measurement uncertainty with the cooking
shelf or tray in place.
All repairs must be performed in such a
manner that microwave energy emission
is minimal.
Follow the instructions supplied with the detector be-
ing used and perform an R.F. emission test around the
door front, and all edges and vent of the outer case.
The cabinet (wrapper) must be in place and the oven
fully assembled.
When performing an emission survey, with the meter
on FAST RESPONCE, the movemtnt of detector probe
shall not exceed one (1) inch per second.
In the area emitting the highest reading, switch the
meter to SLOW RESPONSE and take a reading for
minimum of three (3) seconds. We recommended the
pattern outline shown below when the door surface is
surveyed.
NOTE: Periodically check to be sure that the probe tip
is not worn or dirty.
The following U.S. standard applies to microwave ov-
ens:
21 CFR 1030.10, Performance Standard for Microwave
Ovens.
It requires that the power density of the microwave
radiation emitted by a microwave oven shall not ex-
ceed five (5) milliwatts per square centimeter at any
point 5 centimeters (about 2 inches) or more from the
external surface of the oven.
All microwave ovens exceeding the emission level of 4
mW/cm
2
must be reported to Dept. of Service for mi-
crowave ovens and the manufacturer immediately .
The owner should be told not to use the microwave
oven until it has been repaired completely.
If a microwave oven is found to operate with the door
open, report to Dept. of Service, the manufacturer and
CDRH* immediately. Also tell the owner not to use the
oven.
*CDRH: Center for Device and Radiological Health.
The interlock monitor switch acts as the final safety
switch protecting the customer from microwave radia-
tion. If the interlock monitor switch operates properly
and the door interlocs switch fails, the fuse will blow.
If this happens, all interlock switches must be replaced.
The contacts of the interlock switches may be welded
together.
