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/cm2 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 RESPONSE, the movement of the 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/cm2 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 interlock 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.
