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27
Measuring RF Leakage for Microwave Safety
WARNING: Procedure requires work while
the oven and water loads are hot. As a result,
exercise extreme caution when testing.
An RF (microwave) leakage test must be performed
at the conclusion of the following service tasks:
- Door removal, replacement and/or adjustment
- Wave guide removal and /or replacement
- Magnetron removal and/or replacement
- Door gasket
WARNING: If the unit fails the microwave
leakage test (leakage greater than 5mW/cm
2
),
the oven must be taken out of service immediately
until the defect is corrected. In addition, the CDRH
Regulation 21 Subpart C, 1002.20 requires that leak-
age readings of over 5mW/cm
2
must be reported to
the manufacturer.
To measure RF leakage,
1. Place the oven in
WARMING UP MODE (page 11)
and allow it to warm up to the set temperature
(approximately 15 minutes if the oven starts
cold).
2. Once the oven has warmed up, place the oven
in
TEST MODE (see page 15). From TEST MODE,
select “MFG Mode.”
3. From the Manufacturing Mode screen, select
“MW Leak Test” and follow the instructions on
the screen (also detailed in following steps).
4. Place a water load into the cook cavity. Water
load must conform to the following
specifications:
- Volume: 275 ml ± 15 ml
- Temperature: 68
º
F ± 9
º
F (20
º
C ± 5
º
C)
- Vessel: Low form, 600 ml beaker with an
inside diameter of approximately 3.35" (85
mm) and made of Pyrex or equivalent.
Figure 27: Counter Balance Adjustment
Step 3
Step 3
Step 4
Step 4
Step 5 = Loosen,
Step 7 = Tighten,
Step 8 = Loosen Slightly
Step 6: Notch should rest
against side of bracket.
Step 6: Thin side of spacer fits
between screw and bracket.