8.PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE

A. CAUTIONS

B. MEASURING MICROWAVE ENERGY LEAKAGE

(1)

Be sure to check a microwave emission prior to servicing

(1)

Pour 275±15cc of 20±5°C water in a beaker which is

(2)

the oven if the oven is operative prior to servicing.

 

graduated to 600 cc, and place the beaker in the center

The service personnel should inform the manufacturer,

(2)

of the oven.

 

importer, or assembler of any certified oven unit found to

Set the energy leakage monitor to 2,450 MHz and use it

 

have a microwave emission level in excess of

 

following the manufacturer’s recommended test

 

5mW/cm.sq. and should repair any unit found to have

(3)

procedure to assure correct result.

 

excessive emission levels at no cost to the owner and

When measuring the leakage, always use the 2 inch

 

should ascertain the cause of the excessive leakage.

(4)

(5cm) spacer supplied with the probe.

 

The service personnel should instruct the owner not to

Operate the oven at its maximum output.

 

use the unit until the oven has been brought into

(5)

Measure the microwave radiation using and

(3)

compliance.

 

electromagnetic radiation monitor by holding the probe

If the oven operates with the door open, the service

 

perpendicular to the surface being measured. (See

 

personnel should;

 

Figure 7)

 

- Tell the user not to operate the oven

 

 

 

 

 

 

 

Move probe along shaded area.

 

- Contact the manufacturer and CDRH (Center for

 

Devices and Radiological Health) immediately.

 

 

 

 

 

 

 

NOTE: Address on CDRH

 

Probe scanning speed

 

Office of Compliance (HFZ-312)

 

less than 2.5 cm/sec.

 

Center for Devices and Radiological Health

 

 

 

 

 

 

 

1390 Piccard Drive

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rockville, Maryland 20850

 

 

 

 

 

 

 

 

 

 

 

 

 

(4)The service personnel should check all surface and vent openings for microwave emission testing.

(5) Check for microwave energy leakage after every

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

servicing. The power density of the microwave radiation

 

 

 

 

 

 

 

 

 

leakage emitted by the microwave oven should not

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

exceed 1mW/cm.sq. And always start measuring of an

 

 

 

 

 

 

 

 

 

unknown field to assure safety for operating personnel

 

 

 

 

 

 

 

 

Figure 7

from radiation leakage.

 

 

 

 

 

 

 

 

NOTE: The standard is 5mW/cm.sq. while in the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

customer’s home. 1mW/cm.sq. stated here is

C. MEASUREMENT WITH THE OUTER CASE REMOVED

manufacturer’s own voluntary standard for units in

customer’s home.

(1) When you replace the magnetron, measure for

 

 

microwave energy leakage before the outer case is

EQUIPMENT

installed and after all necessary components are

• Electromagnetic energy leakage monitor (NARDA 8100B,

replaced or adjusted. Special care should be taken in

HOLADAY HI 1501)

measuring the following parts.

• 600cc glass beaker

- Around the magnetron

• Glass thermometer 100°C

- The waveguide

 

 

WARNING: AVOID CONTACTING ANY HIGH VOLTAGE

 

 

 

 

 

PARTS.

Figure 6

-11-

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Image 12
Whirlpool 721.663398 Procedure for Measuring Microwave Energy Leakage, Measurement with the Outer Case Removed, Equipment
Page 11 Page 13

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