R-653. Text - Sharp Home Appliance Service Manual (repair manual). Page 5

5

R-653M -

MICROWAVE OUTPUT POWER

The power output of this oven is rated using the method specified by IEC-60705.
Full details of how to carry out thisprocedure can be found in the Sharp Technical Training notes which is
available 

     from Sharp Parts Centre (part number SERV-LITMW01).

These requirements make the procedure unsuitable for routine performance checks.

Note:

The following test method gives an indication of the output power only, it cannot be used to establish
the actual/rated output power.  If the true output power is required, then the IEC-60705 test method
must be used.

Alternative simplified method:
1. Place 2 litres of cold water (between 12

°

C and 20

°

C) in a suitable container.

2. Stir the water and measure the temperature in 

°

C.  Note temperature as T1.

3. Place the container in the microwave and heat the water for 2 minutes on full power.
4. When the 2 minutes is completed, remove the container and stir the water.  Note the water temperature as T2.
5. Calculate the output power using the following formula:

R.F. Power Output = (T2 - T1) x 70.

MICROWAVE LEAKAGE TEST

This oven should be tested for microwave leakage on completion of any repair or adjustment, following the
procedure described in the Sharp Technical Training notes (part number SERV-LITMW01).  The maximum
leakage permitted in BS EN 60335-2-25 is 50W/m

2 

(equivalent to 5mW/cm

2

), however it is not normal to

detect any significant leakage, therefore, any leakage which is detected should be investigated.

It is essential that only leakage detectors with current calibration traceable to the National Physical Laboratories
are used.

Suitable leakage detectors :

CELTEC A100
APOLLO X1