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Power Test
To avoid risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitor
before servicing, unless testing requires power.
All microwave oven power outputs are rated using the IEC705 standards. Using the IEC705 test method requires
precision measurements and equipment that is not practical to be performed in the field. Using the test shown below
will indicate if the oven performance is satisfactory.
Test equipment required:
1000 ml test container and thermometer
•
Digital watch / watch with a second hand for use on ovens with electromechanical timers.
•
Important Notes:
Low line voltage will cause low temperature rise / power output.
•
•
Ovens must be on a dedicated circuit, properly grounded, and polarized. Other equipment on the same
circuit may cause a low temperature rise / power output.
•
This test and results are not a true IEC705 test procedures and are only intended to provide servicers with
an easy means of determining if the microwave oven cooking output is correct.
Procedure
1. Fill the test container to the 1000 ml line with cool tap water.
NOTE:
Water temperature should be approximately 60°F / 16°C
2. Using the thermometer, stir water for five to ten seconds; measure, and record the temperature (T1).
3. Place test container of water in the center of oven cavity and close door.
4. Heat the water for a 33-second full power cycle.
NOTE:
Use a digital watch or a watch with a second hand for ovens with electromechanical timers.
5. At end of the cycle, remove test container. Using the thermometer, stir water for five to ten seconds and record
temperature (T2).
6. Subtract the starting water temperature (T1) from the ending water temperature (T2) to obtain the temperature
rise ( T).
7. If the temperature rise ( T) meets or exceeds the minimum, the test is complete. If the temperature rise ( T)
fails to meet the minimum temperature rise, test the line voltage to verify it is correct. Then repeat steps 1 - 6
making sure to change the water. If the temperature rise ( T) fails to meet the minimum temperature rise again
the oven will require service.
Minimum Temperature Rise at Thirty -Three (33) Seconds Run Time
T
Cooking
(°F)
Power Output
10 ................. 1000
11 ................. 1100
12 ................. 1200
14 ................. 1400
17 ................. 1700
18 ................. 1800
19 ................. 1900
16500021
!
WARNING
T
Cooking
(°F)
Power Output
20 ................. 2000
21 ................. 2100
22 ................. 2200
24 ................. 2400
25 ................. 2500
27 ................. 2700
30 ................. 3000
4
T
Cooking
(°C)
Power Output
5 .............. 1000
5.5 ............ 1100
6.5 ............ 1200
7.5 ............ 1400
9.5 ............ 1700
10 ............. 1800
10.5 .......... 1900
T
Cooking
(°C)
Power Output
11 ............ 2000
11.5 ......... 2100
12 ............ 2200
13 ............ 2400
13.5 ......... 2500
15 ............ 2700
16.5 ......... 3000
October 2012
©2012 ACP Inc.
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