Measure microwave oven heating efeciency or effectiness
This is not a problem, but a test.
I ran across this test 25 or more years ago while experimenting with a Heath Kit microwave oven. The objective was to measure the temperature rise in a beaker of water to determine the heat rise over a period of time.
This experiiment placed about a liter of water in a glass jar larger than a liter size (1.25 liter, aprox). Measure the temperature before heating and after heating to determine the temperature rise over a measured time (before and after). There was a formula for this test and I have misplaced or lost it. I am trying to test the heating effeciency of one microwave over another. This would also alow measurements over time to determine if the microwave oven continues to produce the same power in the future to decide if it is time to replace the oven. If you could find this formula or come up with a new one, I would be very appreciative.
Many Thanks! John Q. Adams, firstname.lastname@example.org
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If you tested the high voltage diode and capacitor it would leave the magnetron as the last line of defence to test. "warning unplug microwave" unhook one side of the magnetron, set meter to ohms, good reading less than 1ohm, if no reading the magnetron is bad, but keep in mind the magnetron can still be bad if there is a shorted turn which the meter cannot detect.
If you measure the temperature of 1/2 litre of tap water. Place it in the oven and heat on full power for 1 minute. Take it out and measure the temperature again. If the difference is 10 degrees Celcius or more difference the magnetron is healthy if not, it is low emmission and must be treated as a lower output machine.
following test will provide a suitably accurate measurement of the
output power of any microwave oven. Variations or errors in performing
this test will produce uncertain results. If the line voltage (from the
electrical outlet) is low, the magnetron output will be correspondingly
- Microwave safe container with 1000 mL (1 Liter) gradation.
- Fahrenheit or centigrade thermometer
exactly 1000 mL (1 Liter) of cool tap water into the container. Using
the thermometer, stir the water, then measure and record the
temperature. For accurate results the water should be about 60 degrees
F (20 degrees C).
Place the container on the center of the
oven cooking shelf (do not leave the thermometer in the container and
remove any metal racks), and heat the water (at full power) for 63
seconds. Use the second hand of a watch, not the oven timer.
the heating time is completed, immediately remove the container, stir
the water, re-measure and record the temperature of the heated water.
Subtract the starting water temperature (step 2) from the ending water temperature (step 3) to obtain the temperature rise.
determine the output power in watts, multiply the total temperature
rise by a factor of 38.75 if you're using a Fahrenheit thermometer or
by 70 if you're using a centigrade thermometer.
2) If it's not hidden either behind the
grille or control panel, they may have left it out as a cost-savings measure.
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hey! you told that everything working in your microwave oven! inside the microwave oven! transformer only producing heat! that transformer only fault in your oven! try to repair or change the transformer!!!!!!!
just aquired one just like it for free. they said no heat. took the outer cover off. about 12 screws. pull the main fuse and test it with a continuity tester.thats probably not it if the lights work. its either the magnatron (toshiba 2m248j(gs) or replacement part amana 8205460. mine was a coroded magnatron connection.unplugged it and pluged it back in. heats fine now. if you left it on with nothing in it for any length of time you blew the magnetron. universal magnatron replacements on ebay are $25. 4 screws and a 2 prong connector.
Make sure unit is not plugged in. Use a Volt-Ohm Meter, on Ohms setting, and see if you have connection to the fuse holder. Put one meter lead on the BLACK ac wire, test the ac plug with the other lead (both sides) One should read. Do the same with the WHITE ac wire. One should read.If you get readings on both sides then AC Cord is good. Next check the fuse holder for signs of heat or dis-coloration. If found replace fuse holder. Always remember just because a fuse looks good does not mean it is good, and also I have replaced a fuse with a NEW bad fuse. It happens. To be sure test with meter.