:shock::D:D:D;-) At least you didn’t say friend! 
Testing the oven - the water heating test
The precise number of degrees a known quantity of water increases in
temperature for a known time and power level is a very accurate test of
the actual useful microwave power. A couple of minutes with a cup of
water and a thermometer will conclusively determine if your microwave
oven is weak or you are just less patient (or the manufacturer of your
frozen dinners has increased their weight - sure, fat chance of that!)
You can skip the heavy math below and jump right to the final result
if you like. However, for those who are interested:
- 1 Calorie © will raise the temperature of 1 gram (g) of liquid water
exactly 1 degree Centigrade (DegC) or 9/5 degree Fahrenheit (DegF). - 1 Calorie is equal to 4.184 Joules (J) or 1 J = .239 C.
- 1 Watt (W) of power is 1 J/s or 1 KW is 1000 J/s.
- 1 cup is 8 ounces (oz) which is 8 x 28.35 g/oz = 226.8 g.
- 1 minute equals 60 s (but you know this!).
Therefore, in one minute, a 1 KW microwave oven will raise the temperature
of 1 cup of water by:
T(rise) = (60 s * 1000 J/s * .239C/J * (g * DegC)/C)/(226.8 g) = 63 DegC.
Or, if your prefer Fahrenheit: 114 DegF.
To account for estimated losses due to conduction, convection, and imperfect
power transfer, I suggest using temperature rises of 60 DegC and 109 DegF.
Therefore, a very simple test is to place a measured cup of water in the
microwave from the tap and measure its temperature before and after heating
for exactly 1 minute on HIGH. Scale the expected temperature rise by the
ratio of the microwave (not AC line) power of your oven compared to a 1 KW
unit.
Or, from a Litton microwave handbook:
Heat one Liter (L) of water on HIGH for 1 minute.
Oven power = temperature rise in DegC multiplied by 70.
Use a plastic container rather than a glass one to minimize the needed
energy loss to raise its temperature by conduction from the hot water.
There will be some losses due to convection but this should not be that
significant for these short tests.
(Note: if the water is boiling when it comes out - at 100 DegC or 212 DegF,
then the test is invalid - use colder water or a shorter time.)
The intermediate power levels can be tested as well. The heating effect of
a microwave oven is nearly linear. Thus, a cup of water should take nearly
roughly twice as long to heat a specific number of degrees on 50% power or
3.3 times as long on 30% power as on full power. However, for low power
tests, increasing the time to 2 minutes with 2 cups of water will result
in more accurate measurements due to the long period pulse width power
control use by microwave ovens which may have a cycle of up to 30 seconds.
Any significant discrepancy between your measurements and the specified
microwave power levels - say more than 10 % on HIGH - may indicate a problem.
(Due to conduction and convection losses as well as the time required to
heat the filament of the magnetron for each on-cycle, the accuracies of
the intermediate power level measurements may be slightly lower).
is picocuries the right unit? a curie is a measure of radioactive decay.
i got two of them from you so far and like the faint popcorn smell.
Works great.
Takes only 15 sec to get warm.
The above needs to not leave the bag in so long.
Can we still get tribbles? Been a little cold. I bet they feel good in your pockets.
tom
That is what I use also. 
And Barry, why do you care what some fly by night warranty company will cover???
I don’t think Barry will be responding.