Originally Posted by
BARRY ADAIR
Warranty co. says, "Inspector's 1 minute test along with a light tester is inferior and should be tested on high for 2 1/2 minutes this should boil water 212°F in most units."
Unit in question will only get to 200°F by their own time and test,
"but that is close enough" they say.
Their 'standard' is likely for their 'new' units. That may be how they selectively test their units heating capability off the assembly line. Not real scientific like the QA tests I did at a defense plant I worked at for 5 years after high school, but, then, this is not trying to guide airplanes at 500 mph at 50 above the ground either
. Their test will demonstrate that the 'unit is working to their specification', presuming that is representative of their specification, of course.
Now, to the link you provided:
"Keep in mind that it’s normal for a microwave to produce less energy as it ages (hmmm… sounds familiar somehow!), but your results should be within about 50-75 watts of the rating."
I'd guess that the 12 degrees difference is within or close to that "50-75 watts of the rating".
By the way, the stuff I worked on was with microwaves, only very few of our tubes were in that low wattage range. We even had a few in the <1 watt (rated in mW) range, but most were in the kW to MW range (some I tested were over 5 mega watts). Nonetheless, though, there is a reduction in power over time (aging effect) as stated in your link.