On Sun, 25 Jun 2017 19:50:39 +0100, Graham. wrote:

On Sun, 25 Jun 2017 16:03:00 +0100, "James Wilkinson Sword"
wrote:

My microwave turns off the magnetron 15 seconds before the end of the timer. What's the reason for this?

Perhaps you are looking at the question the wrong way, and you should
be asking "Why does the cooling fan (and light) continue to run after
the magnetron turns off", that would of course be a sensible thing to
do.

Doesn't sound sensible to me. Once the cooking is done, the whole thing should shut off. And if it's going to blow steam out for a bit, it should still bleep to tell the user they can take the food.

You, as a manufacturer might also want to create the illusion that
these 15 seconds are included in the cooking indicated time

So the user is actually cooking the food for less time than they think? That's insane.

and not
tagged on afterwards as some users would correlate the fan noise with
the "nuclear death rays" inside.

Since the death rays switch off as soon as the door is opened, what's the problem? If I take the food out early, I just open the door, I don't press "cancel" first. I recently used my neighbour's oven when I was round there, and was surprised to find the damn thing came back on (empty) when I shut the door afterwards! I think it was one of those antique things with a mechanical dial.

Did you know that no microwave radiation is produced for the initial 3
seconds of the indicated cooking time, as it takes that long for the
magnetron to warm up?

3 seconds isn't much, but 15 is.

--
Why is there no Disneyland in China?
No one's tall enough to go on the good rides.